CN111411319B - A method for preparing nitride-enhanced high-entropy alloy coating by plasma cladding - Google Patents
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- 239000011248 coating agent Substances 0.000 title claims abstract description 46
- 238000000576 coating method Methods 0.000 title claims abstract description 46
- 238000005253 cladding Methods 0.000 title claims abstract description 40
- 239000000956 alloy Substances 0.000 title claims abstract description 31
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 14
- 150000004767 nitrides Chemical class 0.000 title claims abstract description 13
- 239000011812 mixed powder Substances 0.000 claims abstract description 25
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims abstract description 16
- 230000001681 protective effect Effects 0.000 claims abstract description 12
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims description 39
- 239000007789 gas Substances 0.000 claims description 32
- 238000000498 ball milling Methods 0.000 claims description 26
- 238000002156 mixing Methods 0.000 claims description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- 239000011159 matrix material Substances 0.000 claims description 21
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 238000003801 milling Methods 0.000 claims 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 abstract description 8
- 238000005275 alloying Methods 0.000 abstract description 4
- 229910052804 chromium Inorganic materials 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 5
- 238000002844 melting Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- -1 CrN (1750 HV) Chemical class 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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- 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
- C23C4/134—Plasma spraying
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing 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
- C23C4/04—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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
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Abstract
本发明公开了一种等离子熔覆制备氮化物增强高熵合金涂层的方法，在低碳钢表面采用等离子束混有8%~12%氮气的氩气保护下加热熔覆一定比例的Ni‑Cr‑B‑Si、Co‑Cr‑B‑Si、Cu、Al、Ti组成的混合粉，其中混合气作保护气和离子气，在熔覆过程中混合气中的氮被电离活化，并与熔池中的Cr、Al、Ti反应形成细小的氮化物，在熔覆过程中由于高熵合金的迟滞效应，初生的Cr7C3具有晶粒细小的特点，最后与氮化物弥散分布于高熵合金，形成了由CrN、AlN、TiN、Cr7C3增强的AlCoCrCuNiTi高熵合金涂层。The invention discloses a method for preparing a nitride-enhanced high-entropy alloy coating by plasma cladding. The surface of a low-carbon steel is heated and clad with a certain proportion of Ni- Mixed powder composed of Cr-B-Si, Co-Cr-B-Si, Cu, Al, Ti, in which the mixed gas is used as protective gas and ion gas. Cr, Al and Ti in the molten pool reacted to form fine nitrides. During the cladding process, due to the hysteresis effect of the high-entropy alloy, the primary Cr 7 C 3 had the characteristics of fine grains, and finally dispersed with the nitrides in the high-entropy alloy. Entropy alloying, the AlCoCrCuNiTi high - entropy alloy coating reinforced by CrN, AlN, TiN, Cr7C3 was formed.
Description
Technical Field
The invention belongs to the field of high-energy beam surface treatment, and particularly relates to a method for preparing a wear-resistant composite coating by plasma cladding.
Background
The low-carbon steel is carbon steel with the carbon content of less than 0.25 percent, the annealing structure of the low-carbon steel is ferrite and a small amount of pearlite, the low-carbon steel has the characteristics of lower strength and hardness, better plasticity and toughness, good cold formability and good weldability, and has been widely applied to the fields of petrochemical industry, automobile manufacturing, aerospace, ships and the like. However, low carbon steel has low hardness and poor wear resistance, so that the application of the low carbon steel is limited to a certain extent. The hardness and the wear resistance of the low-carbon steel can be improved by cladding the high-entropy alloy coating on the surface of the low-carbon steel. The high-entropy alloy is formed by alloying more than five components according to equal atomic ratio or close to the equal atomic ratio, the high-entropy alloy can form a solid solution to realize solid solution strengthening, so that the high-entropy alloy has excellent mechanical properties such as high hardness, high toughness, high wear resistance and corrosion resistance, high strength and the like which are incomparable with the traditional alloy, and is particularly suitable for preparing a coating, and nitrides such as CrN (1750 HV), AlN (1300 HV), TiN (2300 HV) and the like are added in the high-entropy alloy coating and are dispersedly distributed on the high-entropy alloy coating, so that the hardness and the wear resistance of the high-entropy alloy coating are more favorably enhanced. The plasma cladding is to coat the alloy powder on the surface of the low-carbon steel substrate, heat and clad the alloy powder by using plasma beams, and form the wear-resistant coating after cooling. The plasma cladding equipment is simple, good in reliability, capable of saving cost and wide in application. In the cladding process, a small amount of N2 is mixed in inert Ar gas, nitrogen is ionized and activated, and then the nitrogen reacts with Cr, Al and Ti in a molten pool to form nitrides CrN, AlN and TiN, so that the hardness and the wear resistance of the coating can be further improved.
Disclosure of Invention
The invention adopts plasma cladding to clad the mixed powder consisting of the self-melting alloy with low melting point and the simple substance metal powder, can realize alloying in the cladding process to form the high-entropy alloy, adopts pure argon as the protective gas and the ionized gas in the past, and adopts a proper amount of nitrogen as the working gas to ensure that nitrogen in the mixed gas reacts with Cr, Al and Ti in a molten pool after being ionized and activated to form fine and dispersed nitride, so as to prepare the nitride-reinforced high-entropy alloy coating, thereby being beneficial to further improving the hardness and the wear resistance of the coating.
The manufacturing method adopted by the invention comprises the following process steps:
the method comprises the following steps of firstly, selecting a low-carbon steel surface to be cladded as a matrix, pretreating the surface of the low-carbon steel matrix, polishing the surface of the matrix to be cladded by using a grinding wheel or abrasive paper to remove rust and oxides, and removing oil stains on the surface of the matrix by using alcohol or acetone.
Step two, mixing Ni-Cr-B-Si, Co-Cr-B-Si, Cu, Al and Ti according to a certain proportion to form mixed powder, and performing ball milling and mixing by using a ball mill, wherein the particle size of the used powder is 40-280 mu m, the mass percentages of the components of Ni-Cr-B-Si are 15-18 of Cr, 2.5-4.5 of B, 3-4.5 of Si, 0.6-1 of C and the balance of Ni; the mass percentages of the components of Co-Cr-B-Si are 15-18% of Cr, 2.5-4.5% of B, 3-4.5% of Si, 0.6-1% of C and the balance of Co; the purities of the Cu powder and the Al powder are both higher than 99.5%; the purity of the Ti powder is higher than 99 percent; the mixed powder comprises the following components in percentage by mass: 24-30: 18-26: 8-12. Ball milling and mixing: ball milling and mixing are carried out by adopting a steel ball milling tank, wherein the mass ratio of grinding balls to mixed powder is 2.4-3.0: 1, a vacuum valve is opened after sealing, vacuum pumping is carried out for 20-40 minutes, the ball milling tank is placed into a planetary ball mill, the rotating speed is 260-280 r/min, the inversion frequency is 30-50 Hz, and the ball milling and mixing time is 50-70 minutes.
And step three, mixing the mixed powder and the pressure-sensitive adhesive according to a weight ratio of 1: 1.1-1.5 to prepare cladding powder, coating the cladding powder on the surface of the low-carbon steel substrate, wherein the coating thickness is 0.7-1.3 cm, the coating width is 0.8-1 cm, and drying for 1.5-2 h at 120-140 ℃.
Step four, heating the cladding powder by adopting plasma beams for cladding, wherein the technological parameters are set as follows: argon mixed with 8-12% of nitrogen is used as protective gas and ionized gas, the cladding parameter current is 100-150A, the working voltage is 20-50V, the scanning speed is 3-6 mm/s, and the flow of the mixed gas used as the protective gas is 0.8-1.4 m3The flow rate of the mixture gas as the ionized gas is 0.9 to 1.5m3The distance between the nozzle and the surface to be treated is 0.8-1.2 cm.
The invention has the beneficial effects that:
(1) the invention utilizes the ionization activation of nitrogen in the mixed gas, the nitrogen can react with Cr, Al and Ti in a molten pool to form fine and dispersed nitride, and the primary Cr is generated due to the delayed diffusion effect of the high-entropy alloy7C3The crystal grains are fine and can be dispersed and distributed in the high-entropy alloy with nitride, which is beneficial to improving the wear resistance and forms a high-entropy alloy consisting of CrN, AlN, TiN and Cr7C3The reinforced AlCoCrCuNiTi high-entropy alloy coating has high hardness, good toughness and good wear resistance.
(2) The high-entropy alloy is adopted as the matrix of the wear-resistant coating, and the special characteristics of low diffusion speed and insensitivity to component change can be fully utilized, so that the coating has higher toughness, strength and wear resistance.
(3) The invention uses the original commonly used Ni-Cr-B-Si and Co-Cr-B-Si self-melting alloy powder, has the advantages of low melting point, uniform components and low cost, has better intersolubility of Fe, Ni and Co, and is easy to realize alloying.
Detailed Description
Example 1:
selecting the surface of Q255 steel to be clad as a matrix, pretreating the surface of the matrix, polishing the surface of the matrix to be clad by using a grinding wheel or abrasive paper to remove rust and oxides, and removing oil stains on the surface of the matrix by using alcohol or acetone.
Step two, mixing Ni-Cr-B-Si, Co-Cr-B-Si, Cu, Al and Ti according to a certain proportion to form mixed powder, and performing ball milling and mixing by using a ball mill, wherein the particle size of the used powder is 40-280 mu m, the mass percentages of the components of Ni-Cr-B-Si are 15-18 of Cr, 2.5-4.5 of B, 3-4.5 of Si, 0.6-1 of C and the balance of Ni; the mass percentages of the components of Co-Cr-B-Si are 15-18% of Cr, 2.5-4.5% of B, 3-4.5% of Si, 0.6-1% of C and the balance of Co; the purities of the Cu powder and the Al powder are both higher than 99.5%; the purity of the Ti powder is higher than 99 percent; the mixed powder comprises the following components in percentage by mass: 26:26:24:12:12. Ball-milling and mixing the mixed powder by adopting a steel ball-milling tank, wherein the mass ratio of the grinding balls to the mixed powder is 2.4:1, sealing, opening a vacuum valve, vacuumizing for 20 minutes, putting the ball-milling tank into a planetary ball mill, rotating at 260 r/min, inverting at 50 Hz, and ball-milling and mixing for 70 minutes.
And step three, mixing the mixed powder and the pressure-sensitive adhesive according to the weight ratio of 1:1.1 to prepare cladding powder, coating the cladding powder on the surface of a Q255 steel substrate, wherein the coating thickness is 1.3 cm, the coating width is 0.8 cm, and drying for 2 h at 140 ℃.
Step four, heating the cladding powder by adopting plasma beams for cladding, wherein the technological parameters are set as follows: argon mixed with 8 percent of nitrogen is used as protective gas and ionized gas, the cladding parameter current is 130A, the working voltage is 50V, the scanning speed is 3 mm/s, and the flow of the mixed gas used as the protective gas is 1.4 m3H, the flow rate of the mixture as ionized gas is 1.5m3The distance of the nozzle from the surface to be treated was 1.2 cm.
As a result, it was found that CrN, AlN, TiN, Cr were formed on the surface of the Q255 substrate7C3The strengthened AlCoCrCuNiTi high-entropy alloy coating is combined with a substrate in a chemical metallurgy manner, wherein the strengthened phase is fine and is distributed basically uniformly, the appearance of the coating is smooth, the coating basically has no defects such as air holes and cracks, the thickness of the coating is about 550 mu m, and the wear resistance is improved by 5.6 times.
Example 2:
selecting the surface of Q195 steel to be clad as a matrix, pretreating the surface of the matrix, polishing the surface of the matrix to be clad by using a grinding wheel or abrasive paper to remove rust and oxides, and removing oil stains on the surface of the matrix by using alcohol or acetone.
Step two, mixing Ni-Cr-B-Si, Co-Cr-B-Si, Cu, Al and Ti according to a certain proportion to form mixed powder, and performing ball milling and mixing by using a ball mill, wherein the particle size of the used powder is 40-280 mu m, the mass percentages of the components of Ni-Cr-B-Si are 15-18 of Cr, 2.5-4.5 of B, 3-4.5 of Si, 0.6-1 of C and the balance of Ni; the mass percentages of the components of Co-Cr-B-Si are 15-18% of Cr, 2.5-4.5% of B, 3-4.5% of Si, 0.6-1% of C and the balance of Co; the purities of the Cu powder and the Al powder are both higher than 99.5%; the purity of the Ti powder is higher than 99 percent; the mixed powder comprises the following components in percentage by mass: 28:28:24:10:10. Ball-milling and mixing the mixed powder by adopting a steel ball-milling tank, wherein the mass ratio of the grinding balls to the mixed powder is 2.7:1, sealing, opening a vacuum valve, vacuumizing for 30 minutes, putting the ball-milling tank into a planetary ball mill, rotating at 270 r/min, inverting at 40 Hz, and ball-milling and mixing for 60 minutes.
And step three, mixing the mixed powder and the pressure-sensitive adhesive according to the weight ratio of 1:1.3 to prepare cladding powder, coating the cladding powder on the surface of a Q235 steel substrate, wherein the coating thickness is 1 cm, the coating width is 0.9 cm, and drying for 1.8 h at 130 ℃.
Step four, heating the cladding powder by adopting plasma beams for cladding, wherein the technological parameters are set as follows: argon mixed with 10% nitrogen is used as protective gas and ionized gas, the cladding parameter current is 150A, the working voltage is 35V, the scanning speed is 4.5 mm/s, and the flow of the mixture used as the protective gas is 1 m3H, the flow rate of the mixture as ionized gas is 1.1 m3The distance of the nozzle from the surface to be treated is 1 cm.
As a result, it was found that CrN, AlN, TiN, Cr were formed on the surface of the Q195 substrate7C3The strengthened AlCoCrCuNiTi high-entropy alloy coating has the advantages that the cladding layer is completely metallurgically bonded with the base material, the coating is smooth in appearance and basically free of defects such as air holes and cracks, the thickness of the coating is about 470 mu m, and the wear resistance is improved by 5.3 times.
Example 3:
selecting the surface of Q215 steel to be clad as a matrix, pretreating the surface of the low-carbon steel matrix, polishing the surface of the matrix to be clad by using a grinding wheel or abrasive paper to remove rust and oxides, and removing oil stains on the surface of the matrix by using alcohol or acetone.
Step two, mixing Ni-Cr-B-Si, Co-Cr-B-Si, Cu, Al and Ti according to a certain proportion to form mixed powder, and performing ball milling and mixing by using a ball mill, wherein the particle size of the used powder is 40-280 mu m, the mass percentages of the components of Ni-Cr-B-Si are 15-18 of Cr, 2.5-4.5 of B, 3-4.5 of Si, 0.6-1 of C and the balance of Ni; the mass percentages of the components of Co-Cr-B-Si are 15-18% of Cr, 2.5-4.5% of B, 3-4.5% of Si, 0.6-1% of C and the balance of Co; the purities of the Cu powder and the Al powder are both higher than 99.5%; the purity of the Ti powder is higher than 99 percent; the mixed powder comprises the following components in percentage by mass: 30:30:22:9:9. Ball-milling and mixing the mixed powder by adopting a steel ball-milling tank, wherein the mass ratio of the grinding balls to the mixed powder is 3:1, sealing, opening a vacuum valve, vacuumizing for 40 minutes, putting the ball-milling tank into a planetary ball mill, rotating at 280 r/min, inverting at 30 Hz, and ball-milling and mixing for 50 minutes.
And step three, mixing the mixed powder and the pressure-sensitive adhesive according to the weight ratio of 1:1.5 to prepare cladding powder, coating the cladding powder on the surface of a Q215 steel substrate, wherein the coating thickness is 0.7 cm, the coating width is 1 cm, and drying for 1.5 h at 120 ℃.
Step four, heating the cladding powder by adopting plasma beams for cladding, wherein the technological parameters are set as follows: argon mixed with 12 percent of nitrogen is used as protective gas and ionized gas, the cladding parameter current is 100A, the working voltage is 20V, the scanning speed is 6 mm/s, and the flow of the mixed gas used as the protective gas is 0.8 m3H, the flow rate of the mixture as ionized gas is 0.9 m3The distance of the nozzle from the surface to be treated was 0.8 cm.
As a result, it was found that a coating of CrN, AlN, TiN, Cr was formed on the surface of the Q215 steel substrate7C3The enhanced AlCoCrCuNiTi high-entropy alloy coating has the advantages of smooth coating appearance, basically no defects such as pores, cracks and the like, low dilution rate, fine grain size of a cladding layer, high surface hardness, coating thickness of about 390 mu m and 5.1 times improvement of wear resistance.
Claims (3)
1. A method for preparing a nitride enhanced high-entropy alloy coating by plasma cladding is characterized by comprising the following process steps:
selecting a low-carbon steel surface to be clad as a matrix, pretreating the surface of the low-carbon steel matrix, polishing the surface of the matrix by using a grinding wheel or abrasive paper to remove oxides and rust, and removing oil stains on the surface of the matrix by using alcohol or acetone;
step two, mixing Ni-Cr-B-Si, Co-Cr-B-Si, Cu, Al and Ti according to a certain proportion to form mixed powder, and performing ball milling and mixing by using a ball mill, wherein the particle size of the used powder is 40-280 mu m; wherein the mass percentages of the components of Ni-Cr-B-Si are 15-18 of Cr, 2.5-4.5 of B, 3-4.5 of Si, 0.6-1 of C and the balance of Ni; the mass percentages of the components of Co-Cr-B-Si are 15-18% of Cr, 2.5-4.5% of B, 3-4.5% of Si, 0.6-1% of C and the balance of Co; the purities of the Cu powder and the Al powder are both higher than 99.5%; the purity of the Ti powder is higher than 99 percent; the mixed powder comprises the following components in percentage by mass: 24-30: 18-26: 8-12;
mixing the mixed powder and the pressure-sensitive adhesive according to the weight ratio of 1: 1.1-1.5 to prepare powder to be cladded, coating the powder on the surface of the low-carbon steel substrate, wherein the coating thickness is 0.7-1.3 cm, the width is 0.8-1 cm, and drying;
heating the cladding powder by adopting plasma beams for cladding, and cooling to obtain the wear-resistant coating; the specific process of cladding adopts argon mixed with 8-12% of nitrogen as protective gas and ionized gas, cladding parameter current is 100-150A, working voltage is 20-50V, scanning speed is 3-6 mm/s, and flow of mixed gas as protective gas is 0.8-1.4 m3The flow rate of the mixed gas as the ionized gas is 0.9-1.5 m3The distance between the nozzle and the surface to be treated is 0.8-1.2 cm.
2. The method for preparing the nitride enhanced high-entropy alloy coating by plasma cladding as claimed in claim 1, wherein: the ball milling and mixing are carried out by adopting a steel ball milling tank, wherein the mass ratio of milling balls to mixed powder is 2.4-3.0: 1, a vacuum valve is opened after sealing, vacuum pumping is carried out for 20-40 minutes, the ball milling tank is placed into a planetary ball mill, the rotating speed is 260-280 r/min, the inversion frequency is 30-50 Hz, and the ball milling and mixing time is 50-70 minutes.
3. The method for preparing the nitride enhanced high-entropy alloy coating by plasma cladding as claimed in claim 1, wherein: the drying process comprises the following steps: drying for 1.5-2 h at 120-140 ℃.
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| CN108048784B (en) * | 2018-01-04 | 2019-07-12 | 苏州科技大学 | A method for preparing nitride-enhanced high-entropy alloy coating by plasma thermal spraying |
| CN108118337B (en) * | 2018-01-04 | 2019-11-05 | 苏州科技大学 | A kind of method of plasma beam surface cladding TiN enhancing high entropy alloy coating |
| CN108118338B (en) * | 2018-01-04 | 2019-11-05 | 苏州科技大学 | A kind of method of high-frequency induction heating cladding TiC enhancing high entropy alloy coating |
| CN108118336B (en) * | 2018-01-04 | 2019-11-01 | 苏州科技大学 | A kind of method of plasma alloying carbide enhancing high entropy alloy coating |
| CN108130505B (en) * | 2018-01-04 | 2020-05-22 | 苏州科技大学 | Method for preparing high-entropy alloy coating by plasma beam alloying |
| CN109402578B (en) * | 2019-01-09 | 2020-10-09 | 苏州科技大学 | A method for preparing high-entropy alloy coatings based on reactive magnetron sputtering technology |
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2020
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