CN115044856B - Preparation method of abrasion self-repairing sealing coating - Google Patents
Preparation method of abrasion self-repairing sealing coating Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 158
- 239000011248 coating agent Substances 0.000 title claims abstract description 150
- 238000007789 sealing Methods 0.000 title claims abstract description 96
- 238000005299 abrasion Methods 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 136
- 238000000034 method Methods 0.000 claims abstract description 58
- 239000002131 composite material Substances 0.000 claims abstract description 49
- 239000000463 material Substances 0.000 claims abstract description 45
- 229910052604 silicate mineral Inorganic materials 0.000 claims abstract description 37
- 229910052751 metal Inorganic materials 0.000 claims abstract description 33
- 239000002184 metal Substances 0.000 claims abstract description 33
- 230000008569 process Effects 0.000 claims abstract description 29
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 238000010285 flame spraying Methods 0.000 claims abstract description 10
- 238000005507 spraying Methods 0.000 claims description 60
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 36
- 239000007789 gas Substances 0.000 claims description 22
- 239000010410 layer Substances 0.000 claims description 22
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 18
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 claims description 18
- 229910052760 oxygen Inorganic materials 0.000 claims description 18
- 239000001301 oxygen Substances 0.000 claims description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 17
- 229960000892 attapulgite Drugs 0.000 claims description 17
- 229910052625 palygorskite Inorganic materials 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 15
- 230000003179 granulation Effects 0.000 claims description 14
- 238000005469 granulation Methods 0.000 claims description 14
- 239000000112 cooling gas Substances 0.000 claims description 13
- 239000004576 sand Substances 0.000 claims description 13
- 239000000758 substrate Substances 0.000 claims description 13
- 239000007921 spray Substances 0.000 claims description 11
- 238000007664 blowing Methods 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 10
- 229910052759 nickel Inorganic materials 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 9
- 239000012790 adhesive layer Substances 0.000 claims description 8
- 239000011230 binding agent Substances 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 239000002609 medium Substances 0.000 claims description 7
- 229910000943 NiAl Inorganic materials 0.000 claims description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 6
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000002612 dispersion medium Substances 0.000 claims description 4
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 7
- 239000011159 matrix material Substances 0.000 abstract description 7
- 238000003754 machining Methods 0.000 abstract description 6
- -1 agglomerating Substances 0.000 abstract description 3
- 238000001465 metallisation Methods 0.000 abstract description 2
- 238000000151 deposition Methods 0.000 abstract 1
- 230000009977 dual effect Effects 0.000 description 20
- 229910000831 Steel Inorganic materials 0.000 description 19
- 239000010959 steel Substances 0.000 description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 15
- 239000010439 graphite Substances 0.000 description 15
- 229910002804 graphite Inorganic materials 0.000 description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 13
- 238000000227 grinding Methods 0.000 description 11
- 238000001514 detection method Methods 0.000 description 10
- 229910052500 inorganic mineral Inorganic materials 0.000 description 10
- 239000011707 mineral Substances 0.000 description 10
- 238000005488 sandblasting Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000003628 erosive effect Effects 0.000 description 5
- 238000007788 roughening Methods 0.000 description 5
- 229910052582 BN Inorganic materials 0.000 description 4
- 244000137852 Petrea volubilis Species 0.000 description 4
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 4
- 238000005422 blasting Methods 0.000 description 4
- 229910052593 corundum Inorganic materials 0.000 description 4
- 239000010431 corundum Substances 0.000 description 4
- 238000005238 degreasing Methods 0.000 description 4
- 235000019441 ethanol Nutrition 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 229920000742 Cotton Polymers 0.000 description 3
- 238000000498 ball milling Methods 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 229920006389 polyphenyl polymer Polymers 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000007751 thermal spraying Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- 238000002679 ablation Methods 0.000 description 2
- FDTGUDJKAXJXLL-UHFFFAOYSA-N acetylene Chemical compound C#C.C#C FDTGUDJKAXJXLL-UHFFFAOYSA-N 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 238000001694 spray drying Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- 238000007550 Rockwell hardness test Methods 0.000 description 1
- LNSPFAOULBTYBI-UHFFFAOYSA-N [O].C#C Chemical group [O].C#C LNSPFAOULBTYBI-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002925 chemical effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 229910052909 inorganic silicate Inorganic materials 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/007—Alloys based on nickel or cobalt with a light metal (alkali metal Li, Na, K, Rb, Cs; earth alkali metal Be, Mg, Ca, Sr, Ba, Al Ga, Ge, Ti) or B, Si, Zr, Hf, Sc, Y, lanthanides, actinides, as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Coating By Spraying Or Casting (AREA)
- Sealing Material Composition (AREA)
- Paints Or Removers (AREA)
Abstract
The invention provides a preparation method of a wear self-repairing sealing coating, which comprises the following steps: mixing silicate mineral powder with superfine metal powder, agglomerating, coating and granulating, and mechanically mixing with sealing coating powder according to a certain proportion; depositing the prepared composite powder on the surface of a metal matrix by adopting a flame spraying process to obtain a composite coating; and (3) machining the composite coating to meet the assembly and use requirements of the coating. According to the invention, the self-repairing pre-powder preparation technology is adopted to realize the metallization of the self-repairing components, so that the stable control of the components of the forming process is facilitated; the introduction of proper silicate mineral components can reduce the friction coefficient of the sealing coating and effectively delay the abrasion degree of the friction pair, thereby improving the sealing performance of the sealing coating; the technical process route has simple steps, simple operation, convenient processing and implementation and low economic cost; the method is suitable for various sealing coating or sealing coating material systems and related application scenes, and has good industrial application prospect.
Description
Technical Field
The invention belongs to the technical field of material surface modification and coating preparation, and particularly relates to a preparation method of a wear self-repairing sealing coating, which belongs to the technical field of surface engineering and remanufacturing, and can be applied to the preparation of a mechanical sealing surface coating, so that a sealing fit clearance is effectively reduced, and the sealing performance, reliability and service life of parts are improved.
Background
The abradable seal coating is prepared on the sealing matching surface of the mechanical part by adopting a thermal spraying technology, and the abradable seal coating has good abradability and lower friction coefficient, can realize self-matching compensation of a sealing gap by self abrasion through the friction scraping effect between friction pairs of the sealing matching surface, thereby effectively reducing the sealing matching gap, improving the sealing reliability and the equipment operation efficiency, and is widely applied in the field of rotary mechanical sealing. As one of key materials of the aeroengine, the sealing coating can effectively improve the tightness between the rotating part and the fixed part in the gas turbine, and obviously improve the thermal efficiency and the flight safety of the engine.
The existing sealing coating material system mainly comprises a metal-based self-abrasion coating material and is generally composed of two components of metal and nonmetal, wherein the metal components mainly comprise Ni-based and Al-based metal materials and are used for ensuring the bonding capability of the coating; the nonmetallic components are nonmetallic materials with good solid lubricating property and self-abrasion property, such as graphite, diatomite, hexagonal boron nitride, polyphenyl ester and the like. The ideal sealing coating is ensured not to fall off and to be scraped in the working process, and has lower friction coefficient, excellent thermal shock resistance and good adhesion performance with a matrix; at the same time, sufficient strength should be provided to resist erosion by foreign particles and air flow without damaging the workpiece when in frictional contact with the rotating member.
Seal coating failure is typically due to seal coating over time causing increased seal clearance or damage to the coated surface and the grinding rotor due to foreign material entering into the abrasive particles, resulting in overall failure of the seal system. For example, the Ni/C coating is mainly used for improving the sealing performance between stator parts and rotor parts of an aeroengine, has the advantages of mature material preparation process and low cost, can obtain lower coating friction coefficient by adjusting the graphite content in the Ni/C coating, but has reduced mechanical strength along with the increase of the graphite content, and has reduced performance of resisting external particles and airflow scouring, thereby influencing the service life of the coating and limiting the application range thereof. Therefore, how to improve the mechanical properties of the sealing coating, improve the abrasion resistance and erosion resistance of the sealing coating, and simultaneously maintain the characteristics of low friction, abradability and no damage to the polished part is a problem in the field.
Disclosure of Invention
In view of the above, the invention aims to provide a preparation method of a self-repairing seal coating for abrasion, wherein the layered silicate mineral component is introduced into a seal coating powder material, and the seal coating material for delaying the abrasion of the surface of a seal friction pair is prepared by a thermal spraying method, so that the reliability of a mechanical seal device is effectively ensured, the sealing performance is improved, and the service life is prolonged.
The invention provides a preparation method of a wear self-repairing sealing coating, which comprises the following steps:
carrying out composite granulation on silicate mineral powder and metal powder to obtain self-repairing pre-powder;
mixing the self-repairing pre-powder and the sealing coating powder to obtain composite powder;
and spraying the composite powder to obtain the abrasion self-repairing sealing coating.
Preferably, the silicate mineral powder is a layered silicate mineral powder;
the particle size of the silicate mineral powder is 2-5 mu m;
the silicate mineral powder is one or more selected from attapulgite and serpentine.
Preferably, the particle size of the metal powder is less than or equal to 500 meshes;
the metal powder is selected from aluminum-based and/or nickel-based metal powder.
Preferably, the mass of the silicate mineral powder is 5-50% of the mass of the metal powder.
Preferably, the method for composite granulation comprises:
dispersing and mixing metal powder, silicate mineral powder, a dispersing medium and a binder to obtain composite powder slurry;
and carrying out spray granulation and drying on the composite powder slurry to obtain the self-repairing pre-powder.
Preferably, the dispersion medium is ethanol;
the binder is polyvinyl alcohol.
Preferably, the granularity of the self-repairing pre-powder is 100-200 meshes;
the granularity of the sealing coating powder is 100-200 meshes.
Preferably, the spraying is flame spraying;
the spraying method comprises the following steps:
and (3) sequentially carrying out surface cleaning, surface sand blowing, adhesive layer spraying and composite powder spraying on the substrate.
Preferably, the bonding layer material used in the bonding layer spraying process is selected from NiAl-based and/or MCrAlY-based materials, and M is selected from Fe, ni and/or Co;
the working gas in the process of spraying the bonding layer comprises the following components: oxygen and acetylene;
the flow rate of the oxygen is 1.2-1.4 m 3 And/h, wherein the pressure of the oxygen is 0.6-1.0 MPa;
the flow of the acetylene is 1.3-1.5 m 3 And/h, wherein the pressure of acetylene is 0.1-0.2 MPa;
the cooling gas is compressed air, and the pressure of the compressed air is 0.3-0.7 MPa;
the spraying distance is 200-300 mm;
the spraying thickness is 0.1-0.2 mm.
Preferably, the spraying distance in the process of spraying the composite powder is 160-220 mm;
the working gas includes: oxygen and acetylene;
the flow rate of the oxygen is 1.2-1.4 m 3 And/h, wherein the pressure of the oxygen is 0.6-1.0 MPa;
the flow of the acetylene is 1.3-1.5 m 3 And/h, wherein the pressure of acetylene is 0.1-0.2 MPa;
the cooling gas is compressed air, and the pressure of the compressed air is 0.3-0.7 MPa;
the spraying thickness is 0.5-1 mm.
According to the invention, the layered silicate mineral component is added into the sealing coating material, so that the friction coefficient of the coating can be obviously reduced under the condition of not changing the hardness, abradability and strength of the original sealing coating, and the surface state of the dual friction piece is ensured not to be damaged, thereby improving the sealing performance and reliability of the system and reducing the energy consumption of the system. The self-repairing sealing coating prepared by the invention can provide self-repairing components for the dual friction piece when the self-repairing sealing coating is worn, and induce the friction chemical reaction between the dual friction piece material and silicate minerals, thereby realizing the self-repairing and performance strengthening of the friction surface damage of the dual friction piece, effectively improving the wear resistance and erosion resistance of the dual friction piece, and improving the sealing performance and the service life of the system. The preparation technical process route of the self-repairing sealing coating provided by the invention is consistent with the preparation technical process route of the sealing coating, silicate mineral components are added into commercial sealing coating materials in the form of self-repairing prefabricated powder, flexible regulation and control of the self-repairing components in the coating can be realized, and the composite preparation process of the self-repairing components and the sealing coating materials is simple. The method provided by the invention is suitable for various sealing coating or sealing coating material systems and related application scenes, and has good industrial application prospect.
Drawings
FIG. 1 is a high-power scanning electron microscope photograph of an attapulgite pre-powder prepared in example 1 of the present invention;
FIG. 2 is a high magnification scanning electron micrograph of the surface of the seal coat prepared in comparative example 1 of the present invention;
FIG. 3 is a high power scanning electron microscope photograph of the surface of the self-repairing seal coating prepared in example 1 of the present invention;
FIG. 4 is a graph showing the friction coefficient of the coatings prepared in example 1 and comparative example 1 according to the present invention;
FIG. 5 is a high-power scanning electron microscope photograph of the morphology of the grinding steel ball of the coating prepared in comparative example 1;
FIG. 6 is a high-power scanning electron microscope photograph of the morphology of the grinding steel ball grinding mark of the self-repairing seal coating prepared in the embodiment 1 of the invention.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a preparation method of a wear self-repairing sealing coating, which comprises the following steps:
carrying out composite granulation on silicate mineral powder and metal powder to obtain self-repairing pre-powder;
mixing the self-repairing pre-powder and the sealing coating powder to obtain composite powder;
and spraying the composite powder to obtain the abrasion self-repairing sealing coating.
The inorganic silicate mineral has great difference with the sealing coating material in physical and chemical properties, and the silicate mineral and the sealing coating material are simply mixed mechanically for spraying, so that the splashing and ablation of silicate mineral components are easy to cause, the mineral components cannot be deposited in the coating, and the spraying preparation process is not easy to realize. The invention provides a metallization technology of silicate mineral components, which is characterized in that a layer of metal particles are coated on the surface of the mineral components through agglomeration and granulation of the mineral components and superfine metal powder, so that the spray coating process is more beneficial to the physicochemical properties of the mineral components, the stability of the mineral components is ensured, and the problems of ablation, decomposition and the like caused in the spray coating process are effectively prevented.
In the present invention, the silicate mineral powder is preferably a layered silicate mineral powder; the particle diameter of the silicate mineral powder is preferably 2 to 5 μm, more preferably 3 to 4 μm; the silicate mineral powder is preferably selected from one or more of attapulgite and serpentine.
In the invention, the main function of the layered silicate mineral component is that in the friction process of a rubbing part (such as a dual friction part of an aeroengine blade tip and the like) and a sealing coating, the friction surface of a friction pair is subjected to chemical reaction under the action of a friction chemical effect and mechanical shearing force to form an antifriction and antiwear self-repairing layer with a nano structure, so that the abrasion degree of the friction pair is delayed, the increase of the clearance between the friction pair and the sealing coating is effectively controlled, and the sealing reliability is improved.
In the present invention, the metal powder is preferably ultrafine metal powder; the particle size of the metal powder is preferably not less than 500 mesh, more preferably 500 to 800 mesh, and most preferably 600 to 700 mesh.
In the invention, the metal powder is preferably aluminum-based and/or nickel-based metal powder, the aluminum-based metal powder is preferably pure aluminum powder and/or aluminum alloy powder, and the Al content in the aluminum alloy powder is preferably more than 90%; the nickel-based metal powder is preferably pure nickel powder and/or nickel alloy powder, and the Ni content in the nickel alloy powder is preferably more than 90%.
In the present invention, the mass of the silicate mineral powder is preferably 5 to 50% of the mass of the metal powder, more preferably 30 to 40%, and most preferably 35%.
In the present invention, the method of composite granulation preferably comprises:
dispersing and mixing metal powder, silicate mineral powder, a dispersing medium and a binder to obtain composite powder slurry;
and carrying out spray granulation and drying on the composite powder slurry to obtain the self-repairing pre-powder.
In the present invention, the dispersion medium is preferably ethanol, more preferably absolute ethanol; the binder is preferably polyvinyl alcohol (PVA).
In the present invention, the mass ratio of the metal powder, the dispersion medium and the binder is preferably (20 to 40): (52-78): 2-8, more preferably (25-35): (55-75): 3-7, more preferably (28-32): (60-70): (4-6), most preferably 30:65:5.
In the present invention, the method of dispersion mixing is preferably ball milling; the ball milling is preferably carried out in a planetary ball mill or a three-roll mixer.
In the present invention, the spray granulation is preferably performed in a spray drying apparatus; the air inlet temperature in the spray granulation process is preferably 180-270 ℃, more preferably 200-250 ℃, and most preferably 220-230 ℃; the temperature of the air outlet is preferably 80-150 ℃, more preferably 100-130 ℃ and most preferably 110-120 ℃; the frequency of the atomizing disk is preferably 210-300 Hz, more preferably 230-270 Hz, and most preferably 250Hz; and obtaining spherical agglomerated powder after spray drying.
In the present invention, the drying temperature is preferably 300 to 350 ℃, more preferably 310 to 340 ℃, and most preferably 320 to 330 ℃; the drying time is preferably 2 to 4 hours, more preferably 3 hours.
In the invention, the self-repairing pre-powder with the target granularity of 100-200 meshes is obtained by preferably sieving after drying; the particle size of the self-repairing pre-powder is preferably 100 to 200 mesh, more preferably 130 to 170 mesh, and most preferably 150 mesh.
In the present invention, the particle size of the seal coat powder is preferably 100 to 200 mesh, more preferably 130 to 170 mesh, and most preferably 150 mesh.
In the present invention, the seal coat powder is preferably selected from one or more of metal-based self-abrasion materials such as nickel graphite, aluminum silicon polystyrene, aluminum silicon graphite, and aluminum silicon boron nitride; the mass content of graphite in the nickel graphite is preferably 20-50%, more preferably 30-40%, and most preferably 35%; the mass content of the polyphenyl ester in the aluminum-silicon polyphenyl ester is preferably 20-50%, more preferably 30-40%, and most preferably 35%; the mass content of graphite in the aluminum silicon graphite is preferably 20-50%, more preferably 30-40%, and most preferably 35%; the mass content of boron nitride in the aluminum silicon boron nitride is preferably 20 to 50%, more preferably 30 to 40%, and most preferably 35%.
The source of the sealing coating powder is not particularly limited, and the sealing coating powder can be purchased from the market.
In the invention, the mass ratio of the self-repairing pre-powder to the sealing coating powder is preferably (1-5): 45-49, more preferably (2-4): 46-48, and most preferably 3:47.
In the present invention, the compounding is preferably performed in a rocker arm blender; the mixing time is preferably 20 to 30 hours, more preferably 22 to 28 hours, and most preferably 24 to 26 hours.
In the invention, the composite powder is preferably sprayed on the surface of the substrate, so that the composite powder is deposited on the substrate to obtain the abrasion self-repairing sealing coating.
In the present invention, the spraying method is preferably flame spraying; the spraying method preferably comprises the following steps:
and (3) sequentially carrying out surface cleaning, surface sand blowing, adhesive layer spraying and composite powder spraying on the substrate.
In the present invention, the substrate is preferably a 45# steel plate; the components of the matrix are preferably:
C：0.42～0.50wt％；
Si：0.17～0.37wt％；
Mn：0.50～0.80wt％；
P：≤0.035wt％；
S：≤0.035wt％；
Cr：≤0.25wt％；
Ni：≤0.35wt％；
Cu：≤0.25wt％；
the balance being Fe.
In the present invention, the method of surface cleaning preferably comprises:
and (3) dipping alcohol or acetone into absorbent cotton or a brush to scrub the surface of the substrate, and removing greasy dirt on the surface of the substrate.
In the present invention, the surface is preferably further comprising after scrubbing:
and cleaning the scrubbed surface.
In the present invention, the method of cleaning is preferably ultrasonic cleaning; the time for the washing is preferably 5 to 15 minutes, more preferably 10 minutes; the medium for washing is preferably ethanol, more preferably absolute ethanol.
In the present invention, the surface sand blasting method preferably includes:
and (3) carrying out sand blowing treatment on the surface of the cleaned substrate by adopting a jet type sand blowing machine, removing oxide skin on the surface of the substrate, blowing off surface floating ash by using compressed air after the completion of sand blowing, checking that the surface of the sand blowing is uniform and has no metallic luster, prohibiting the contact of hands on the surface after sand blowing, and avoiding pollution caused by unclean working position devices and the like.
In the invention, the surface sand blasting is preferably roughening treatment by adopting gas sand blasting; the material of the gas sand blasting is preferably white corundum sand; the granularity of the white corundum sand is preferably 50-200 meshes, more preferably 100-150 meshes; the working gas pressure in the gas blasting process is preferably 0.3-0.5 MPa, more preferably 0.4MPa; the blasting distance is preferably 100 to 150mm, more preferably 110 to 140mm, and most preferably 120 to 130mm.
In the present invention, the bonding layer material used in the bonding layer spraying process is preferably selected from the group consisting of NiAl-based and/or MCrAlY-based materials, and M is selected from the group consisting of Fe, ni, and/or Co. The source of the adhesive layer material is not particularly limited and can be purchased from the market.
In the invention, the substrate after sand blowing is preferably preheated to 100-200 ℃, more preferably 130-170 ℃ and most preferably 150 ℃ in the process of spraying the bonding layer; the working gas in the process of spraying the bonding layer preferably comprises: oxygen and acetylene; the flow rate of the oxygen is preferably 1.2-1.4 m 3 Preferably 1.3m 3 /h; the pressure of the oxygen is preferably 0.6 to 1.0MPa, more preferably 0.7 to 0.9MPa, and most preferably 0.8MPa; the flow rate of the acetylene is preferably 1.3-1.5 m 3 /h, more preferably 1.4m 3 /h; the pressure of the acetylene is preferably 0.1 to 0.2MPa, more preferably 0.13 to 0.17MPa, and most preferably 0.15MPa; the cooling gas is preferably compressed air; the pressure of the compressed air is preferably 0.3 to 0.7MPa, more preferably 0.4 to 0.6MPa, and most preferably 0.5MPa; the spraying distance is preferably 200 to 300mm, more preferably 230 to 270mm, most preferably 250mm; the spraying thickness is preferably 0.1 to the whole0.2mm, more preferably 0.13 to 0.17mm, most preferably 0.15mm.
In the present invention, the thickness of the adhesive layer obtained after the adhesive layer is sprayed is preferably 0.1 to 0.2mm, more preferably 0.13 to 0.17mm, and most preferably 0.15mm.
In the invention, the spraying distance in the process of spraying the composite powder is preferably 160-220 mm, more preferably 170-210 mm, more preferably 180-200 mm, and most preferably 190mm; the working gas preferably comprises: oxygen and acetylene; the flow rate of the oxygen is preferably 1.2-1.4 m 3 Preferably 1.3m 3 /h; the pressure of the oxygen is preferably 0.6 to 1.0MPa, more preferably 0.7 to 0.9MPa, and most preferably 0.8MPa; the flow rate of the acetylene is preferably 1.3-1.5 m 3 /h, more preferably 1.4m 3 /h; the pressure of the acetylene is preferably 0.1 to 0.2MPa, more preferably 0.13 to 0.17MPa, and most preferably 0.15MPa; the cooling gas is preferably compressed air; the pressure of the compressed air is preferably 0.3 to 0.7MPa, more preferably 0.4 to 0.6MPa, and most preferably 0.5MPa; the thickness of the spray coating is preferably 0.5 to 1mm, more preferably 0.5 to 0.8mm, and most preferably 0.7mm.
In the present invention, the thickness of the coating layer during the spraying of the composite powder is preferably 0.5 to 1mm, more preferably 0.6 to 0.9mm, and most preferably 0.7 to 0.8mm.
In the present invention, the spraying composite powder preferably further comprises:
and machining the obtained composite coating to meet the assembly and use requirements of the coating.
In the present invention, the method of machining is preferably a polishing treatment; the polishing treatment is preferably performed by sand paper; the mesh number of the sand paper is preferably 800-1200 meshes, more preferably 1000 meshes; the surface roughness of the composite coating after machining is preferably 10 to 30 microns, more preferably 15 to 25 microns, and most preferably 20 microns.
According to the invention, the layered silicate mineral component is added into the sealing coating material, so that the friction coefficient of the coating can be obviously reduced under the condition of not changing the hardness, abradability and strength of the original sealing coating, and the surface state of the dual friction piece is ensured not to be damaged, thereby improving the sealing performance and reliability of the system and reducing the energy consumption of the system. The self-repairing sealing coating prepared by the invention can provide self-repairing components for the dual friction piece when the self-repairing sealing coating is worn, and induce the friction chemical reaction between the dual friction piece material and silicate minerals, thereby realizing the self-repairing and performance strengthening of the friction surface damage of the dual friction piece, effectively improving the wear resistance and erosion resistance of the dual friction piece, and improving the sealing performance and the service life of the system. The preparation technical process route of the self-repairing sealing coating provided by the invention is consistent with the preparation technical process route of the sealing coating, silicate mineral components are added into commercial sealing coating materials in the form of self-repairing prefabricated powder, flexible regulation and control of the self-repairing components in the coating can be realized, and the composite preparation process of the self-repairing components and the sealing coating materials is simple. The method provided by the invention is suitable for various sealing coating or sealing coating material systems and related application scenes, and has good industrial application prospect.
The invention will be further illustrated with reference to specific examples, but the invention is by no means limited to the examples.
Example 1
A45 # steel plate with the thickness of 100mm multiplied by 10mm is selected as a matrix, a composite sealing coating is prepared on the surface of the matrix, the sealing raw material is mixed powder of attapulgite pre-powder and Ni/C powder (nickel-coated graphite powder, the graphite content is 25 wt%) and the bonding layer is prepared from NiAl powder by common flame spraying with the processing method, and the thickness of the coating is 0.7mm.
The method comprises the following steps:
step 1: preparation of attapulgite prefabricated powder
Firstly, mixing superfine nickel powder (500-800 meshes) and attapulgite (2-5 microns) powder according to a mass ratio of 3:2, and then placing the mixture and a dispersing medium of absolute ethyl alcohol and a binder of polyvinyl alcohol (PVA) on a planetary ball mill according to a mass ratio of 7:12:1 for full ball milling, dispersing and uniformly mixing to prepare composite powder slurry;
and then carrying out spray granulation and drying on the composite powder slurry by using spray granulation drying equipment, and finally sieving the powder obtained by drying to obtain the attapulgite pre-powder with the target granularity in the range of 100-200 meshes.
Step 2: preparation of self-repairing sealing coating composite powder
Adding the prefabricated powder prepared in the step 1 into Ni/C powder (KF-21T nickel graphite composite powder with 100-200 meshes, wherein the mass content of graphite is 25%, and the balance is Ni, which is purchased from North Ore New Material technology Co., ltd.) according to the mass ratio of 4%, and placing the mixture on a rocker arm mixer to mix for 24 hours, and uniformly mixing for later use.
Step 3: pretreatment of spray surfaces, including degreasing and surface blasting roughening
Degreasing, namely removing greasy dirt on a surface to be processed, dipping cotton gauze in acetone to wipe the surface of a substrate, and then ultrasonically cleaning for 10min, wherein a cleaning medium is absolute ethyl alcohol.
Coarsening, namely coarsening a spraying machining surface by adopting gas sand blasting, wherein the sand blasting material is white corundum sand with 50-200 meshes, the working gas pressure is 0.45MPa, and the sand blasting distance is 120mm; and after roughening, the surface to be sprayed is qualified under the condition of no reflecting surface, so that 100% coverage of the roughened surface is realized.
Step 4: spraying adhesive layer
Adopting a common flame spraying technology, spraying a material NiAl (KF-2 nickel-coated aluminum powder, ni 80wt%, al20wt%, purchased from North Ore New Material technology Co., ltd.) powder, wherein the thickness of a spraying layer is 0.1mm, and the spraying distance is 260mm; the working gas and cooling gas parameters are as follows:
| gas name | Flow (m) 3 /h) | Pressure (MPa) | Remarks |
| Oxygen gas | 1.3 | 0.8 | |
| Acetylene (acetylene) | 1.4 | 0.15 | |
| Compressed air | -- | 0.5 | Cooling gas |
Step 5: spraying a working layer, namely spraying Ni/C-based self-repairing seal coating composite powder (composite powder prepared in the step 2) by adopting a common flame spraying technology, wherein the thickness of the spraying layer is 0.6mm, and the spraying distance is controlled to be 200mm; the working gas and cooling gas parameters are the same as above (consistent with the spray bond coat parameters).
Step 6: post-coating treatment
And (3) polishing the surface of the coating by adopting 1000-mesh sand paper, wherein the roughness Ra of the surface of the coating after the treatment is 10-30 microns.
The detection result of the high-power scanning electron microscope detection of the attapulgite pre-powder prepared in the embodiment 1 of the invention is shown in figure 1, and the particle size of the prepared pre-powder is about 50-80 microns, the pre-powder is in an ellipsoidal shape, the attapulgite mineral particles and Ni metal particles are clearly visible to be clustered together on the surface of the powder, and the two particles are uniformly distributed.
The surface of the self-repairing sealing coating prepared in the embodiment 1 of the invention is subjected to high-power scanning electron microscope detection, the detection result is shown in figure 3, and as shown in figure 3, the coating mainly consists of a light gray Ni metal phase and a black graphite phase, and the attapulgite phase is uniformly distributed in the Ni metal phase in a convex point shape, so that the method for preparing powder by adopting the invention is explained, and the mineral components of the attapulgite can be uniformly introduced into the coating by adopting a thermal spraying process, thereby realizing the antifriction self-repairing effect of the composite coating.
Example 2
A composite seal coating was prepared as in example 1, differing from example 1 in step 2: the prefabricated powder is added according to the mass content of 6% in the preparation process of the self-repairing sealing coating composite powder.
Example 3
A composite seal coating was prepared as in example 1, differing from example 1 in step 2: the prefabricated powder is added according to the mass content of 8% in the preparation process of the self-repairing sealing coating composite powder.
Comparative example 1
A45 # steel plate with the thickness of 100mm multiplied by 10mm is selected as a matrix, a sealing coating is prepared on the surface of the matrix, ni/C powder (nickel-coated graphite powder, the graphite content of 25 wt%) is selected as a sealing raw material, niAl powder is adopted as a raw material of a bonding layer, the common flame spraying is adopted in a processing method, and the thickness of the coating is 0.7mm.
The method comprises the following steps:
step 1: pretreatment of spray surfaces, including degreasing and surface blasting roughening
Degreasing, namely removing greasy dirt on a surface to be processed, dipping cotton gauze in acetone to wipe the surface of a substrate, and then ultrasonically cleaning for 10min, wherein a cleaning medium is absolute ethyl alcohol.
Coarsening, namely coarsening a spraying machining surface by adopting gas sand blasting, wherein the sand blasting material is white corundum sand with 50-200 meshes, the working gas pressure is 0.45MPa, and the sand blasting distance is 120mm; and after roughening, the surface to be sprayed is qualified under the condition of no reflecting surface, so that 100% coverage of the roughened surface is realized.
Step 2: spraying adhesive layer
Adopting an oxygen-acetylene flame spraying technology, spraying material NiAl powder (the components and sources are the same as those in the embodiment 1), wherein the thickness of a spraying layer is 0.1mm, and the spraying distance is controlled to be 260mm; the working gas and cooling gas parameters are as follows:
| gas name | Flow (m) 3 /h) | Pressure (MPa) | Remarks |
| Oxygen gas | 1.3 | 0.75 | |
| Acetylene (acetylene) | 1.4 | 0.15 | |
| Compressed air | -- | 0.5 | Cooling gas |
Step 3: spraying working layer
Adopting a common flame spraying technology to spray Ni/C powder (the source is the same as that of the embodiment 1), wherein the thickness of a spraying layer is 0.6mm, and the spraying distance is controlled to be 200mm; the working gas and the cooling gas have the same parameters as the working gas and the cooling gas (consistent with the sprayed bonding layer)
Step 4: post-coating treatment
And (3) polishing the surface of the coating by adopting 1000-mesh sand paper, wherein the roughness Ra of the surface of the coating after the treatment is 10-30 microns.
The surface of the sealing coating prepared in comparative example 1 is subjected to high-power scanning electron microscope detection, the detection result is shown in figure 2, and as can be seen from figure 2, the coating mainly consists of a light gray Ni metal phase and a black graphite phase, and the two phases are uniformly distributed; similar to the surface morphology of the composite coating in example 1, it was demonstrated that the pre-powder composition in example 1 did not significantly affect the overall morphology of the coating.
Performance detection
Rockwell hardness test of coating surface
Hardness tests are carried out on the coating surfaces prepared in the examples and the comparative examples, the Rockwell hardness of the coating surfaces is measured by a 600MRD/S digital display surface Rockwell hardness tester, an HR15Y scale is selected,the stainless steel press head is quenched, the load is 15Kg, the loading time is 5s, and the average hardness is taken as the average value of 3 measurement results.
The detection results are as follows:
the hardness of the HR15Y scale of the coatings prepared in the examples 1, 2 and 3 and the comparative example 1 is shown by the hardness values in the table, the addition of the attapulgite has a small influence on the hardness value of the coating, and the hardness value is one of key indexes for measuring the abradability of the dense coating, so that the abradability of the sealed coating is not adversely affected by the attapulgite.
Wear resistance test of coating and dual friction piece
The abrasion resistance of the prepared seal coating was tested by using an SRV-4 abrasion tester, and the abrasion resistance of the dual friction member was tested by dry friction at room temperature in the atmospheric environment: the test adopts a ball-disc contact reciprocating motion mode, wherein the surface of a reciprocating lower sample disc is a coating prepared in the examples and the comparative examples, and is fixed with an upper sample of the coating opposite grinding, the material is GCr steel ball, and the diameter is 10mm; the test load is 20N, the frequency is 10Hz, the reciprocating stroke is 1mm, and the test time is 2 hours; in the test process, the equipment automatically records the change of the friction coefficient along with time; after the test is finished, measuring the abrasion volumes of the coating and the opposite grinding steel ball by using a laser confocal microscope; the abradability of the coating is evaluated by adopting the abrasion volume of the coating, and the larger the abrasion volume is, the better the abradability is; the abrasion resistance of the steel ball is evaluated by adopting the abrasion volume of the steel ball, and the smaller the abrasion volume is, the better the abrasion resistance is.
The detection results are as follows:
seal coating wear volume contrast
| Coating class | Wear volume (×10) 6 μm 3 ) |
| Example 1 seal coating | 9.35±0.36 |
| Example 2 seal coating | 8.65±0.24 |
| Example 3 seal coating | 7.27±0.51 |
| Comparative example 1 seal coating | 9.48±0.47 |
Contrast of wear volumes of oppositely-worn steel balls
| Coating class | Wear volume (×10) 6 μm 3 ) |
| Opposite grinding steel balls in example 1 | 2.48±0.32 |
| Opposite grinding steel balls in example 2 | 0.93±0.47 |
| Opposite grinding steel ball in example 3 | 4.24±0.26 |
| Opposite grinding steel ball in comparative example 1 | 9.40±0.28 |
The abrasion volumes of the two coatings prepared in the examples 1, 2 and 3 and the comparative example 1 and the abrasion volumes of the two coatings on the grinding steel balls are measured by adopting a laser confocal microscope, and the abrasion volumes of the coatings are close to each other as shown by the internal values of the abrasion volume comparison table of the sealing coating, so that the abrasion influence on the coatings after the self-repairing mineral components are added is smaller; in the table of the abrasion volume of the abrasion steel ball, the abrasion volume of the abrasion steel ball with the coating prepared in example 2 is 0.93 multiplied by 10 under the same abrasion condition due to the self-repairing effect of the attapulgite mineral component on the abrasion mark surface in the friction abrasion process 6 The wear volume of the steel balls of the coating prepared in comparative example 1 is reduced by 90.1 percent, and the wear resistance of the material is improved by 9.1 times.
FIG. 4 is a graph showing the friction coefficient curves of the coatings prepared in example 1 and comparative example 1, wherein the friction curves of the 2 coatings tended to be uniform before 1200 seconds, and the friction coefficient of the coating of comparative example 1 without attapulgite was continuously increased; the friction coefficient of the coating of the embodiment 1 added with the attapulgite tends to be mild, and the friction surface gradually forms a self-repairing reaction layer along with the occurrence of friction reaction, so that the coating has a good antifriction effect. Fig. 5 and 6 show the morphology of the abrasion marks of the abrasion friction pair (abrasion steel ball) of the coating prepared in comparative example 1 and example 1, respectively, and the abrasion of the abrasion friction pair can be delayed by the coating prepared in example 1 as seen by measuring the appearance size.
According to the detection results, the sealing coating prepared by the method provided by the invention has lower friction coefficient while ensuring the abradability of the sealing coating, and has a damage repairing effect on the surface of the dual friction piece, so that the abrasion resistance of the dual friction piece is obviously improved, and the sealing coating has better sealing performance.
According to the invention, the layered silicate mineral component is added into the sealing coating material, so that the friction coefficient of the coating can be obviously reduced under the condition of not changing the hardness, abradability and strength of the original sealing coating, and the surface state of the dual friction piece is ensured not to be damaged, thereby improving the sealing performance and reliability of the system and reducing the energy consumption of the system. The self-repairing sealing coating prepared by the invention can provide self-repairing components for the dual friction piece when the self-repairing sealing coating is worn, and induce the friction chemical reaction between the dual friction piece material and silicate minerals, thereby realizing the self-repairing and performance strengthening of the friction surface damage of the dual friction piece, effectively improving the wear resistance and erosion resistance of the dual friction piece, and improving the sealing performance and the service life of the system. The preparation technical process route of the self-repairing sealing coating provided by the invention is consistent with the preparation technical process route of the sealing coating, silicate mineral components are added into commercial sealing coating materials in the form of self-repairing prefabricated powder, flexible regulation and control of the self-repairing components in the coating can be realized, and the composite preparation process of the self-repairing components and the sealing coating materials is simple. The method provided by the invention is suitable for various sealing coating or sealing coating material systems and related application scenes, and has good industrial application prospect.
While the invention has been described and illustrated with reference to specific embodiments thereof, the description and illustration is not intended to limit the invention. It will be apparent to those skilled in the art that various changes may be made in this particular situation, material, composition of matter, substance, method or process without departing from the true spirit and scope of the invention as defined by the following claims, so as to adapt the objective, spirit and scope of the present application. All such modifications are intended to be within the scope of this appended claims. Although the methods disclosed herein have been described with reference to particular operations being performed in a particular order, it should be understood that these operations may be combined, sub-divided, or reordered to form an equivalent method without departing from the teachings of the present disclosure. Thus, unless specifically indicated herein, the order and grouping of operations is not a limitation of the present application.
Claims (10)
1. A preparation method of a wear self-repairing sealing coating comprises the following steps:
carrying out composite granulation on silicate mineral powder and metal powder to obtain self-repairing pre-powder; the silicate mineral powder is lamellar silicate mineral powder;
mixing the self-repairing pre-powder and the sealing coating powder to obtain composite powder;
and spraying the composite powder to obtain the abrasion self-repairing sealing coating.
2. The method according to claim 1, wherein the silicate mineral powder has a particle size of 2 to 5 μm;
the silicate mineral powder is one or more selected from attapulgite and serpentine.
3. The method of claim 1, wherein the metal powder has a particle size of 500 mesh or less;
the metal powder is selected from aluminum-based and/or nickel-based metal powder.
4. The method according to claim 1, wherein the mass of the silicate mineral powder is 5 to 50% of the mass of the metal powder.
5. The method of claim 1, wherein the method of composite granulation comprises:
dispersing and mixing metal powder, silicate mineral powder, a dispersing medium and a binder to obtain composite powder slurry;
and carrying out spray granulation and drying on the composite powder slurry to obtain the self-repairing pre-powder.
6. The method of claim 5, wherein the dispersion medium is ethanol;
the binder is polyvinyl alcohol.
7. The method of claim 1, wherein the self-healing pre-powder has a particle size of 100-200 mesh;
the granularity of the sealing coating powder is 100-200 meshes.
8. The method of claim 1, wherein the spraying is flame spraying;
the spraying method comprises the following steps:
and (3) sequentially carrying out surface cleaning, surface sand blowing, adhesive layer spraying and composite powder spraying on the substrate.
9. The method according to claim 8, wherein the bonding layer material used in the bonding layer spraying process is selected from NiAl-based and/or MCrAlY-based materials, and M is selected from Fe, ni and/or Co;
the working gas in the process of spraying the bonding layer comprises the following components: oxygen and acetylene;
the flow rate of the oxygen is 1.2-1.4 m 3 And/h, wherein the pressure of the oxygen is 0.6-1.0 MPa;
the flow of the acetylene is 1.3-1.5 m 3 And/h, wherein the pressure of acetylene is 0.1-0.2 MPa;
the cooling gas is compressed air, and the pressure of the compressed air is 0.3-0.7 MPa;
the spraying distance is 200-300 mm;
the spraying thickness is 0.1-0.2 mm.
10. The method according to claim 8, wherein the spraying distance in the process of spraying the composite powder is 160-220 mm;
the working gas includes: oxygen and acetylene;
the flow rate of the oxygen is 1.2-1.4 m 3 And/h, wherein the pressure of the oxygen is 0.6-1.0 MPa;
the flow of the acetylene is 1.3-1.5 m 3 And/h, wherein the pressure of acetylene is 0.1-0.2 MPa;
the cooling gas is compressed air, and the pressure of the compressed air is 0.3-0.7 MPa;
the spraying thickness is 0.5-1 mm.
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