CN110144510B - Tungsten carbide-chromium carbide-nickel molybdenum composite powder, coating and preparation method thereof - Google Patents
Tungsten carbide-chromium carbide-nickel molybdenum composite powder, coating and preparation method thereof Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 85
- 239000011248 coating agent Substances 0.000 title claims abstract description 69
- 238000000576 coating method Methods 0.000 title claims abstract description 69
- 239000002131 composite material Substances 0.000 title claims abstract description 38
- 239000011651 chromium Substances 0.000 title claims abstract description 29
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 24
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910052721 tungsten Inorganic materials 0.000 title claims abstract description 22
- 239000010937 tungsten Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title abstract description 6
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims abstract description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 17
- 230000007797 corrosion Effects 0.000 claims abstract description 14
- 238000005260 corrosion Methods 0.000 claims abstract description 14
- 238000005507 spraying Methods 0.000 claims abstract description 14
- 229910003470 tongbaite Inorganic materials 0.000 claims abstract description 11
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 8
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 8
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 24
- 238000005488 sandblasting Methods 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- 239000011159 matrix material Substances 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 9
- 229910001404 rare earth metal oxide Inorganic materials 0.000 claims description 8
- 238000001694 spray drying Methods 0.000 claims description 7
- 229910052593 corundum Inorganic materials 0.000 claims description 6
- 239000010431 corundum Substances 0.000 claims description 6
- 238000000265 homogenisation Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000002474 experimental method Methods 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- 238000003892 spreading Methods 0.000 claims description 5
- 238000010285 flame spraying Methods 0.000 claims description 4
- 230000007935 neutral effect Effects 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000007788 roughening Methods 0.000 claims description 2
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 2
- 239000000758 substrate Substances 0.000 abstract description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 239000003921 oil Substances 0.000 description 4
- 239000001294 propane Substances 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 3
- 238000009713 electroplating Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- -1 Q345 Substances 0.000 description 2
- 229910000870 Weathering steel Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000007743 anodising Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B22F1/0003—
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
-
- 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
- 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
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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)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention discloses tungsten carbide-chromium carbide-nickel molybdenum composite powder, a coating and a preparation method thereof, wherein the composite powder comprises the following components in percentage by mass: 64 to 74% of Cr3C2：15～35％、Ni：1～9％、Mo：1～9％、La2O3: 0.1 to 1.5 percent. The coating can be prepared on a substrate by spraying the composite powder through supersonic speed atmospheric flame, the thickness of the coating is 100-450 mu m, and the porosity of the coating is less than 0.5 percent; microhardness of the coating is more than 1200HV0.2(ii) a The bonding strength of the coating and the substrate is more than or equal to 75MPa, and the coating has the characteristics of wear resistance, corrosion resistance and cavitation resistance, and can meet the actual engineering use requirements with higher requirements.
Description
Technical Field
The invention relates to tungsten carbide-chromium carbide-nickel molybdenum composite powder and a coating thereof, in particular to La-containing composite powder with abrasion resistance, corrosion resistance and cavitation resistance2O3The tungsten carbide-chromium carbide-nickel molybdenum composite powder, the coating and the preparation method thereof.
Background
Mechanical component surface failures are primarily caused by wear, corrosion, cavitation, etc., and can lead to premature component failure. Each year, the economic losses caused by the method, such as time cost, resource waste, environmental governance and the like, are hundreds of millions. At present, in order to solve the problem, the most important way is to perform surface strengthening on the surface of the mechanical part by a surface treatment technology, such as anodizing the surface of the aluminum alloy, spraying epoxy silicon carbide on the surface of the alloy steel, electroplating hard chrome, and the like. However, the surface of the anode is poor in abrasion resistance, and the generated waste liquid can cause great water environment pollution; hexavalent chromium in waste water discharged by electroplating hard chromium is harmful to animals, plants and human beingsHas great harm; the epoxy carborundum coating has poor binding force with the substrate and is easy to fall off, so that the service life of the equipment is greatly shortened. The tungsten carbide-chromium carbide-nickel molybdenum composite powder is made up by using WC and Cr3C2And metal alloy binding phase Ni and Mo according to the corresponding proportion. The coating prepared on different steel substrates, such as Q345, stainless steel and the like, by using the supersonic speed atmospheric flame spraying technology has the characteristics of high hardness, wear resistance and corrosion resistance. However, compared with the coating prepared by electroplating hard chromium and anodizing technology, the tungsten carbide-chromium carbide-nickel molybdenum coating has weaker corrosion resistance, especially in the environment containing nitrate ions, hydrofluoric acid and the like; in a turbulent and turbulent seawater environment, the tungsten carbide-chromium carbide-nickel molybdenum coating has poor cavitation resistance; meanwhile, the film-substrate bonding strength and the high-temperature oxidation resistance of the tungsten carbide-chromium carbide-nickel molybdenum coating are relatively weak.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides tungsten carbide-chromium carbide-nickel molybdenum composite powder, a coating and a preparation method thereof, wherein the coating is prepared by adding La into the coating2O3The corrosion resistance, cavitation resistance, high-temperature oxidation resistance and the bonding strength with a matrix of the tungsten carbide-chromium carbide-nickel molybdenum coating material are improved, so that the coating has the characteristics of wear resistance, corrosion resistance and cavitation resistance and can meet the actual engineering use requirements with higher requirements.
The tungsten carbide-chromium carbide-nickel molybdenum composite powder comprises the following components in percentage by mass: 64 to 74% of Cr3C2：15～35％、Ni：1～9％、Mo：1～9％、La2O3：0.1～1.5％。
The tungsten carbide-chromium carbide-nickel molybdenum coating is prepared by spraying the composite powder through supersonic speed atmospheric flame, the thickness of the coating is 100-450 mu m, and the porosity of the coating is less than 0.5 percent; microhardness of the coating is more than 1200HV0.2(ii) a The bonding strength of the coating and the matrix is more than or equal to 75 MPa.
The preparation method of the tungsten carbide-chromium carbide-nickel molybdenum coating comprises the following steps:
(1) choose to useWC powder with a powder particle size of 0.5-1 μm, Cr powder with a particle size of 0.5-1 μm3C2Powder, pure Ni metal powder with a particle size of 0.5-1 μm, pure Mo powder with a particle size of 0.5-1 μm, La2O3The particle size of (A) is 20-40 nm. The purity of the Ni metal powder is not less than 99.9 percent, the purity of the Mo metal powder is not less than 99.9 percent, and the rare earth oxide La is2O3The purity is not lower than 99.9%; the powder is weighed according to the following mixture ratio: WC: 64 to 74 wt% of Cr3C2：15～35wt％、Ni：1～9wt％、Mo：1～9wt％、La2O3: 0.1-1.5 wt%, and mixing the powder in a ball mill for 15-50 hours to realize homogenization of the composite powder; and spray drying to obtain composite powder with particle size of 5-30 um.
(2) Flatly spreading the composite powder, and drying in a blast drying oven at the heat preservation temperature of 70-110 ℃ for 3-5 hours;
(3) cleaning the sprayed base material by using absolute ethyl alcohol or acetone through ultrasonic cleaning, and drying the sprayed base material in a heat-preservation drying box at 40-70 ℃ to remove oil stains on the surface of the sprayed base material;
(4) derusting and roughening the surface of the spraying base material by adopting a compressed air power sand blasting method, wherein the sand blasting treatment adopts 20-40 meshes of white corundum or brown corundum, the pressure of compressed air during sand blasting is 0.4-0.7 MPa, the sand blasting distance is 90-140 mm, and the sand blasting angle is 50-90 degrees;
(5) and (3) spraying the composite powder treated in the step (2) on the surface of the base material by adopting supersonic speed atmospheric flame spraying to obtain the tungsten carbide-chromium carbide-nickel molybdenum coating which is wear-resistant, corrosion-resistant and cavitation-resistant on the surface of the sprayed base material.
According to the invention, lanthanum oxide is added into the tungsten carbide-chromium carbide-nickel molybdenum powder, and the lanthanum oxide belongs to rare earth oxide, and the rare earth element has strong activity, and can react with impurity elements such as sulfur, nitrogen, silicon and the like in the crystallization process to generate a high-melting-point compound which is inlaid on defects such as crystal boundary, dislocation, phase boundary and the like, so that the growth of crystal grains and the decarburization of WC can be effectively inhibited, the crystal grains are refined, the bonding state of a coating and a matrix is improved, and the coating has the effects of solid solution strengthening and dispersion strengthening. Hardness and strength of the coatingThe degree and the wear resistance are improved to a certain degree, and the bonding strength with a matrix is also greatly improved; in addition, the porosity of the coating is greatly reduced, the strength is obviously improved, the coating is higher in compactness, the infiltration capacity of corrosive media is effectively reduced, and the corrosion resistance and the cavitation resistance of the coating are improved; meanwhile, the generation of oxide holes and cracks on the surface of the coating is reduced, so that the high-temperature oxidation resistance of the coating is improved. La-containing film obtained by the present invention2O3The thickness of the tungsten carbide-chromium carbide-nickel molybdenum coating is 100-450 mu m, and the porosity of the coating is less than 0.5 percent; microhardness of the coating is more than 1200HV0.2(ii) a The bonding strength of the coating is more than or equal to 75 MPa; the salt spray corrosion experiment shows that no obvious corrosion behavior is found in 720 hours of the coating; the cavitation rate of the coating is low.
The La-containing film of the invention2O3The tungsten carbide-chromium carbide-nickel molybdenum composite coating has greatly improved microhardness, film-substrate bonding strength, corrosion resistance and cavitation resistance, and is low in production cost, high in efficiency, reliable in process and stable in performance, and suitable for large-scale application in the fields of hydraulic machinery flow passage components, turbine blades of steam turbines, hydraulic piston rods of marine equipment and the like.
The present invention is further illustrated by the following examples.
Detailed Description
According to the embodiment of the invention, atmospheric supersonic flame spraying equipment is adopted, the air pressure is 80-100 psi, the propane pressure is 70-80 psi, the nitrogen flow is 20-25 slpm, and the spraying distance is 175-225 mm;
the compressed air power sand blasting method adopted in the embodiment of the invention is used for carrying out rust removal and texturing treatment on the surface of the spraying substrate, the sand blasting treatment adopts 20-40 meshes of white corundum or brown corundum, the pressure of compressed air during sand blasting is 0.4-0.7 MPa, the sand blasting distance is 90-140 mm, and the sand blasting angle is 50-90 degrees;
in the embodiment of the invention, WC powder with the powder granularity of 0.5-1 mu m and Cr with the powder granularity of 0.5-1 mu m are adopted3C2Adding pure Ni metal powder with the granularity of 0.5-1 mu m and pure Mo powder with the granularity of 0.5-1 mu m into the powder, wherein the granularity is 20-40nm, and the purity is not lower than 99.9 percent of rare earth oxide La2O3Wherein the mass fraction of WC is 64-74 wt%, Cr3C215-35 wt% of Ni, 1-9 wt% of Mo, 1-9 wt% of La2O3The mass fraction is 0.5-1.5 wt%, and the powder is mixed in a ball mill for 15-50 hours to realize the homogenization of the composite powder; the composite powder is obtained by spray drying, and the granularity is 5-30 um.
In the embodiment of the invention, the spray coating substrate adopts Q345NH weathering steel or 0Cr13Ni5Mo stainless steel
Example 1
Adopting WC powder with the powder granularity of 0.5-1 mu m and Cr with the granularity of 0.5-1 mu m3C2Adding pure Ni metal powder with the granularity of 0.5-1 mu m and pure Mo powder with the granularity of 0.5-1 mu m into the powder, and adding rare earth oxide La with the purity of not less than 99.9 percent2O3The granularity is 20-40nm, wherein the mass fraction of each component is WC: 68 wt% of Cr3C2：20wt％、Ni：6wt％、Mo：5wt％、La2O3: 1 wt%. And mixing the powder in a ball mill for 20 hours to realize the homogenization of the composite powder, and then obtaining the composite powder with the granularity of 5-30um by a spray drying method.
And flatly spreading the composite powder, and drying in an electric heating drying oven at the heat preservation temperature of 105 ℃ for 3 hours.
Cleaning the surface of the 0Cr13Ni5Mo stainless steel sprayed base material with acetone, drying the base material in a heat preservation box at 60 ℃, removing oil stains on the surface of the base material, and performing rust removal and texturing treatment on the surface of the base material by adopting the compressed air power sand blasting method.
The composite powder in the embodiment is sprayed by adopting atmospheric supersonic flame, and the process parameters are as follows: the air pressure was 90psi, the propane pressure was 79psi, the nitrogen flow was 23slpm, the spraying distance was 190mm, the moving speed of the spray gun was 1200mm/s, and the powder feeding speed was 4 r/min.
The coating obtained was prepared with a thickness of 272 μm and an average microhardness of 1261HV0.2(ii) a Average porosity of 0.41% lower than that without La addition2O3The average porosity of the coating prepared by the same method is 0.925 percent; coating layerThe bonding strength with the matrix is 87MPa and is higher than that without adding La2O3The bonding strength of the coating prepared by the same method and a substrate is 69 MPa; the cavitation rate of the coating is far lower than that of the base material compared with that of the base material without adding La2O3The cavitation rate of the coating prepared by the same method is reduced by 33 percent; no obvious rust spot is found in the 720-hour neutral salt spray experiment.
Example 2
Adopting WC powder with the powder granularity of 0.5-1 mu m and Cr with the granularity of 0.5-1 mu m3C2Adding pure Ni metal powder with the granularity of 0.5-1 mu m and pure Mo powder with the granularity of 0.5-1 mu m into the powder, and adding rare earth oxide La with the purity of not less than 99.9 percent2O3The granularity is 20-40nm, wherein the mass fraction of each component is WC: 64 wt% of Cr3C2：22wt％、Ni：7.2wt％、Mo：6wt％、La2O3: 0.8 wt%. And mixing the powder in a ball mill for 25 hours to realize the homogenization of the composite powder, and then obtaining the composite powder with the granularity of 5-30um by a spray drying method.
And flatly spreading the composite powder, and drying in an electric heating drying oven at the heat preservation temperature of 105 ℃ for 3 hours.
Cleaning the surface of the Q345NH weathering steel spray-coated substrate with acetone, drying the substrate in a heat-insulating box at 60 ℃, removing oil stains on the surface of the substrate, and performing rust removal and texturing treatment on the surface of the substrate by adopting the compressed air power sand blasting method.
The composite powder in the embodiment is sprayed by adopting atmospheric supersonic flame, and the process parameters are as follows: the air pressure was 88psi, the propane pressure was 80psi, the nitrogen flow was 24slpm, the spraying distance was 210mm, the moving speed of the spray gun was 1000mm/s, and the powder feeding speed was 3 r/min.
The coating thickness obtained was 285 μm and the average microhardness was 1251HV0.2Average porosity of 0.38% lower than that without La addition2O3The average porosity of the coating prepared by the same method is 1.15 percent; the bonding strength of the coating and the matrix is 83MPa and is higher than that of the coating without La2O3The bonding strength between the coating and the substrate prepared by the same method is 71 MPa; the cavitation rate of the coating is far lower than that of the baseBulk material, also lower than without La addition2O3The cavitation rate of the coating prepared by the same method is reduced by 34 percent; no obvious rust spot is found in the 720-hour neutral salt spray experiment.
Example 3
Adopting WC powder with the powder granularity of 0.5-1 mu m and Cr with the granularity of 0.5-1 mu m3C2Adding pure Ni metal powder with the granularity of 0.5-1 mu m and pure Mo powder with the granularity of 0.5-1 mu m into the powder, and adding rare earth oxide La with the purity of not less than 99.9 percent2O3The granularity is 20-40nm, wherein the mass fraction of each component is WC: 67.5 wt%, Cr3C2：18wt％、Ni：8wt％、Mo：6wt％、La2O3: 0.5 wt%. And mixing the powder in a ball mill for 30 hours to realize the homogenization of the composite powder, and then obtaining the composite powder with the granularity of 5-30um by a spray drying method.
And flatly spreading the composite powder, and drying in an electric heating drying oven at the heat preservation temperature of 105 ℃ for 3 hours.
Cleaning the surface of the 0Cr13Ni5Mo stainless steel sprayed base material with acetone, drying the base material in a heat preservation box at 60 ℃, removing oil stains on the surface of the base material, and performing rust removal and texturing treatment on the surface of the base material by adopting the compressed air power sand blasting method.
The composite powder in the embodiment is sprayed by adopting atmospheric supersonic flame, and the process parameters are as follows: the air pressure was 92psi, the propane pressure was 76psi, the nitrogen flow was 20slpm, the spraying distance was 180mm, the moving speed of the spray gun was 1200mm/s, and the powder feeding speed was 4 r/min.
The resulting coating was prepared to have a thickness of 279 μm and an average microhardness of 1211HV0.2The average porosity is 0.39%, the bonding strength between the coating and the matrix is 86MPa, and the cavitation rate of the coating is far lower than that of the matrix material and also lower than that of the coating without the addition of La2O3The cavitation rate of the coating prepared by the same method is reduced by 29 percent, and no obvious rust spot is found in 720 hours of a neutral salt spray experiment.
Claims (3)
1. The tungsten carbide-chromium carbide-nickel molybdenum coating is characterized in that the following composite powder is adopted and subjected to supersonic speedThe composite powder is prepared by spraying atmospheric flame, and comprises the following components in percentage by mass: 64 to 74% of Cr3C2：15~35%、Ni：1~9%、Mo：1~9%、La2O3: 0.1-1.5%; wherein the WC powder has a particle size of 0.5-1 μm and Cr3C2Has a particle size of 0.5-1 μm, Ni metal powder particle size of 0.5-1 μm, Mo powder particle size of 0.5-1 μm, La2O3The particle size of (A) is 20-40 nm; the composite powder is obtained by a spray drying method, and the granularity is 5-30 um; the thickness of the coating is 100-450 mu m, and the porosity of the coating is less than 0.5 percent; microhardness of the coating is more than 1200HV0.2(ii) a The bonding strength of the coating and the matrix is more than or equal to 75MPa, and no obvious corrosion point is found in a neutral salt spray experiment for 720 hours.
2. The tungsten carbide-chromium carbide-nickel molybdenum coating of claim 1, wherein the Ni metal powder has a purity of not less than 99.9%, the Mo metal powder has a purity of not less than 99.9%, and the rare earth oxide La is2O3The purity is not lower than 99.9%.
3. A method of preparing a tungsten carbide-chromium carbide-nickel molybdenum coating according to claim 1, comprising the steps of:
(1) mixing WC powder and Cr3C2Powder, Ni metal powder, Mo powder and rare earth oxide La2O3Mixing the powder in a ball mill for 15-50 hours according to the proportion to realize the homogenization of the composite powder; spray drying to obtain composite powder with particle size of 5-30 um;
(2) flatly spreading the composite powder, and drying in a blast drying oven at the heat preservation temperature of 70-110 ℃ for 3-5 hours;
(3) cleaning the sprayed base material by using absolute ethyl alcohol or acetone through ultrasonic cleaning, and drying the sprayed base material in a heat-preservation drying box at 40-70 ℃ to remove oil stains on the surface of the sprayed base material;
(4) derusting and roughening the surface of the spraying base material by adopting a compressed air power sand blasting method, wherein the sand blasting treatment adopts 20-40 meshes of white corundum or brown corundum, the pressure of compressed air during sand blasting is 0.4-0.7 MPa, the sand blasting distance is 90-140 mm, and the sand blasting angle is 50-90 degrees;
(5) and (3) spraying the composite powder treated in the step (2) on the surface of the base material by adopting supersonic speed atmospheric flame spraying to obtain the tungsten carbide-chromium carbide-nickel molybdenum coating which is wear-resistant, corrosion-resistant and cavitation-resistant on the surface of the sprayed base material.
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