CN111455301B - Wear-resistant corrosion-resistant high-entropy alloy gradient composite coating of outer cylinder of measurement-while-drilling instrument - Google Patents
Wear-resistant corrosion-resistant high-entropy alloy gradient composite coating of outer cylinder of measurement-while-drilling instrument Download PDFInfo
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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
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- 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
- C23C4/073—Metallic material containing MCrAl or MCrAlY alloys, where M is nickel, cobalt or iron, with or without non-metal elements
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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
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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
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Abstract
The invention belongs to the technical field of coatings. In particular to a wear-resistant corrosion-resistant high-entropy alloy gradient composite coating for an outer cylinder of a Measurement While Drilling (MWD) instrument. The gradient composite coating is provided with a bonding layer, a first transition layer, a second transition layer and a working layer in sequence from a substrate to the surface; spraying NiCrAl composite powder on the bonding layer; spraying NiCrAl composite powder and mixed powder consisting of TiN powder and high-entropy alloy powder on the transition layer; and spraying mixed powder consisting of TiN powder and high-entropy alloy powder on the working layer. The method adopts NiCrAl composite powder, TiN powder and high-entropy alloy powder materials to carry out component gradient design, so that the physical and chemical properties and the organizational structure of the coating are continuously transited, the internal stress of the coating is effectively reduced, the hardness, the strength, the wear resistance and the corrosion resistance of the surface coating of the outer cylinder of the measurement-while-drilling instrument are greatly improved, and the service life of the coating is prolonged.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a wear-resistant corrosion-resistant high-entropy alloy gradient composite coating for an outer cylinder of a Measurement While Drilling (MWD) instrument.
Background
The copper alloy has excellent electrical conductivity, thermal conductivity, formability and plasticity; the electrode potential is positive, has good corrosion resistance, is commonly used in high temperature resistant working conditions such as continuous casting crystallizer, blast furnace tuyere, cold converter oxygen lance nozzle, ion heating nozzle, billet hot cutting torch cutting nozzle and the like, but the wear resistance of copper alloy is poor, and surface strengthening treatment is often required in engineering application, so that the wear is reduced, and the service life of parts is prolonged.
The high-entropy alloy is a new material which is developed rapidly in the field of metal materials in recent years, and has excellent mechanical properties and functional properties due to the thermodynamic high-entropy effect, the structural lattice distortion effect, the kinetic delayed diffusion effect and the performance 'cocktail' effect, and particularly the high-entropy alloy composite material developed in recent years is particularly outstanding in the aspects of corrosion resistance, wear resistance, high temperature resistance and the like, so that the high-entropy alloy and the composite material thereof are gradually used as alternative materials for preparing excellent alloy coatings. However, the high-entropy alloy coating still has a lot of blanks in the aspects of system selection, function design, process optimization, mechanism research and the like, wherein the laser cladding single-pass cladding width in the high-entropy alloy coating is too small, the achievement of good 'lap joint' between cladding passes is a key point for preparing a large-area cladding layer, and meanwhile, the local temperature rise is easy to generate thermal stress and the like and needs to be paid important attention; the magnetron sputtering is difficult to prepare a large thick coating; the bond strength of the thermal sprayed coating to the substrate is insufficient.
The outer cylinder of a Measurement While Drilling (MWD) instrument is usually made of beryllium bronze, and along with the development of unconventional oil fields, the MWD instrument plays an important role in the type of Drilling construction. However, due to extremely severe working conditions in the drilling process, when the MWD instrument is used, the outer cylinder of the MWD instrument is punctured due to erosion of drilling fluid to the outer cylinder and abrasion of sand particles to the outer cylinder, so that the drilling operation period and the production cost are seriously influenced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the erosion and abrasion of the drilling fluid to the outer cylinder of the measurement while drilling instrument, the wear-resistant corrosion-resistant high-entropy alloy gradient composite coating of the outer cylinder of the measurement while drilling instrument is provided, the internal stress of the coating can be effectively reduced, the hardness, the strength, the wear resistance and the corrosion resistance of the surface coating of the outer cylinder of the measurement while drilling instrument are greatly improved, and the service life of the coating is prolonged.
The technical scheme of the invention is as follows:
an abrasion-resistant corrosion-resistant high-entropy alloy gradient composite coating of an outer cylinder of a measurement-while-drilling instrument is sequentially provided with a bonding layer, a first transition layer, a second transition layer and a working layer from a substrate to the surface.
Wherein the bonding layer is composed of NiCrAl composite powder; the working layer consists of TiN powder and high-entropy alloy powder; the first transition layer consists of NiCrAl composite powder and metal-ceramic composite powder (TiN powder and high-entropy alloy powder) with the same components as the working layer; the second transition layer is composed of NiCrAl composite powder and metal-ceramic composite powder (TiN powder and high-entropy alloy powder) having the same composition as the working layer.
In the NiCrAl composite powder, the content of Cr is 6-18 wt%, the content of Al is 5-10 wt%, and the balance is Ni, wherein the average particle size of the NiCrAl composite powder is 38-63 mu m;
TiN powder having an average particle diameter of 18 to 43 μm; the average grain diameter of the high-entropy alloy powder is 45-106 mu m.
The method selects AlCoCrFeNiTi high-entropy alloy powder, and the content of the added high-entropy alloy powder in the working layer accounts for 10-30 wt% of the total mass of the TiN powder and the high-entropy alloy powder.
In the first transition layer, the mass ratio of the NiCrAl composite powder to the mixture of the TiN powder and the high-entropy alloy powder is 3 (1.5-2.5);
in the second transition layer, the mass ratio of the NiCrAl composite powder to the mixture of the TiN powder and the high-entropy alloy powder is (1.5-2.5): 3.
The thicknesses of the bonding layer, the first transition layer, the second transition layer and the working layer are respectively 30-50 microns, 50-80 microns and 100-150 microns.
The base material is beryllium bronze, the bonding layer material is NiCrAl composite powder, the ceramic material is TiN powder, the high-entropy alloy is AlCoCrFeNiTi high-entropy alloy powder, the atomic radiuses of elements such as Cu, Fe, Co, Ni and Cr are similar, and a BCC or FCC structure is easy to form; the Al atom has larger radius, thus easily inducing lattice distortion and forming an amorphous phase; the Ti element is added, so that the comprehensive performance of the coating can be greatly improved under the influence of the high-entropy alloy 'cocktail effect'.
The components of the material are continuously changed in a gradient manner from the transition layer to the working layer, the change trend of the thermal expansion coefficient of the material is mild, the internal stress between coatings, particularly between the coatings and the matrix, can be reduced, and the bonding strength of the coatings and the outer cylinder of the measurement-while-drilling instrument is improved, so that the thermal shock resistance of the gradient coating is greatly improved. The friction coefficient of the obtained gradient coating is 0.3-0.5, the microhardness is 870-1100 HV, the bonding strength of the coating is 36-40 MPa, and the thermal shock frequency of failure of the coating is not less than 200 times under the conditions of 400 ℃ and water quenching.
The preparation method of the gradient composite coating comprises the following steps:
(1) preparing mixed powder of each layer: weighing NiCrAl powder, high-entropy alloy powder and TiN powder according to the mass ratio of the powder in each layer, respectively putting the NiCrAl powder, the high-entropy alloy powder and the TiN powder into a ball milling tank, adding ethanol, ball milling, vacuum drying, grinding and sieving, then adding a polyvinyl alcohol solution, vacuum drying, grinding and sieving, and preparing mixed powder;
the method adopts wet ball milling, the ball milling medium is ethanol, the milling balls are zirconia ceramic balls, the ratio of the balls to the material to the ethanol is 1:1: 0.8-1.2, and the total addition amount does not exceed 2/3 of the volume of a ball milling tank.
(2) Treating the surface of a substrate: polishing, cleaning and sandblasting the surface of the base material for coarsening;
(3) preheating a matrix: preheating the substrate treated in the step (2) by using flame of a plasma spray gun (150-240 ℃);
(4) spraying a gradient coating: firstly spraying a NiCrAl bonding layer with the thickness of 30-50 mu m, and then respectively spraying mixed powder of a first transition layer and a second transition layer with the thickness of 50-80 mu m; and finally spraying the mixed powder of the working layer, wherein the thickness is 100-150 mu m.
(5) And (3) post-treatment of the coating: the vacuum heat treatment is adopted for the sprayed sample, so that the thermal stress in the coating can be reduced, and the thermal shock resistance of the coating is obviously improved.
The invention designs four layers of coatings, the materials of the bonding layer are gradually reduced from the substrate to the surface layer, the materials of the ceramic layer are continuously increased, and the thermal stress generated between the ceramic coating and the metal substrate due to the mismatching of the thermal expansion coefficients is greatly relieved due to the design because the linear expansion coefficient of the bonding layer is between the substrate and the working layer.
The invention sprays two layers of NiCrAl composite powder, TiN powder and high-entropy alloy powder with different composition ratios, the two layers are transition layers, and the two layers can generate larger compressive stress when undergoing the expansion of nitride, so that the nitride gradient layer buckles the coating and does not leave the matrix, and the coating is not easy to fall off. The coating can work at higher temperature and steeper temperature gradient, and has good heat insulation effect and anti-stripping capability.
The invention has the beneficial effects that:
(1) the high-entropy alloy gradient composite coating meets the excellent performance of the surface of the outer cylinder of the measurement-while-drilling instrument, and the thermal shock resistance of the coating is good.
(2) The component gradual change structure designed by the invention greatly relieves the thermal stress generated between the ceramic coating and the metal substrate due to the mismatching of the thermal expansion coefficients, improves the bonding strength between the coating and the substrate, and effectively solves the problem that the coating is easy to crack.
(3) According to the invention, the high-entropy alloy powder is added into the ceramic coating material, so that the strength, hardness, wear resistance and corrosion resistance of the coating can be better improved, and the service life of the outer cylinder of the measurement-while-drilling instrument is prolonged.
(4) The method has the advantages of simple process steps, good repeatability, high preparation efficiency and high economic and practical applicability.
Drawings
FIG. 1 is a schematic structural diagram of a gradient composite coating.
Detailed Description
The present invention is further described below with reference to examples, but is not limited thereto.
Example 1:
the wear-resistant corrosion-resistant high-entropy alloy gradient composite coating of the outer cylinder of the measurement-while-drilling instrument is sequentially provided with a bonding layer, a first transition layer, a second transition layer and a working layer from a matrix to the surface, wherein the mass ratio of each component in each layer is as follows: the bonding layer is formed by spraying NiCrAl composite powder (10 wt% of Cr, 5 wt% of Al and the balance of Ni) and has the thickness of 50 mu m; spraying mixed powder consisting of TiN powder and 10% of high-entropy alloy powder on the working layer, wherein the thickness of the mixed powder is 150 microns; spraying mixed powder formed by mixing NiCrAl composite powder and powder with the same components as the working components according to the mass ratio of 2:1 on the first transition layer, wherein the thickness of the mixed powder is 80 mu m; and spraying mixed powder formed by mixing NiCrAl composite powder and powder with the same components as the working composition according to the mass ratio of 1:2 on the second transition layer, wherein the thickness of the mixed powder is 80 mu m.
The preparation method of the gradient composite coating comprises the following steps:
(1) preparing mixed powder of each layer:
(a) weighing NiCrAl powder, adding ethanol, ball-milling, vacuum drying, grinding, sieving, then adding a polyvinyl alcohol solution, vacuum drying, grinding, sieving, and preparing bonding layer powder;
(b) respectively weighing TiN powder and high-entropy alloy powder according to the mass ratio, adding ethanol, ball-milling, vacuum drying, grinding and sieving, then adding polyvinyl alcohol solution, vacuum drying, grinding and sieving to prepare working layer mixed powder;
(c) weighing NiCrAl powder, TiN powder and high-entropy alloy powder according to the mass ratio, adding ethanol, ball-milling, vacuum drying, grinding and sieving, then adding polyvinyl alcohol solution, vacuum drying, grinding and sieving to prepare transition layer mixed powder;
(2) treating the surface of a substrate: polishing, cleaning and sandblasting the surface of the base material for coarsening;
(3) preheating a matrix: preheating the substrate treated in the step (2) by using flame of a plasma spray gun (at 200 ℃);
(4) spraying a gradient coating: firstly spraying a NiCrAl bonding layer with the thickness of 30-50 mu m, and then respectively spraying mixed powder of a first transition layer and a second transition layer with the thickness of 50-80 mu m; and finally spraying the mixed powder of the working layer, wherein the thickness is 100-150 mu m.
(5) And (3) post-treatment of the coating: the vacuum heat treatment is adopted for the sprayed sample, so that the thermal stress in the coating can be reduced, and the thermal shock resistance of the coating is obviously improved.
The measured friction coefficient of the coating is 0.5, the microhardness is 870HV, the bonding strength of the coating is 36MPa, and the times of thermal shock of failure of the coating are 204 times under the conditions of water quenching at 400 ℃.
Example 2:
the wear-resistant corrosion-resistant high-entropy alloy gradient composite coating of the outer cylinder of the measurement-while-drilling instrument is sequentially provided with a bonding layer, a first transition layer, a second transition layer and a working layer from a matrix to the surface, wherein the mass ratio of each component in each layer is as follows: the bonding layer is formed by spraying NiCrAl composite powder (10 wt% of Cr, 5 wt% of Al and the balance of Ni) and has the thickness of 40 mu m; spraying mixed powder consisting of TiN powder and 20% of high-entropy alloy powder on the working layer, wherein the thickness of the mixed powder is 100 mu m; spraying mixed powder formed by mixing NiCrAl composite powder and powder with the same components as the working components according to the mass ratio of 6:5 on the first transition layer, wherein the thickness of the mixed powder is 60 mu m; and spraying mixed powder formed by mixing NiCrAl composite powder and powder with the same components as the working composition according to the mass ratio of 5:6 on the second transition layer, wherein the thickness of the mixed powder is 60 mu m.
The preparation method of the gradient composite coating refers to the method of example 1.
The measured friction coefficient of the coating is 0.4, the microhardness is 946HV, the bonding strength of the coating is 38MPa, and the thermal shock frequency of the failure of the coating is 216 times under the conditions of 400 ℃ and water quenching.
Example 3:
the wear-resistant corrosion-resistant high-entropy alloy gradient composite coating of the outer cylinder of the measurement-while-drilling instrument is sequentially provided with a bonding layer, a first transition layer, a second transition layer and a working layer from a matrix to the surface, wherein the mass ratio of each component in each layer is as follows: the bonding layer is formed by spraying NiCrAl composite powder (10 wt% of Cr, 5 wt% of Al and the balance of Ni) and has the thickness of 30 mu m; spraying mixed powder consisting of TiN powder and 30% of high-entropy alloy powder on the working layer, wherein the thickness of the mixed powder is 120 mu m; spraying mixed powder formed by mixing NiCrAl composite powder and powder with the same components as the working components according to the mass ratio of 3:2 on the first transition layer, wherein the thickness of the mixed powder is 50 mu m; the second transition layer was sprayed with a mixed powder of NiCrAl composite powder and powder of the same composition as the working composition in a mass ratio of 2:3, and the thickness was 50 μm.
The preparation method of the gradient composite coating refers to the method of example 1.
The measured friction coefficient of the coating is 0.3, the microhardness is 1100HV, the bonding strength of the coating is 40MPa, and the thermal shock frequency of the failure of the coating is 238 times under the conditions of 400 ℃ and water quenching.
Comparative example 1:
a wear-resistant corrosion-resistant high-entropy alloy gradient composite coating of an outer cylinder of a measurement-while-drilling instrument is characterized in that a bonding layer is sprayed on the surface of a substrate firstly and then a working layer is sprayed, wherein the bonding layer is formed by spraying NiCrAl composite powder (10 wt% of Cr, 5 wt% of Al and the balance of Ni) and has the thickness of 50 mu m; the working layer was sprayed with a mixed powder of TiN powder and 10% high entropy alloy powder, with a thickness of 150 μm.
The preparation method of the gradient composite coating refers to the method of example 1.
The measured friction coefficient of the coating is 0.65, the microhardness is 842HV, the bonding strength of the coating is 28MPa, and the times of thermal shock of failure of the coating is 127 times under the conditions of water quenching at 400 ℃.
Comparative example 2:
the wear-resistant corrosion-resistant high-entropy alloy gradient composite coating of the outer cylinder of the measurement-while-drilling instrument is sequentially provided with a bonding layer, a first transition layer, a second transition layer and a working layer from a matrix to the surface, wherein the mass ratio of each component in each layer is as follows: the bonding layer is formed by spraying NiCrAl composite powder (10 wt% of Cr, 5 wt% of Al and the balance of Ni) and has the thickness of 40 mu m; the working layer is sprayed with TiN powder with the thickness of 100 mu m; spraying mixed powder formed by mixing NiCrAl composite powder and TiN powder according to the mass ratio of 6:5 on the first transition layer, wherein the thickness of the mixed powder is 60 mu m; and spraying mixed powder formed by mixing NiCrAl composite powder and TiN powder according to the mass ratio of 5:6 on the second transition layer, wherein the thickness of the mixed powder is 60 mu m.
The preparation method of the gradient composite coating refers to the method of example 1.
The measured friction coefficient of the coating is 0.51, the microhardness is 825HV, the bonding strength of the coating is 32MPa, and the thermal shock frequency of the coating failure is 162 times under the conditions of 400 ℃ and water quenching.
Comparative example 3:
the wear-resistant corrosion-resistant high-entropy alloy gradient composite coating of the outer cylinder of the measurement-while-drilling instrument is sequentially provided with a bonding layer, a transition layer and a working layer from a matrix to the surface, wherein the mass ratio of each component in each layer is as follows: the bonding layer is formed by spraying NiCrAl composite powder (10 wt% of Cr, 5 wt% of Al and the balance of Ni) and has the thickness of 30 mu m; spraying mixed powder consisting of TiN powder and 30% of high-entropy alloy powder on the working layer, wherein the thickness of the mixed powder is 120 mu m; the transition layer is sprayed with mixed powder formed by mixing NiCrAl composite powder and powder with the same components as the working composition according to the mass ratio of 3:2, and the thickness of the mixed powder is 50 mu m.
The preparation method of the gradient composite coating refers to the method of example 1.
The measured friction coefficient of the coating is 0.38, the microhardness is 962HV, the bonding strength of the coating is 35MPa, and the times of thermal shock of failure of the coating are 185 times under the conditions of water quenching at 400 ℃.
Comparative example 4:
the wear-resistant corrosion-resistant high-entropy alloy gradient composite coating of the outer cylinder of the measurement-while-drilling instrument is sequentially provided with a bonding layer, a transition layer and a working layer from a matrix to the surface, wherein the mass ratio of each component in each layer is as follows: the bonding layer is formed by spraying NiCrAl composite powder (10 wt% of Cr, 5 wt% of Al and the balance of Ni) and has the thickness of 40 mu m; spraying mixed powder consisting of TiN powder and 20% of high-entropy alloy powder on the working layer, wherein the thickness of the mixed powder is 100 mu m; and spraying mixed powder formed by mixing NiCrAl composite powder and powder with the same components as the working composition according to the mass ratio of 6:5 on the transition layer, wherein the thickness of the mixed powder is 120 mu m.
The preparation method of the gradient composite coating refers to the method of example 1.
The measured friction coefficient of the coating is 0.45, the microhardness is 862HV, the bonding strength of the coating is 34MPa, and the times of thermal shock of failure of the coating are 177 times under the conditions of 400 ℃ and water quenching.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (5)
1. The wear-resistant corrosion-resistant high-entropy alloy gradient composite coating for the outer cylinder of a Measurement While Drilling (MWD) instrument is characterized in that a bonding layer, a first transition layer, a second transition layer and a working layer are sequentially arranged on the gradient composite coating from a substrate to the surface, wherein the bonding layer is composed of NiCrAl composite powder; the working layer consists of TiN powder and high-entropy alloy powder; the first transition layer is composed of mixed powder consisting of NiCrAl composite powder, TiN powder and high-entropy alloy powder; the second transition layer is composed of mixed powder composed of NiCrAl composite powder, TiN powder and high-entropy alloy powder;
the average particle size of the NiCrAl composite powder is 38-63 mu m, the content of Cr is 6-18 wt%, the content of Al is 5-10 wt%, and the balance is Ni;
the content of the high-entropy alloy powder in the working layer accounts for 10-30 wt% of the total mass of the TiN powder and the high-entropy alloy powder, wherein the high-entropy alloy powder is AlCoCrFeNiTi high-entropy alloy powder;
in the first transition layer, the mass ratio of the NiCrAl composite powder to the mixture of the TiN powder and the high-entropy alloy powder is 3 (1.5-2.5); in the second transition layer, the mass ratio of the NiCrAl composite powder to the mixture of the TiN powder and the high-entropy alloy powder is (1.5-2.5): 3.
2. The wear-resistant corrosion-resistant high-entropy alloy gradient composite coating of claim 1, wherein the TiN powder has an average particle size of 18-43 μm; the average grain diameter of the high-entropy alloy powder is 45-106 mu m.
3. The wear-resistant corrosion-resistant high-entropy alloy gradient composite coating of claim 1, wherein the thicknesses of the bonding layer, the first transition layer, the second transition layer and the working layer are 30-50 μm, 50-80 μm and 100-150 μm, respectively.
4. The wear-resistant corrosion-resistant high-entropy alloy gradient composite coating of claim 1, wherein the friction coefficient of the obtained gradient coating is 0.3-0.5, the microhardness is 870-1100 HV, the bonding strength of the coating is 36-40 MPa, and the thermal shock frequency of failure of the coating is not less than 200 times measured under the conditions of 400 ℃ and water quenching.
5. The preparation method of the wear-resistant corrosion-resistant high-entropy alloy gradient composite coating according to claim 1, characterized by comprising the following steps:
(1) preparing mixed powder of each layer: weighing NiCrAl powder, high-entropy alloy powder and TiN powder according to the mass ratio of the powder in each layer, respectively putting the NiCrAl powder, the high-entropy alloy powder and the TiN powder into a ball milling tank, adding ethanol, ball milling, vacuum drying, grinding and sieving, then adding a polyvinyl alcohol solution, vacuum drying, grinding and sieving, and preparing mixed powder;
(2) treating the surface of a substrate: polishing, cleaning and sandblasting the surface of the base material for coarsening;
(3) preheating a matrix: preheating the substrate treated in the step (2) by using flame of a plasma spray gun;
(4) spraying a gradient coating: spraying a NiCrAl bonding layer, spraying mixed powder of a first transition layer and a second transition layer respectively, and spraying mixed powder of a working layer;
(5) and (3) post-treatment of the coating: and carrying out vacuum heat treatment on the sprayed sample.
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| CN112195463A (en) * | 2020-07-31 | 2021-01-08 | 中北大学 | AlCoCrFeNi/NbC gradient high-entropy alloy coating material prepared by laser cladding and method |
| CN112307621B (en) * | 2020-10-30 | 2022-11-01 | 山东大学 | Tangential functional gradient coating transition region design and performance prediction method based on track width and track spacing constraints |
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| CN114196952A (en) * | 2021-12-07 | 2022-03-18 | 哈尔滨工程大学 | High-entropy alloy bionic gradient structure composite coating with eutectic interface and preparation method thereof |
| CN114318208B (en) * | 2022-01-07 | 2023-12-08 | 中国科学院合肥物质科学研究院 | Composite coating for lead-based reactor pump impeller and preparation method thereof |
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