CN110344047B - In-situ synthesis low-pressure cold spraying CuNiCoFeCrAl2.8Preparation method of high-entropy alloy coating - Google Patents

In-situ synthesis low-pressure cold spraying CuNiCoFeCrAl2.8Preparation method of high-entropy alloy coating Download PDF

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CN110344047B
CN110344047B CN201910793715.XA CN201910793715A CN110344047B CN 110344047 B CN110344047 B CN 110344047B CN 201910793715 A CN201910793715 A CN 201910793715A CN 110344047 B CN110344047 B CN 110344047B
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entropy alloy
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alloy coating
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CN110344047A (en
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冯力
王贵平
安国升
杨效田
李文生
李俊琛
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Lanzhou University of Technology
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    • 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
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    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/082—Coating starting from inorganic powder by application of heat or pressure and heat without intermediate formation of a liquid in the layer
    • C23C24/085—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides

Abstract

The invention provides an in-situ synthesized low-pressure cold spraying CuNiCoFeCrAl2.8The preparation method of the high-entropy alloy coating comprises the following steps: uniformly mixing Cu powder, Ni powder, Co powder, Fe powder, Cr powder and Al powder to obtain powder for cold spraying, then cold spraying the powder to the surface of a metal matrix at low pressure to obtain a mixed powder coating, and then carrying out induction remelting in-situ synthesis to obtain CuNiCoFeCrAl2.8High entropy alloy coating. The invention uses low-pressure cold spraying technology to cold spray powder onto a substrate at low pressure for induction remelting and in-situ synthesis to obtain CuNiCoFeCrAl2.8The high-entropy alloy coating has sufficient alloying reaction, the microstructure of the mixed powder coating forms a high-entropy alloy structure with a body-centered cubic structure from pure metal in situ, the high-entropy alloy coating is formed, the structure is compact, the porosity is low, the high-entropy alloy structure is stable, impurities are few, the mechanical property is excellent, the strength is high, the hardness is high, the wear resistance and the corrosion resistance are good, and CuNiCoFeCrAl2.8The thickness of the high-entropy alloy coating is 100 mu m-3 mm, the preparation equipment is simple, and the process is convenient.

Description

In-situ synthesis low-pressure cold spraying CuNiCoFeCrAl2.8Preparation method of high-entropy alloy coating
Technical Field
The invention belongs to the technical field of cold spraying coating preparation and alloying, and particularly relates to in-situ synthesis low-pressure cold spraying CuNiCoFeCrAl2.8A preparation method of a high-entropy alloy coating.
Background
CuNiCoFeCrAl2.8The high-entropy alloy has excellent mechanical properties such as high strength, good corrosion resistance and excellent wear resistance. Therefore, the novel metal material is suitable for engineering applications in many fields, such as transportation, defense or nuclear and biomedical industries, etc., thereby causing great expectations in the industry. But using CuNiCoFeCrAl2.8The high-entropy alloy is used for preparing industrial parts,the material cost is too high. Therefore, people make the high-entropy alloy into powder and spray the powder on the surfaces of other metal substrates to form coatings, and the service performance and the service life of parts are improved by utilizing the characteristics of high strength, good wear resistance and good corrosion resistance.
The current preparation of CuNiCoFeCrAl2.8The method for preparing the high-entropy alloy coating mainly comprises the step of prefabricating CuNiCoFeCrAl by using a thermal spraying technology2.8Spraying the high-entropy alloy powder material on the surface of a matrix to prepare the CuNiCoFeCrAl2.8High entropy alloy coating. Preparation of CuNiCoFeCrAl Using thermal spray technique2.8High entropy alloy coating, heating and prefabricating CuNiCoFeCrAl by flame, plasma and other heat sources2.8The high-entropy alloy powder material is prepared by spraying a semi-molten powder material on the surface of a substrate to form a coating. In this process, CuNiCoFeCrAl is prefabricated2.8The high-entropy alloy powder material is easy to oxidize, and more oxide impurities are caused in the coating. When the powder material is heated by a heat source, the heat influence on the matrix is inevitably generated, and the negative influences of matrix oxidation, decarburization, phase change and the like are caused; in addition, the coating prepared by the thermal spraying technology has high porosity, and the thickness of the coating exceeds 500 mu m. Factors such as porosity, oxide impurities, oxidation of a substrate, thermal deformation of the substrate and the like can cause the mechanical property of the coating to be reduced, and the quality and the service life of the coating are influenced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an in-situ synthesized low-pressure cold spraying CuNiCoFeCrAl for overcoming the defects of the prior art2.8The preparation method of the high-entropy alloy coating uses a low-pressure cold spraying technology, Cu powder, Ni powder, Co powder, Fe powder, Cr powder and Al powder are mixed and then are sprayed on a substrate in a low-pressure cold spraying mode to obtain a mixed powder coating, then the mixed powder coating is subjected to induction remelting in-situ synthesis to obtain a CuNiCoFeCrAl2.8 high-entropy alloy coating, the alloying reaction is sufficient, a high-entropy alloy structure with a body-centered cubic (BCC) structure is formed in situ from pure metal in a microstructure of the mixed powder coating, the high-entropy alloy coating is formed, the structure is compact, the porosity is low, the high-entropy alloy structure of the high-entropy alloy coating is stable, the impurities are few, the mechanical property is excellent, and the high-entropy alloy coating has high strength and hardnessHigh wear resistance and good corrosion resistance, CuNiCoFeCrAl2.8The thickness of the high-entropy alloy coating is 100 mu m-3 mm, the required equipment is simple, and the process is convenient.
In order to solve the technical problems, the invention adopts the technical scheme that: a method for preparing a low-pressure cold-sprayed CuNiCoFeCrAl2.8 high-entropy alloy coating by in-situ synthesis comprises the following steps:
s1, uniformly mixing Cu powder, Ni powder, Co powder, Fe powder, Cr powder and Al powder to obtain powder for cold spraying; the powder for cold spraying is prepared from the following raw materials in percentage by mass: 15-20% of Cu powder, 13-18% of Ni powder, 13-18% of Co powder, 12-17% of Fe powder, 11-16% of Cr powder and the balance of Al powder; the Al powder is powder which is prepared by an atomization method and is in the shape of spheroidal particles; the Ni powder is powder prepared by an electrolytic method and is in the shape of irregular particles; the Cr powder is powder prepared by a crushing method and has irregular polygonal particle shape; the Co powder is powder prepared by an electrolytic method and is irregular-shaped particles; the Fe powder is powder prepared by an electrolytic method and is in the shape of irregular particles; the Cu powder is powder which is prepared by an electrolytic method and has the shape of dendritic particles;
s2, cold spraying the powder for cold spraying obtained in the S1 to the surface of a metal matrix at low pressure to obtain a mixed powder coating; the technological parameters of the low-pressure cold spraying are as follows: the working gas is compressed air, the carrier gas temperature is 540-580 ℃, the carrier gas pressure is 0.75-0.80 MPa, the spraying distance is 31-35 mm, and the spraying speed is 0.26-0.30 m/s;
s3, carrying out induction remelting in-situ synthesis on the mixed powder coating obtained in S2 to obtain CuNiCoFeCrAl2.8A high entropy alloy coating; the CuNiCoFeCrAl2.8The molar ratio of Cu, Ni, Co, Fe, Cr and Al in the high-entropy alloy coating is 1:1:1:1: 2.8; the process parameters of the induction remelting in-situ synthesis are as follows: the gap between the induction coil and the substrate is 4.1-4.4 mm, the heating temperature is 1250-1300 ℃, the heating power is 2.3-2.6 kW, the frequency is 175kHz, and the heating time is 31-34 s.
The invention selects Cu powder, Ni powder, Co powder, Fe powder, Cr powder and Al powderPreparation of CuNiCoFeCrAl as raw Material2.8The high-entropy alloy coating is easy to form a substitutional solid solution because the atomic radii of four elements of Ni, Co, Cr and Fe are close to each other. The crystal structure of metal Ni is FCC, the crystal structure of metal Co is FCC, the crystal structure of metal Cr is BCC, and the crystal structure of metal Fe is BCC at normal temperature. CuNiCoFeCrAl2.8The high-entropy alloy coating is based on four elements with close atomic radii of Ni, Co, C and Fe, and the four elements of Ni, Co, Cr and Fe form an FCC structure and a BCC structure which are mutually solid-dissolved. Al element and Cu element in CuNiCoFeCrAl2.8The high-entropy alloy coating belongs to an additive element. CuNiCoFeCrAl2.8The molar ratio of Cu, Ni, Co, Fe, Cr and Al in the high-entropy alloy coating is 1:1:1:1:1:2.8, and the Al element promotes CuNiCoFeCrAl2.8A single BCC structure is formed in the high-entropy alloy coating. In addition, the atomic radius of the Al element is larger than that of other five elements, and when the Al atom is dissolved in CuNiCoFeCrAl in a solid state2.8When the alloy is in a BCC structure in the high-entropy alloy coating, the lattice constant of the BCC structure is increased, the solid solution strengthening effect is achieved, and CuNiCoFeCrAl can be added2.8Hardness of high entropy alloy coating. The metal Cu has good plasticity, and Cu element is dissolved in CuNiCoFeCrAl in a solid way2.8When in a BCC structure in the high-entropy alloy coating, the CuNiCoFeCrAl alloy plays a role of increasing CuNiCoFeCrAl2.8And (3) the plasticity of the high-entropy alloy coating.
The powder for cold spraying is prepared from the following raw materials in percentage by mass: 15-20% of Cu powder, 13-18% of Ni powder, 13-18% of Co powder, 12-17% of Fe powder, 11-16% of Cr powder and the balance of Al powder, wherein the Ni powder is powder prepared by an electrolytic method and has irregular particle shape, and the content of the Ni powder is 13-18%. The Ni content in the cold spraying mixed powder can reach the in-situ synthesis of CuNiCoFeCrAl2.8The Ni content required by the high-entropy alloy coating. If the Ni content is too low, the Ni content in the mixed powder coating is low, after the mixed powder coating is remelted, Fe element, Co element and Cr element in the coating are segregated, intermetallic compounds or simple substance metals of Al element and Cu element are formed in the coating, and CuNiCoFeCrAl can not be synthesized in situ2.8High-entropy alloy coating. If the Ni content is too high, the Ni content in the mixed powder coating is high, after the mixed powder coating is remelted, Ni elements in the coating are segregated, intermetallic compounds of Ni elements, Al elements and Cu elements are formed in the coating, and CuNiCoFeCrAl cannot be synthesized in situ2.8High entropy alloy coating. The Ni powder is irregular in shape because the powder material prepared by the electrolytic method is generally dendritic, and the dendritic Ni powder is broken and decomposed to be irregular in the transportation process or the powder mixing process; the shape of the selected Ni powder is favorable for the Ni powder to generate plastic deformation in the cold spraying process and form mechanical combination with the surrounding particles in a locking way, the combination strength of the cold spraying mixed powder coating can be improved, the Ni content in the mixed powder coating can be ensured, and the remelting in-situ synthesis of the CuNiCoFeCrAl is achieved2.8The Ni content required by the high-entropy alloy coating. The content of Co powder is 13-18%, and the content of Co powder is in the range, so that the Co content in the cold spraying mixed powder can reach the in-situ synthesis of CuNiCoFeCrAl2.8The Co content required for high entropy alloy coatings. If the Co content is too low, the Co content in the mixed powder coating is low, after the mixed powder coating is remelted, Fe element, Ni element and Cr element in the coating are segregated, intermetallic compounds or simple substance metals of Al element and Cu element are formed in the coating, and CuNiCoFeCrAl can not be synthesized in situ2.8High entropy alloy coating. If the Co content is too high, the Co content in the mixed powder coating is high, after the mixed powder coating is remelted, the Co element in the coating is segregated, an intermetallic compound of the Co element, the Al element and the Cu element is formed in the coating, and the CuNiCoFeCrAl can not be synthesized in situ2.8High entropy alloy coating. The Co powder is irregular in shape because the powder material prepared by the electrolytic method is generally dendritic, and the dendritic Co powder is broken and decomposed to be irregular in the transportation process or the powder mixing process; the Co powder is selected, the shape of the Co powder is favorable for the Co powder to generate plastic deformation in the cold spraying process, the Co powder is locked with surrounding particles to form mechanical combination, the combination strength of a cold spraying mixed powder coating can be improved, the Co content in the mixed powder coating can be ensured, and the remelting in-situ synthesis of CuNiCoFeCrAl is achieved2.8The Co content required for high entropy alloy coatings. The content of the Cr powder is 11-16 percent, and the content of the Cr powder is in the range, so that the Cr content in the cold spraying mixed powder can reach the in-situ synthesis of CuNiCoFeCrAl2.8The Cr content required by the high-entropy alloy coating promotes the CuNiCoFeCrAl2.8And forming a BCC structure in the high-entropy alloy coating. If the Cr content is too low, the Cr content in the mixed powder coating is low, after the mixed powder coating is remelted, Ni element and Co element in the coating are segregated to form FCC structure, intermetallic compound or simple substance metal of Al element and Cu element is formed in the coating, and CuNiCoFeCrAl can not be synthesized in situ2.8High entropy alloy coating. If the Cr content is too high, the Cr content in the mixed powder coating is high, after the mixed powder coating is remelted, Cr element in the coating is segregated, an intermetallic compound of Cr element, Al element and Cu element is formed in the coating, and CuNiCoFeCrAl can not be synthesized in situ2.8High entropy alloy coating. The Cr powder is in an irregular polygonal shape, and can better promote the plastic deformation of other metal particles in the cold spraying mixed powder coating; the activation of the surface of the matrix and the surface of the mixed powder coating can be promoted, and the deposition efficiency of cold spraying mixed powder is increased; can ensure the Cr content in the mixed powder coating to achieve the remelting in-situ synthesis of CuNiCoFeCrAl2.8Cr content required by the high-entropy alloy coating. The content of the Fe powder is 12-17 percent, and the content of the Fe powder is in the range, so that the Fe content in the cold spraying mixed powder can reach the in-situ synthesis of CuNiCoFeCrAl2.8The Fe content required by the high-entropy alloy coating promotes the CuNiCoFeCrAl2.8And forming a BCC structure in the high-entropy alloy coating. If the Fe content is too low, the Fe content in the mixed powder coating is low, after the mixed powder coating is remelted, Ni element and Co element in the coating are segregated to form FCC structure, intermetallic compound or simple substance metal of Al element and Cu element is formed in the coating, and CuNiCoFeCrAl can not be synthesized in situ2.8High entropy alloy coating. If the Fe content is too high, the Fe content in the mixed powder coating is high, and after the mixed powder coating is remelted, Fe element in the coating is segregated to form Fe element, Al element and Cu element in the coatingIntermetallic compounds, not capable of in situ synthesis of CuNiCoFeCrAl2.8High entropy alloy coating. The Fe powder is irregular in shape because the powder material prepared by the electrolytic method is generally dendritic, and the dendritic Fe powder is broken and decomposed to be irregular in the transportation process or the powder mixing process; the shape of the selected Fe powder is favorable for the Fe powder to generate plastic deformation in the cold spraying process, the Fe powder is locked with surrounding particles to form mechanical combination, the combination strength of the cold spraying mixed powder coating can be improved, the Fe content in the mixed powder coating can be ensured, and the purpose of remelting and in-situ synthesizing CuNiCoFeCrAl is achieved2.8The Fe content required by the high-entropy alloy coating. The content of the Cu powder is 15-20 percent, and the content of the Cu powder is in the range, so that the Cu content in the cold spraying mixed powder can reach the in-situ synthesis of CuNiCoFeCrAl2.8The Cu content required by the high-entropy alloy coating. If the Cu content is too low, the Cu content in the mixed powder coating is low, after the mixed powder coating is remelted, Fe element, Ni element and Cr element in the coating are segregated, intermetallic compounds or simple substance metals of Al element and Fe element are formed in the coating, and CuNiCoFeCrAl can not be synthesized in situ2.8High entropy alloy coating. If the Cu content is too high, the Cu content in the mixed powder coating is high, after the mixed powder coating is remelted, Cu in the coating is segregated to form an FCC structure, intermetallic compounds of Co, Al and Cu are formed in the coating, and CuNiCoFeCrAl cannot be synthesized in situ2.8High entropy alloy coating. The Cu powder is prepared by an electrolytic method, is a powder material with the appearance of dendritic particles, and is favorable for plastic deformation of the Cu powder in the cold spraying process and is mutually locked with surrounding particles to form mechanical combination; can improve the bonding strength of the cold spraying mixed powder coating, can ensure the Cu content in the mixed powder coating, and achieves the remelting in-situ synthesis of CuNiCoFeCrAl2.8The Cu content required by the high-entropy alloy coating. The mol ratio of the Al powder content to other elements is about 2.8, and the Al powder content is in the range, so that the Al content in the cold spraying mixed powder can reach the in-situ synthesis of CuNiCoFeCrAl2.8The Al content required by the high-entropy alloy coating promotes the CuNiCoFeCrAl2.8And forming a BCC structure in the high-entropy alloy coating and performing solid solution strengthening. If the Al content is too low, the Al content in the mixed powder coating is low, after the mixed powder coating is remelted, Ni element and Cu element in the coating are segregated to form FCC structure, intermetallic compound or simple substance metal of Cr element and Cu element is formed in the coating, and CuNiCoFeCrAl can not be synthesized in situ2.8High entropy alloy coating. If the Al content is too high, the Al content in the mixed powder coating is high, after the mixed powder coating is remelted, Al element in the coating is segregated, intermetallic compounds of Al element, Cr element, Ni element and Fe element are formed in the coating, and CuNiCoFeCrAl can not be synthesized in situ2.8High entropy alloy coating. The Al powder is a powder material with a similar spherical shape prepared by an atomization method, and the hardness of the Al powder is suitable for preparing a cold spraying coating, so that the porosity of the cold spraying mixed powder coating can be reduced; the shape of the Al powder is beneficial to the Al powder to obtain higher speed in the cold spraying process, so that the Al powder is deposited on the surface of a substrate to form a coating, the Al content in the mixed powder coating can be ensured, and the remelting in-situ synthesis of CuNiCoFeCrAl is achieved2.8Al content required by high-entropy alloy coating.
The components and the shape of the material of the cold spraying powder can ensure that the thickness of a mixed powder coating is controlled between 100 mu m and 3 mm; in-situ synthesis of CuNiCoFeCrAl by induction remelting of mixed powder coating2.8The thickness of the high-entropy alloy coating is basically kept unchanged and is also 100 mu m-3 mm; in the method provided by the invention, the final in-situ synthesized CuNiCoFeCrAl is controlled by controlling the thickness of the mixed powder coating2.8u thickness of high entropy alloy coating, while the thickness of conventional high entropy alloy coating is no more than 500 μm, the CuNiCoFeCrAl of the invention2.8The thickness of the high-entropy alloy coating can be controlled to be 100 mu m-3 mm, and CuNiCoFeCrAl is added2.8Thickness selectivity of high-entropy alloy coating, increased thickness capable of increasing wear resistance, CuNiCoFeCrAl prepared by thermal spraying technology2.8High entropy alloy coating, CuNiCoFeCrAl if the thickness is more than 500 μm2.8The high-entropy alloy coating can be peeled off in a whole block due to the action of thermal stress, and the substrate cannot be protected. The CuNiCoFeCr of the inventionAl2.8The thickness of the high-entropy alloy coating can exceed 500 mu m, and long-term effective friction-resistant and corrosion-resistant protection is provided for a substrate.
And (3) carrying out induction remelting in-situ synthesis on the mixed powder coating obtained in the step S2, wherein after an alloying reaction is carried out, the atomic radii of the four elements, namely Ni, Co, Cr and Fe are close to each other, so that a substitutional solid solution is easily formed. Alloying is started when the mixed powder coating is remelted, and solid solution structures with FCC structures and BCC structures are formed on the basis of four elements of Ni, Co, Cr and Fe; CuNiCoFeCrAl2.8The molar ratio of Cu, Ni, Co, Fe, Cr and Al in the high-entropy alloy coating is 1:1:1:1:1:2.8, and the Al elements promote CuNiCoFeCrAl2.8A single BCC structure is formed in the high-entropy alloy coating. In addition, the atomic radius of the Al element is larger than that of other five elements, and when the Al atom is dissolved in CuNiCoFeCrAl in a solid state2.8When the alloy is in a BCC structure in the high-entropy alloy coating, the lattice constant of the BCC structure is increased, the solid solution strengthening effect is achieved, and CuNiCoFeCrAl can be added2.8Hardness of high entropy alloy coating. The metal Cu has good plasticity, and Cu element is dissolved in CuNiCoFeCrAl in a solid way2.8When in a BCC structure in the high-entropy alloy coating, the CuNiCoFeCrAl alloy plays a role of increasing CuNiCoFeCrAl2.8And (3) the plasticity of the high-entropy alloy coating.
Preferably, the powder for cold spraying in S1 is prepared from the following raw materials in percentage by mass: 18% of Cu powder, 16% of Ni powder, 16% of Co powder, 15% of Fe powder, 14% of Cr powder and the balance of Al powder.
Preferably, the mixing time in S1 is 6.5h to 7 h.
Preferably, the mixing in S1 is mechanically stirred and mixed.
Preferably, the particle size of the powder for cold spraying in S1 is 10 to 50 μm.
Preferably, the CuNiCoFeCrAl in S32.8The thickness of the high-entropy alloy coating is 100 mu m-3 mm.
Compared with the prior art, the invention has the following advantages:
1. the invention uses low-pressure cold spraying technology to mix Cu powder, Ni powder, Co powder, Fe powder, Cr powder and Al powder, and then the mixture is cold sprayed on a substrate at low pressure to obtain a mixed powder coating, and then the mixed powder coating is obtainedThen carrying out induction remelting in-situ synthesis on the mixed powder coating to obtain CuNiCoFeCrAl2.8A high entropy alloy coating; the alloying reaction in the mixed powder coating is sufficient, and the microstructure of the mixed powder coating forms CuNiCoFeCrAl with a Body Centered Cubic (BCC) structure from pure metal in situ2.8High entropy alloy structure, formed CuNiCoFeCrAl2.8The high-entropy alloy coating has compact structure and low porosity, and the high-entropy alloy coating has stable structure and less impurities. CuNiCoFeCrAl2.8The high-entropy alloy coating mainly comprises a BCC-structure solid solution structure, namely CuNiCoFeCrAl2.8The structure of the BCC structure in the high-entropy alloy coating is harder than that of the FCC structure, so that the hardness and strength of the coating can be improved by the single BCC structure; CuNiCoFeCrAl2.8The high-entropy alloy coating structure does not contain hard and brittle intermetallic compounds which can deteriorate the coating performance; these factors lead to CuNiCoFeCrAl2.8The high-entropy alloy coating has excellent mechanical properties, and has the characteristics of high strength, high hardness, and good wear resistance and corrosion resistance; the method needs simple equipment and is convenient in process.
2、CuNiCoFeCrAl2.8The components of the high-entropy alloy coating are convenient to adjust; the components of the required high-entropy alloy coating are different under different working conditions; according to the invention, when the mixed powder coating is prefabricated, the percentage content of each raw material can be adjusted according to the requirement, and the high-entropy alloy coating with different components can be finally prepared.
3. The current preparation of CuNiCoFeCrAl2.8The method for coating the high-entropy alloy mainly comprises the step of prefabricating CuNiCoFeCrAl by using a thermal spraying technology2.8Spraying the high-entropy alloy powder material on the surface of a matrix to prepare the CuNiCoFeCrAl2.8High entropy alloy coating. Preparation of CuNiCoFeCrAl Using thermal spray technique2.8High entropy alloy coating, heating and prefabricating CuNiCoFeCrAl by flame, plasma and other heat sources2.8The high-entropy alloy powder material is prepared by spraying a semi-molten powder material on the surface of a substrate to form a coating. In this process, CuNiCoFeCrAl is prefabricated2.8The high-entropy alloy powder material is easy to oxidize, and more oxide impurities are caused in the coating. When the powder material is heated by the heat source, the heat effect on the matrix is inevitably generated, which can causeNegative effects such as matrix oxidation, decarburization, phase change and the like; in addition, the coating prepared by the thermal spraying technology has high porosity, and the thickness of the coating exceeds 500 mu m. Factors such as porosity, oxide impurities, oxidation of a substrate, thermal deformation of the substrate and the like can cause the mechanical property of the coating to be reduced, and the quality and the service life of the coating are influenced. CuNiCoFeCrAl prepared by the method mentioned in the patent of the invention2.8High entropy alloy coating, less impurity, high density, CuNiCoFeCrAl2.8The thickness of the high-entropy alloy coating can be controlled to be 100 mu m-3 mm. CuNiCoFeCrAl2.8The atomic radius of four elements of Ni, Co, Cr and Fe in the high-entropy alloy coating is close to the size, and a substitutional solid solution is easily formed. Alloying is started when the mixed powder coating is remelted, and solid solution structures with FCC structures and BCC structures are formed on the basis of four elements of Ni, Co, Cr and Fe; CuNiCoFeCrAl2.8The molar ratio of Cu, Ni, Co, Fe, Cr and Al in the high-entropy alloy coating is 1:1:1:1:1:2.8, and the Al elements promote CuNiCoFeCrAl2.8A single BCC structure is formed in the high-entropy alloy coating. In addition, the atomic radius of the Al element is larger than that of other five elements, and when the Al atom is dissolved in CuNiCoFeCrAl in a solid state2.8When the alloy is in a BCC structure in the high-entropy alloy coating, the lattice constant of the BCC structure is increased, the solid solution strengthening effect is achieved, and CuNiCoFeCrAl can be added2.8Hardness of high entropy alloy coating. The metal Cu has good plasticity, and Cu element is dissolved in CuNiCoFeCrAl in a solid way2.8When in a BCC structure in the high-entropy alloy coating, the CuNiCoFeCrAl alloy plays a role of increasing CuNiCoFeCrAl2.8And (3) the plasticity of the high-entropy alloy coating. The CuNiCoFeCrAl of the invention2.8The thickness of the high-entropy alloy coating is 100-3 mm, the selectivity is strong and can exceed 500 mu m, and long-term effective friction-resistant and corrosion-resistant protection is provided for a substrate.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a microscopic morphology of a powder for cold spraying of example 1 of the present invention.
FIG. 2 is a micro-topography of the mixed powder coating of example 1 of the present invention.
FIG. 3 is an X-ray diffraction pattern of the mixed powder coating of example 1 of the present invention.
FIG. 4 is a CuNiCoFeCrAl of example 1 of the present invention2.8Microstructure topography of the high-entropy alloy coating.
FIG. 5 is a CuNiCoFeCrAl of example 1 of the present invention2.8X-ray diffraction pattern of high entropy alloy coating.
Detailed Description
Example 1
In situ Synthesis of Low pressure Cold spray CuNiCoFeCrAl of this example2.8The preparation method of the high-entropy alloy coating comprises the following steps:
s1, stirring and mixing Cu powder, Ni powder, Co powder, Fe powder, Cr powder and Al powder for 6.8 hours by a mechanical method, and uniformly mixing to obtain powder for cold spraying; the powder for cold spraying is prepared from the following raw materials in percentage by mass: 18% of Cu powder, 16% of Ni powder, 16% of Co powder, 15% of Fe powder, 14% of Cr powder and the balance of Al powder; the Al powder is powder which is prepared by an atomization method and is in the shape of spheroidal particles; the Ni powder is powder prepared by an electrolytic method and is in the shape of irregular particles; the Cr powder is powder prepared by a crushing method and has irregular polygonal particle shape; the Co powder is powder prepared by an electrolytic method and is irregular-shaped particles; the Fe powder is powder prepared by an electrolytic method and is in the shape of irregular particles; the Cu powder is powder which is prepared by an electrolytic method and has the shape of dendritic particles; the particle size of the powder for cold spraying is 10-50 mu m;
s2, cold spraying the powder for cold spraying obtained in the S1 to the surface of a 45 steel matrix at low pressure to obtain a mixed powder coating; the technological parameters of the low-pressure cold spraying are as follows: the working gas is compressed air, the carrier gas temperature is 565 ℃, the carrier gas pressure is 0.75MPa, the spraying distance is 33mm, and the spraying speed is 0.28 m/s;
s3, carrying out induction remelting in-situ synthesis on the mixed powder coating obtained in S2 to obtain CuNiCoFeCrAl with the thickness of 970 mu m2.8A high entropy alloy coating; the CuNiCoFeCrAl2.8The molar ratio of Cu, Ni, Co, Fe, Cr and Al in the high-entropy alloy coating is 1:1:1:1: 2.8; the process parameters of the induction remelting in-situ synthesis are as follows: the gap between the induction coil and the substrate is 4.3mm, and heating is performedThe temperature was 1270 ℃, the heating power was 2.5kW, the frequency was 175kHz, and the heating time was 33 s.
In this example, Cu powder, Ni powder, Co powder, Fe powder, Cr powder and Al powder were selected as raw materials to prepare CuNiCoFeCrAl2.8The high-entropy alloy coating is easy to form a substitutional solid solution because the atomic radii of four elements of Ni, Co, Cr and Fe are close to each other. The crystal structure of metal Ni is FCC, the crystal structure of metal Co is FCC, the crystal structure of metal Cr is BCC, and the crystal structure of metal Fe is BCC at normal temperature. CuNiCoFeCrAl2.8The high-entropy alloy coating is based on four elements with close atomic radii of Ni, Co, C and Fe, and the four elements of Ni, Co, Cr and Fe form an FCC structure and a BCC structure which are mutually solid-dissolved. Al element and Cu element in CuNiCoFeCrAl2.8The high-entropy alloy coating belongs to an additive element. When Al element with the mole ratio of about 2.8 to other five elements is added, the Al element promotes CuNiCoFeCrAl2.8A single BCC structure is formed in the high-entropy alloy coating. In addition, the atomic radius of the Al element is larger than that of other five elements, and when the Al atom is dissolved in CuNiCoFeCrAl in a solid state2.8When the alloy is in a BCC structure in the high-entropy alloy coating, the lattice constant of the BCC structure is increased, the solid solution strengthening effect is achieved, and CuNiCoFeCrAl can be added2.8Hardness of high entropy alloy coating. The metal Cu has good plasticity, and Cu element is dissolved in CuNiCoFeCrAl in a solid way2.8When in a BCC structure in the high-entropy alloy coating, the CuNiCoFeCrAl alloy plays a role of increasing CuNiCoFeCrAl2.8And (3) the plasticity of the high-entropy alloy coating.
And (3) carrying out induction remelting in-situ synthesis on the mixed powder coating obtained in the step S2, wherein after an alloying reaction is carried out, the atomic radii of the four elements, namely Ni, Co, Cr and Fe are close to each other, so that a substitutional solid solution is easily formed. Alloying is started when the mixed powder coating is remelted, and solid solution structures with FCC structures and BCC structures are formed on the basis of four elements of Ni, Co, Cr and Fe; CuNiCoFeCrAl2.8The molar ratio of Cu, Ni, Co, Fe, Cr and Al in the high-entropy alloy coating is 1:1:1:1:1:2.8, and the Al elements promote CuNiCoFeCrAl2.8A single BCC structure is formed in the high-entropy alloy coating. In addition, the atomic radius of the Al element is larger than that of the other five elements, and when the Al atom is dissolved in the solution CuNiCoFeCrAl2.8When the alloy is in a BCC structure in the high-entropy alloy coating, the lattice constant of the BCC structure is increased, the solid solution strengthening effect is achieved, and CuNiCoFeCrAl can be added2.8Hardness of high entropy alloy coating. The metal Cu has good plasticity, and Cu element is dissolved in CuNiCoFeCrAl in a solid way2.8When in a BCC structure in the high-entropy alloy coating, the CuNiCoFeCrAl alloy plays a role of increasing CuNiCoFeCrAl2.8And (3) the plasticity of the high-entropy alloy coating.
FIG. 1 is a micro-topography of a powder for cold spraying, FIG. 2 is a micro-topography of a mixed powder coating, FIG. 3 is an X-ray diffraction pattern of the mixed powder coating, and FIG. 4 is a CuNiCoFeCrAl2.8Microstructure morphology of high entropy alloy coating, FIG. 5 is CuNiCoFeCrAl2.8X-ray diffraction pattern of high entropy alloy coating. As can be seen from FIG. 1, the morphology of Al powder is a powder of spheroidal particles; the shape of the Ni powder is irregular particle powder; the Cr powder is powder with irregular polygonal particles; the morphology of the Co powder is irregular particle powder; the shape of the Fe powder is irregular particle powder; the Cu powder is in the shape of dendritic particles. The components and the morphology of the material of the cold spraying powder of the embodiment can ensure that the thickness of the mixed powder coating is 970 μm; in-situ synthesis of CuNiCoFeCrAl by induction remelting of mixed powder coating2.8The thickness of the high-entropy alloy coating is kept unchanged basically and is 970 mu m; in the method provided by the invention, the final in-situ synthesized CuNiCoFeCrAl is controlled by controlling the thickness of the mixed powder coating2.8Thickness of the high entropy alloy coating. As can be seen from FIG. 2, the mixed powder coating has a compact structure, no obvious holes and cracks, plastic deformation of metal particles of each metal powder occurs, and there are obvious boundaries between the metal particles, according to the measurement, the porosity of the mixed powder coating is 0.4%, the bonding strength is 30Mpa, the coating hardness is 109HV, it can be determined that the metal particles in the coating do not oxidize and diffuse, the phase structure is still the phase structure of the elementary metal, and CuNiCoFeCrAl is obtained by induction remelting in-situ synthesis, corresponding to the X-ray diffraction pattern of the mixed powder coating in FIG. 32.8High entropy alloy coating, CuNiCoFeCrAl2.8The X-ray diffraction pattern of the high-entropy alloy coating is shown in FIG. 5.As shown in FIG. 4, CuNiCoFeCrAl is synthesized in situ by elemental metal elements2.8The high-entropy alloy is alloyed on the surface of a 45 steel matrix after induction remelting in-situ synthesis, so that the structure of metal alloying is more compact, the structural structure is better homogenized, all metal elements are uniformly diffused, and the obtained CuNiCoFeCrAl2.8The alloying reaction in the high-entropy alloy coating is sufficient, and the microstructure is changed from a pure metal structure to CuNiCoFeCrAl with a Body Centered Cubic (BCC) structure2.8High entropy alloy structure, induction remelting in situ synthesized CuNiCoFeCrAl2.8The high-entropy alloy coating has high density and few defects, and achieves the effect of in-situ synthesis alloying, and as can be seen from figure 2, the mixed powder coating after low-pressure cold spraying is all elemental metal elements; as can be seen from FIG. 4, after the mixed powder coating is remelted, the elemental metal elements in the mixed powder coating synthesize CuNiCoFeCrAl with Body Centered Cubic (BCC) structure in situ2.8Compared with the mixed powder coating obtained after low-pressure cold spraying, the high-entropy alloy structure has the advantages of improved performance, 0 percent of porosity, 140MPa of bonding strength, 602HV of coating hardness and CuNiCoFeCrAl2.8The thickness of the high-entropy alloy coating is 970 mu m. CuNiCoFeCrAl2.8The thickness of the high-entropy alloy coating is 970 mu m. The thickness of the NiCoCrAlCu high-entropy alloy coating of the embodiment is 970 mu m, and CuNiCoFeCrAl is added2.8Thickness selectivity of high-entropy alloy coating, increased thickness capable of increasing wear resistance, CuNiCoFeCrAl prepared by thermal spraying technology2.8High entropy alloy coating, CuNiCoFeCrAl if the thickness is more than 500 μm2.8The high-entropy alloy coating can be peeled off in a whole block due to the action of thermal stress, and the substrate cannot be protected. CuNiCoFeCrAl of the present example2.8The thickness of the high-entropy alloy coating is 100-3 mm, the selectivity is strong and can exceed 500 mu m, and long-term effective friction-resistant and corrosion-resistant protection is provided for a substrate.
CuNiCoFeCrAl prepared by adopting high-entropy alloy powder thermal spraying2.8The high-entropy alloy coating has the porosity of 1-3.5 percent and large porosity, the bonding strength of the coating and a metal matrix is only 50-80 Mpa, the mechanical property of the coating is poor, and the semi-molten alloy coating is prepared by using a thermal spraying technologyThe melted high-entropy alloy powder is sprayed to the surface of a metal matrix, in the process, the high-entropy alloy powder is easy to oxidize, so that more oxide impurities are caused in the formed coating, and when the high-entropy alloy powder is heated by a heat source, the heat influence on the matrix is inevitable, so that negative effects such as oxidation, decarburization and phase change of the matrix are caused; and the porosity is high, and factors such as porosity, oxide impurities, matrix oxidation, matrix decarburization and the like can cause the reduction of the mechanical property of the coating and influence the quality and the service life of the coating.
Example 2
In situ Synthesis of Low pressure Cold spray CuNiCoFeCrAl of this example2.8The preparation method of the high-entropy alloy coating comprises the following steps:
s1, stirring and mixing Cu powder, Ni powder, Co powder, Fe powder, Cr powder and Al powder for 6.5 hours by a mechanical method, and uniformly mixing to obtain powder for cold spraying; the powder for cold spraying is prepared from the following raw materials in percentage by mass: 15% of Cu powder, 13% of Ni powder, 13% of Co powder, 17% of Fe powder, 16% of Cr powder and the balance of Al powder; the Al powder is powder which is prepared by an atomization method and is in the shape of spheroidal particles; the Ni powder is powder prepared by an electrolytic method and is in the shape of irregular particles; the Cr powder is powder prepared by a crushing method and has irregular polygonal particle shape; the Co powder is powder prepared by an electrolytic method and is irregular-shaped particles; the Fe powder is powder prepared by an electrolytic method and is in the shape of irregular particles; the Cu powder is powder which is prepared by an electrolytic method and has the shape of dendritic particles; the particle size of the powder for cold spraying is 10-50 mu m;
s2, cold spraying the powder for cold spraying obtained in the S1 to the surface of a 45 steel matrix at low pressure to obtain a mixed powder coating; the technological parameters of the low-pressure cold spraying are as follows: the working gas is compressed air, the carrier gas temperature is 540 ℃, the carrier gas pressure is 0.76MPa, the spraying distance is 31mm, and the spraying speed is 0.26 m/s;
s3, carrying out induction remelting in-situ synthesis on the mixed powder coating obtained in S2 to obtain CuNiCoFeCrAl with the thickness of 870 mu m2.8A high entropy alloy coating; the CuNiCoFeCrAl2.8Molar ratio of Cu, Ni, Co, Fe, Cr and Al in high-entropy alloy coatingIs 1:1:1:1: 2.8; the process parameters of the induction remelting in-situ synthesis are as follows: the gap between the induction coil and the 45 steel matrix is 4.1mm, the heating temperature is 1250 ℃, the heating power is 2.3kW, the frequency is 175kHz, and the heating time is 34 s.
CuNiCoFeCrAl prepared in this example2.8The porosity of the coating is 0%, the bonding strength is 141MPa, the coating hardness is 624HV, and the CuNiCoFeCrAl2.8Has a thickness of 870 μm.
Example 3
In situ Synthesis of Low pressure Cold spray CuNiCoFeCrAl of this example2.8The preparation method of the high-entropy alloy coating comprises the following steps:
s1, stirring and mixing Cu powder, Ni powder, Co powder, Fe powder, Cr powder and Al powder for 7 hours by a mechanical method, and uniformly mixing to obtain powder for cold spraying; the powder for cold spraying is prepared from the following raw materials in percentage by mass: 20% of Cu powder, 18% of Ni powder, 18% of Co powder, 12% of Fe powder, 11% of Cr powder and the balance of Al powder; the Al powder is powder which is prepared by an atomization method and is in the shape of spheroidal particles; the Ni powder is powder prepared by an electrolytic method and is in the shape of irregular particles; the Cr powder is powder prepared by a crushing method and has irregular polygonal particle shape; the Co powder is powder prepared by an electrolytic method and is irregular-shaped particles; the Fe powder is powder prepared by an electrolytic method and is in the shape of irregular particles; the Cu powder is powder which is prepared by an electrolytic method and has the shape of dendritic particles; the particle size of the powder for cold spraying is 10-50 mu m;
s2, cold spraying the powder for cold spraying obtained in the S1 to the surface of a 45 steel matrix at low pressure to obtain a mixed powder coating; the technological parameters of the low-pressure cold spraying are as follows: the working gas is compressed air, the carrier gas temperature is 580 ℃, the carrier gas pressure is 0.78MPa, the spraying distance is 35mm, and the spraying speed is 0.30 m/s;
s3, carrying out induction remelting in-situ synthesis on the mixed powder coating obtained in S2 to obtain CuNiCoFeCrAl with the thickness of 2mm2.8A high entropy alloy coating; the CuNiCoFeCrAl2.8The molar ratio of Cu, Ni, Co, Fe, Cr and Al in the high-entropy alloy coating is 1:1:1:1: 2.8; the induction remelting in-situ synthesized process parameterThe number is as follows: the gap between the induction coil and the 45 steel matrix is 4.4mm, the heating temperature is 1300 ℃, the heating power is 2.5kW, the frequency is 175kHz, and the heating time is 31 s.
CuNiCoFeCrAl prepared in this example2.8The porosity of the high-entropy alloy coating is 0%, the bonding strength is 139MPa, the coating hardness is 592HV, and the CuNiCoFeCrAl2.8The thickness of the high-entropy alloy coating is 2 mm.
Example 4
In situ Synthesis of Low pressure Cold spray CuNiCoFeCrAl of this example2.8The preparation method of the high-entropy alloy coating comprises the following steps:
s1, stirring and mixing Cu powder, Ni powder, Co powder, Fe powder, Cr powder and Al powder for 6.6 hours by a mechanical method, and uniformly mixing to obtain powder for cold spraying; the powder for cold spraying is prepared from the following raw materials in percentage by mass: 11% of Cu powder, 8% of Al powder, 14% of Ni powder, 14% of Cr powder, 23% of Ti powder and the balance of Si powder; the Al powder is powder which is prepared by an atomization method and is in the shape of spheroidal particles; the Ni powder is powder prepared by an electrolytic method and is in the shape of irregular particles; the Cr powder is powder prepared by a crushing method and has irregular polygonal particle shape; the Co powder is powder prepared by an electrolytic method and is irregular-shaped particles; the Fe powder is powder prepared by an electrolytic method and is in the shape of irregular particles; the Cu powder is powder which is prepared by an electrolytic method and has the shape of dendritic particles; the particle size of the powder for cold spraying is 10-50 mu m;
s2, cold spraying the powder for cold spraying obtained in the S1 to the surface of a 45 steel matrix at low pressure to obtain a mixed powder coating; the technological parameters of the low-pressure cold spraying are as follows: the working gas is compressed air, the carrier gas temperature is 540 ℃, the carrier gas pressure is 0.79MPa, the spraying distance is 32mm, and the spraying speed is 0.27 m/s;
s3, carrying out induction remelting in-situ synthesis on the mixed powder coating obtained in S2 to obtain CuNiCoFeCrAl with the thickness of 3mm2.8A high entropy alloy coating; the CuNiCoFeCrAl2.8The molar ratio of Cu, Ni, Co, Fe, Cr and Al in the high-entropy alloy coating is 1:1:1:1: 2.8; the process parameters of the induction remelting in-situ synthesis are as follows: an induction coil andthe gap of the 45 steel matrix is 4.2mm, the heating temperature is 1260 ℃, the heating power is 2.4kW, the frequency is 175kHz, and the heating time is 32 s.
CuNiCoFeCrAl prepared in this example2.8The porosity of the high-entropy alloy coating is 0%, the bonding strength is 143MPa, the coating hardness is 605HV, and CuNiCoFeCrAl2.8The thickness of the high-entropy alloy coating is 3 mm.
Example 5
In situ Synthesis of Low pressure Cold spray CuNiCoFeCrAl of this example2.8The preparation method of the high-entropy alloy coating comprises the following steps:
s1, stirring and mixing Cu powder, Ni powder, Co powder, Fe powder, Cr powder and Al powder for 6.7 hours by a mechanical method, and uniformly mixing to obtain powder for cold spraying; the powder for cold spraying is prepared from the following raw materials in percentage by mass: 19% of Cu powder, 17% of Ni powder, 17% of Co powder, 13% of Fe powder, 12% of Cr powder and the balance of Al powder; the Al powder is powder which is prepared by an atomization method and is in the shape of spheroidal particles; the Ni powder is powder prepared by an electrolytic method and is in the shape of irregular particles; the Cr powder is powder prepared by a crushing method and has irregular polygonal particle shape; the Co powder is powder prepared by an electrolytic method and is irregular-shaped particles; the Fe powder is powder prepared by an electrolytic method and is in the shape of irregular particles; the Cu powder is powder which is prepared by an electrolytic method and has the shape of dendritic particles; the particle size of the powder for cold spraying is 10-50 mu m;
s2, cold spraying the powder for cold spraying obtained in the S1 to the surface of a 45 steel matrix at low pressure to obtain a mixed powder coating; the technological parameters of the low-pressure cold spraying are as follows: the working gas is compressed air, the carrier gas temperature is 580 ℃, the carrier gas pressure is 0.8MPa, the spraying distance is 34mm, and the spraying speed is 0.29 m/s;
s3, carrying out induction remelting in-situ synthesis on the mixed powder coating obtained in S2 to obtain CuNiCoFeCrAl with the thickness of 1 mu m2.8A high entropy alloy coating; the CuNiCoFeCrAl2.8The molar ratio of Cu, Ni, Co, Fe, Cr and Al in the high-entropy alloy coating is 1:1:1:1: 2.8; the process parameters of the induction remelting in-situ synthesis are as follows: the gap between the induction coil and the 45 steel substrate is 4.3mm, the heating temperature is 1290 ℃, the heating power is 2.6kW, the frequency is 175kHz, and the heating time is 33 s.
CuNiCoFeCrAl prepared in this example2.8The porosity of the high-entropy alloy coating is 0%, the bonding strength is 140MPa, the coating hardness is 597HV, CuNiCoFeCrAl2.8The thickness of the high-entropy alloy coating is 1 mu m.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.

Claims (2)

1. In-situ synthesis low-pressure cold spraying CuNiCoFeCrAl2.8The preparation method of the high-entropy alloy coating is characterized by comprising the following steps:
s1, uniformly mixing Cu powder, Ni powder, Co powder, Fe powder, Cr powder and Al powder to obtain powder for cold spraying; the powder for cold spraying is prepared from the following raw materials in percentage by mass: 15-20% of Cu powder, 13-18% of Ni powder, 13-18% of Co powder, 12-17% of Fe powder, 11-16% of Cr powder and the balance of Al powder; the Al powder is powder which is prepared by an atomization method and is in the shape of spheroidal particles; the Ni powder is powder prepared by an electrolytic method and is in the shape of irregular particles; the Cr powder is powder prepared by a crushing method and has irregular polygonal particle shape; the Co powder is powder prepared by an electrolytic method and is irregular-shaped particles; the Fe powder is powder prepared by an electrolytic method and is in the shape of irregular particles; the Cu powder is powder which is prepared by an electrolytic method and has the shape of dendritic particles; the mixing is carried out by stirring and mixing by a mechanical method; the mixing time is 6.5 to 7 hours; the particle size of the powder for cold spraying is 10-50 mu m;
s2, cold spraying the powder for cold spraying obtained in the S1 to the surface of a metal matrix at low pressure to obtain a mixed powder coating; the technological parameters of the low-pressure cold spraying are as follows: the working gas is compressed air, the carrier gas temperature is 540-580 ℃, the carrier gas pressure is 0.75-0.80 MPa, the spraying distance is 31-35 mm, and the spraying speed is 0.26-0.30 m/s;
s3, carrying out induction remelting in-situ synthesis on the mixed powder coating obtained in S2 to obtain CuNiCoFeCrAl2.8A high entropy alloy coating; the CuNiCoFeCrAl2.8The molar ratio of Cu, Ni, Co, Fe, Cr and Al in the high-entropy alloy coating is 1:1:1:1:1:2.8, and the Al element promotes CuNiCoFeCrAl2.8A single BCC structure is formed in the high-entropy alloy coating; the process parameters of the induction remelting in-situ synthesis are as follows: the gap between the induction coil and the matrix is 4.1-4.4 mm, the heating temperature is 1250-1300 ℃, the heating power is 2.3-2.6 kW, the frequency is 175kHz, and the heating time is 31-34 s; the CuNiCoFeCrAl2.8The thickness of the high-entropy alloy coating is 100 mu m-3 mm.
2. The in situ synthesized low pressure cold spray CuNiCoFeCrAl as claimed in claim 12.8The preparation method of the high-entropy alloy coating is characterized in that the powder for cold spraying in S1 is prepared from the following raw materials in percentage by mass: 18% of Cu powder, 16% of Ni powder, 16% of Co powder, 15% of Fe powder, 14% of Cr powder and the balance of Al powder.
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