CN114058894B - Medium-entropy alloy self-lubricating composite material and preparation method thereof - Google Patents
Medium-entropy alloy self-lubricating composite material and preparation method thereof Download PDFInfo
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- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0068—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only nitrides
Abstract
The invention provides a medium-entropy alloy self-lubricating composite material and a preparation method thereof, belonging to the technical field of lubricating materials. The invention adopts micron-sized hexagonal boron nitride, has good dispersibility, and uses a chemical synthesis method to coat nano silver on the surface of the hexagonal boron nitride, so that the nano silver is dispersed along with the dispersion of the boron nitride, and simultaneously, due to the coating of Ag, the phenomenon of uneven distribution of the hexagonal boron nitride in the material mixing process is improved, and the associativity of the hexagonal boron nitride and a medium-entropy alloy matrix is increased. The hexagonal boron nitride has lower friction coefficient from room temperature to 900 ℃, and the soft metal silver has good lubricating property from room temperature to 500 ℃. In addition, the obtained medium-entropy alloy self-lubricating composite material has good lubricating property in a wide temperature range (room temperature to 600 ℃).
Description
Technical Field
The invention relates to the technical field of lubricating materials, in particular to a medium-entropy alloy self-lubricating composite material and a preparation method thereof.
Background
The high-entropy alloy is difficult to industrially produce due to high cost and unstable performance, the performance of the medium-entropy alloy is not reduced due to the reduction of the number of main elements, and the medium-entropy alloy is between the traditional low-entropy alloy and the high-entropy alloy, has excellent performance and is easier to industrially apply. At present, the preparation of the mesopic self-lubricating composite material of the mesopic alloy is only reported.
The soft metallic silver can obtain a lower friction coefficient due to its low shear strength, but is easily oxidized, and the inorganic non-metallic phase hexagonal boron nitride has lubricity and is resistant to high temperatures. In the current research of the high-entropy alloy self-lubricating composite material, most of solid lubricants are directly mixed in a mechanical mixing mode and are sintered and molded, but the bonding performance of hexagonal boron nitride and a metal matrix is poor, and microcracks and other defects are easily formed in the molding process. Meanwhile, in the process of mechanical mixing, nano silver is easy to agglomerate, so that the performance uniformity of the composite material is poor.
Disclosure of Invention
The invention aims to provide a medium-entropy alloy self-lubricating composite material and a preparation method thereof, which overcome the problems of poor bonding property of hexagonal boron nitride and an alloy matrix and easy agglomeration of nano silver, and the obtained medium-entropy alloy self-lubricating composite material has a low friction coefficient and good wear resistance.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of a medium-entropy alloy self-lubricating composite material, which comprises the following steps:
mixing hexagonal boron nitride, dopamine and water, and carrying out polymerization coating to obtain polydopamine-coated hexagonal boron nitride; the grain size of the hexagonal boron nitride is micron-sized;
mixing a silver nitrate solution and ammonia water to obtain a silver ammonia solution;
mixing the silver ammonia solution, polyvinylpyrrolidone, polydopamine-coated hexagonal boron nitride and glucose aqueous solution, and carrying out reduction reaction to obtain silver-coated hexagonal boron nitride;
and mixing the medium-entropy alloy powder with the silver-coated hexagonal boron nitride, placing the obtained mixture in a mould for hot-pressing sintering, and demoulding to obtain the medium-entropy alloy self-lubricating composite material.
Preferably, the mass ratio of the hexagonal boron nitride to the dopamine is 1: (1-2).
Preferably, the polymerization coating is carried out under the condition that the pH value is 8-10.
Preferably, the concentration of the silver nitrate solution is 15-30 g/L; the mass concentration of the ammonia water is 10-25%.
Preferably, the mass of the silver ammonia solution is calculated by the mass of silver nitrate in a silver nitrate solution, and the mass ratio of the silver nitrate to the polydopamine-coated hexagonal boron nitride is 1: (0.15 to 1); the mass ratio of the silver nitrate to the polyvinylpyrrolidone is 1: (0.2 to 0.4); the mass ratio of the silver nitrate to the glucose in the glucose aqueous solution is 1: (1.8-3).
Preferably, the time of the reduction reaction is 40-80 min.
Preferably, the pressure of the hot-pressing sintering is 20-40 MPa, the temperature is 700-1000 ℃, and the heat preservation and pressure maintaining time is 10-20 min.
Preferably, the medium entropy alloy powder comprises CrCoNi powder.
Preferably, the mass of the medium-entropy alloy powder is 85-95% of the total mass of the medium-entropy alloy powder and the silver-coated hexagonal boron nitride.
The invention provides a medium-entropy alloy self-lubricating composite material prepared by the preparation method in the scheme, which comprises a medium-entropy alloy matrix and silver-coated hexagonal boron nitride dispersed in the medium-entropy alloy matrix, wherein the silver-coated hexagonal boron nitride comprises silver nanoparticles and hexagonal boron nitride, and the silver nanoparticles and the hexagonal boron nitride are connected through polydopamine.
The invention provides a preparation method of a medium-entropy alloy self-lubricating composite material, which comprises the following steps: mixing hexagonal boron nitride, dopamine and water, and carrying out polymerization coating to obtain polydopamine-coated hexagonal boron nitride; the grain size of the hexagonal boron nitride is micron-sized; mixing a silver nitrate solution and ammonia water to obtain a silver ammonia solution; mixing the silver ammonia solution, polyvinylpyrrolidone, polydopamine-coated hexagonal boron nitride and glucose aqueous solution, and carrying out reduction reaction to obtain silver-coated hexagonal boron nitride; and mixing the medium-entropy alloy powder with the silver-coated hexagonal boron nitride, placing the obtained mixture in a mould for hot-pressing sintering, and demoulding to obtain the medium-entropy alloy self-lubricating composite material.
The invention adopts micron-sized hexagonal boron nitride, has good dispersibility, and uses a chemical synthesis method to coat nano silver on the surface of the hexagonal boron nitride, so that the nano silver is dispersed along with the dispersion of the boron nitride, and simultaneously, due to the coating of Ag, the phenomenon of uneven distribution of the hexagonal boron nitride in the material mixing process is improved, and the associativity of the hexagonal boron nitride and a medium-entropy alloy matrix is increased. The hexagonal boron nitride has lower friction coefficient from room temperature to 900 ℃, and the soft metal silver has good lubricating property from room temperature to 500 ℃. In addition, the obtained medium-entropy alloy self-lubricating composite material has good lubricating property in a wide temperature range (room temperature to 600 ℃).
Drawings
FIG. 1 is an SEM image and elemental distribution plot of silver-coated hexagonal boron nitride of example 1;
FIG. 2 is an SEM image and an EDS energy spectrum of the medium-entropy alloy self-lubricating composite material prepared in example 2;
fig. 3 is an SEM image of the medium entropy alloy self-lubricating composite materials prepared in example 1 and comparative example 1.
Detailed Description
The invention provides a preparation method of a medium-entropy alloy self-lubricating composite material, which comprises the following steps:
mixing hexagonal boron nitride, dopamine and water, and carrying out polymerization coating to obtain polydopamine-coated hexagonal boron nitride; the grain size of the hexagonal boron nitride is micron-sized;
mixing a silver nitrate solution and ammonia water to obtain a silver ammonia solution;
mixing the silver ammonia solution, polyvinylpyrrolidone, polydopamine-coated hexagonal boron nitride and glucose aqueous solution, and carrying out reduction reaction to obtain silver-coated hexagonal boron nitride;
and mixing the medium-entropy alloy powder with the silver-coated hexagonal boron nitride, placing the obtained mixture in a die for hot-pressing sintering, and demolding to obtain the medium-entropy alloy self-lubricating composite material.
In the present invention, the starting materials used are all commercially available products well known in the art, unless otherwise specified.
Mixing hexagonal boron nitride, dopamine and water, and carrying out polymerization coating to obtain polydopamine-coated hexagonal boron nitride; the particle size of the hexagonal boron nitride is micron-sized.
In the invention, the particle size of the hexagonal boron nitride is micron-sized, which means that the particle size is 1-100 μm, preferably 1-50 μm, and more preferably 1-10 μm. In the present invention, the water is preferably ultrapure water.
In the present invention, the mass ratio of the hexagonal boron nitride to the dopamine is preferably 1: (1-2), more preferably 1: 1. In the present invention, the mass ratio of the hexagonal boron nitride to the water is preferably 1: (200-400), more preferably 1: 250. in the present invention, the mixing of hexagonal boron nitride, dopamine and water is preferably: adding hexagonal boron nitride into water, performing ultrasonic dispersion for 10-20 min, then adding dopamine, and adding a buffer solution to adjust the pH value to 8-10. The invention has no special requirements on the buffer solution, and can adjust the pH value of the solution to 8-10. The method adjusts the pH value of the solution to 8-10, and is favorable for forming a polydopamine layer. In the present invention, the temperature of the polymeric coating is preferably room temperature; the polymerization coating time is preferably 12 to 18 hours, more preferably 13 to 17 hours, and further preferably 14 to 16 hours. In the present invention, the polymerization coating is preferably carried out under stirring conditions, and the stirring rate is not particularly limited in the present invention, and a stirring rate well known in the art may be used. In the polymerization coating process, dopamine forms a polydopamine layer to coat the surface of the hexagonal boron nitride. After the polymerization coating is completed, the obtained product system is preferably subjected to suction filtration and washing, and then the obtained solid product is dried to obtain the polydopamine-coated hexagonal boron nitride. In the invention, the drying temperature is preferably 80-100 ℃.
The silver nitrate solution and ammonia water are mixed to obtain the silver ammonia solution. In the present invention, the silver nitrate solution is preferably obtained by dissolving silver nitrate in deionized water. In the invention, the concentration of the silver nitrate solution is preferably 15-30 g/L. In the present invention, the mass concentration of the ammonia water is preferably 10 to 25%.
In the present invention, the mixing of the silver nitrate solution and the ammonia water is preferably: ammonia was added to the silver nitrate solution with stirring. In the invention, the volume ratio of the silver nitrate solution to the ammonia water is determined according to experimental phenomena, the solution gradually turns turbid from clarification in the process of adding the ammonia water into the silver nitrate solution, and the ammonia water is stopped being added until the solution is clarified.
After the silver-ammonia solution is obtained, the silver-ammonia solution, polyvinylpyrrolidone, polydopamine-coated hexagonal boron nitride and glucose aqueous solution are mixed for reduction reaction, and the silver-coated hexagonal boron nitride is obtained. In the present invention, the mass of the silver ammonia solution is calculated by the mass of silver nitrate in a silver nitrate solution, and the mass ratio of the silver nitrate to the polydopamine-coated hexagonal boron nitride is preferably 1: (0.15 to 1); the mass ratio of the silver nitrate to the polyvinylpyrrolidone is preferably 1: (0.2 to 0.4); the mass ratio of the silver nitrate to the glucose in the glucose aqueous solution is preferably 1: (1.8-3), more preferably 1: (2.0-2.8). In the invention, the concentration of the glucose solution is preferably 20-60 g/L, and more preferably 30-50 g/L.
In the present invention, mixing the silver ammonia solution, polyvinylpyrrolidone, polydopamine-coated hexagonal boron nitride, and aqueous glucose solution preferably includes: and adding polyvinylpyrrolidone into the silver ammonia solution, stirring for 10-30 min, then adding polydopamine-coated hexagonal boron nitride, performing ultrasonic dispersion for 10-30 min, and finally adding a glucose aqueous solution.
In the present invention, the reduction reaction is preferably carried out under stirring at room temperature. The present invention does not require any particular speed of agitation, and can employ agitation speeds well known in the art. In the invention, the time of the reduction reaction is preferably 40-80 min, and more preferably 50-70 min. In the invention, the polyvinylpyrrolidone has multiple functions and can be used as a reducing agent, a dispersing agent, a protective agent and a surfactant at the same time. After the reduction reaction is completed, the system after the reaction is preferably filtered, washed and dried to obtain the silver-coated hexagonal boron nitride.
After the silver-coated hexagonal boron nitride is obtained, the medium-entropy alloy powder and the silver-coated hexagonal boron nitride are mixed, the obtained mixture is placed in a die for hot-pressing sintering, and the medium-entropy alloy self-lubricating composite material is obtained after the die is removed.
In the invention, the particle size of the medium entropy alloy powder is preferably 10-50 μm, more preferably 15-45 μm, and even more preferably 20-40 μm. In the present invention, the medium entropy alloy powder preferably includes CrCoNi powder. In the invention, the mass of the medium-entropy alloy powder is preferably 85-95% of the total mass of the medium-entropy alloy powder and the silver-coated hexagonal boron nitride.
In the present invention, the mixing is preferably ball milling mixing. The invention has no special requirements on the ball milling mixing conditions, and can be obtained by uniformly mixing the medium-entropy alloy powder and the silver-coated hexagonal boron nitride. In the present invention, the mold is preferably a graphite mold. In the invention, the pressure of the hot-pressing sintering is preferably 20-40 MPa, and more preferably 25-35 MPa; the temperature is preferably 700-1000 ℃, and more preferably 800-900 ℃; the heat preservation and pressure maintaining time is preferably 10-20 min, and more preferably 12-18 min. The invention preferably increases the temperature from room temperature to the temperature of the hot-pressing sintering. The present invention has no special requirement on the temperature rising rate, and the temperature rising rate known in the field can be adopted. And after hot-pressing sintering, freely cooling to room temperature, and demolding to obtain the medium-entropy alloy self-lubricating composite material.
The invention provides a medium-entropy alloy self-lubricating composite material prepared by the preparation method in the scheme, which comprises a medium-entropy alloy matrix and silver-coated hexagonal boron nitride dispersed in the medium-entropy alloy matrix, wherein the silver-coated hexagonal boron nitride comprises silver nanoparticles and hexagonal boron nitride, and the silver nanoparticles and the hexagonal boron nitride are connected through polydopamine.
The hexagonal boron nitride has lower friction coefficient from room temperature to 900 ℃, and the soft metal silver has good lubricating property from room temperature to 500 ℃. In addition, the obtained medium-entropy alloy self-lubricating composite material has good lubricating property in a wide temperature range (room temperature to 600 ℃).
The invention provides a medium entropy alloy self-lubricating composite material and a preparation method thereof, which are described in detail below with reference to examples, but the invention is not to be construed as limiting the scope of the invention.
Example 1
Adding 1g of hexagonal boron nitride in parts by mass into 250mL of ultrapure water, performing ultrasonic dispersion for 20min, adding 1g of dopamine, adding a buffer solution to adjust the pH value to 8, stirring at room temperature for 14 hours, performing suction filtration, washing, and drying in an oven at 80 ℃ to obtain polydopamine-coated hexagonal boron nitride.
Adding 5g of silver nitrate into 250mL of deionized water, stirring for 10min, adding 25mL of ammonia water (mass fraction is 20%) until the solution turns turbid from clear to clear, adding 1g of polyvinylpyrrolidone, stirring for 30min, adding 5g of polydopamine-coated hexagonal boron nitride in parts by mass, ultrasonically dispersing for 30min, adding 300mL of glucose aqueous solution (concentration is 40g/L), stirring for 60min at room temperature, performing suction filtration, washing, and drying in an oven at 100 ℃ to obtain silver-coated hexagonal boron nitride.
Uniformly mixing 40g of CrCoNi medium-entropy alloy powder and 4g of silver-coated hexagonal boron nitride in a ball mill, pouring out the mixed material, putting the mixed material into a graphite die, gradually heating the mixed material from room temperature to 900 ℃ under the pressure of 30MPa, carrying out die pressing for 10min, cooling the mixed material to room temperature, and demoulding to obtain the medium-entropy alloy self-lubricating composite material.
SEM observation and EDS scanning were performed on the silver-coated hexagonal boron nitride in example 1, and the results are shown in fig. 1. In FIG. 1, (a) is an SEM image of silver-coated hexagonal boron nitride, (B) is a partially enlarged SEM image, (c) is a distribution diagram of B, and (d) is a distribution diagram of Ag. As can be seen from fig. 1, silver was successfully coated on the surface of boron nitride.
Example 2
Adding 2g of hexagonal boron nitride in parts by mass into 300mL of ultrapure water, performing ultrasonic dispersion for 20min, adding 2g of dopamine, adding a buffer solution to adjust the pH value to 8, stirring at room temperature for 12 hours, performing suction filtration, washing, and drying in an oven at 80 ℃ to obtain polydopamine-coated hexagonal boron nitride.
Adding 7g of silver nitrate into 250mL of deionized water, stirring for 20min, adding 30mL of ammonia water (mass fraction is 25%) until the solution turns turbid from clear to clear, adding 2g of polyvinylpyrrolidone, stirring for 30min, adding 7g of dopamine-coated hexagonal boron nitride in parts by mass, ultrasonically dispersing for 30min, adding 400mL of glucose aqueous solution (concentration is 45g/L), stirring for 70min at room temperature, performing suction filtration, washing, and drying in an oven at 80 ℃ to obtain silver-coated hexagonal boron nitride.
Uniformly mixing 60g of CrCoNi medium-entropy alloy powder and 6g of silver-coated hexagonal boron nitride in a ball mill, pouring out the mixed material, putting the mixed material into a graphite die, gradually heating the mixed material from room temperature to 950 ℃ under the pressure of 40MPa, carrying out die pressing for 10min, cooling the mixed material to room temperature, and demoulding to obtain the medium-entropy alloy self-lubricating composite material. The scanning results of the morphology and element distribution points of the medium-entropy alloy self-lubricating composite material are shown in fig. 2, wherein in fig. 2, (a) is an SEM picture, (b) is an EDS picture of Spot 1, and (c) is an EDS picture of Spot 2. As can be seen from fig. 2, Ag was successfully coated on the hexagonal boron nitride by dopamine coating and silver mirror reaction, and the silver-coated hexagonal boron nitride was well bonded to the CoCrNi matrix.
Example 3
Adding 1.5g of hexagonal boron nitride in parts by mass into 300mL of ultrapure water, performing ultrasonic dispersion for 20min, adding 2g of dopamine, adding a buffer solution to adjust the pH value to 8, stirring at room temperature for 16 hours, performing suction filtration, washing, and drying in an oven at 80 ℃ to obtain polydopamine-coated hexagonal boron nitride.
Adding 8g of silver nitrate into 300mL of deionized water, stirring for 15min, adding 35mL of ammonia water (mass fraction is 20%) until the solution turns turbid from clear to clear, adding 3g of polyvinylpyrrolidone, stirring for 30min, adding 1.5g of polydopamine-coated hexagonal boron nitride in parts by mass, ultrasonically dispersing for 30min, adding 300mL of glucose aqueous solution (concentration is 50g/L), stirring for 50min at room temperature, performing suction filtration, washing, and drying in an oven at 100 ℃ to obtain silver-coated hexagonal boron nitride.
Uniformly mixing 35g of CrCoNi medium-entropy alloy powder and 5g of silver-coated hexagonal boron nitride in a ball mill, pouring out the mixed material, putting the mixed material into a graphite die, gradually heating the mixed material from room temperature to 950 ℃ under the pressure of 30MPa, carrying out die pressing for 10min, cooling the mixed material to room temperature, and demoulding to obtain the medium-entropy alloy self-lubricating composite material.
Comparative example 1
2g of hexagonal boron nitride and 40g of medium entropy alloy powder are mixed uniformly in a ball mill. Pouring out the mixed materials, putting the materials into a graphite mold, gradually heating the materials from room temperature to 950 ℃ under the pressure of 40MPa, molding for 10min, cooling to room temperature, and demolding to obtain the medium-entropy alloy self-lubricating composite material.
Scanning electron microscope observation is carried out on the medium-entropy alloy self-lubricating composite materials prepared in the example 1 and the comparative example 1, and the result is shown in figure 3. In fig. 3, (a) corresponds to comparative example 1, and (b) corresponds to example 1, and it can be seen from fig. 3 that the bonding property of the medium entropy alloy matrix and the inorganic non-metallic phase hexagonal boron nitride is improved after the hexagonal boron nitride is subjected to the Ag coating treatment.
And (3) performance testing:
the intermediate entropy alloy self-lubricating composite materials of each example and comparative example were polished step by step using 80-, 120-, 240-, 400-, 800-, 1000-and 2000-mesh silicon carbide sandpaper, and friction and wear tests were performed at room temperature, 300 ℃ and 600 ℃, respectively. The test conditions were: the friction load was 10N, the motor frequency was 6.43Hz, the couple was silicon nitride spheres with a diameter of 6mm, and the test time was 30 min. The test results are shown in tables 1-3.
TABLE 1 Friction coefficient and wear rate of self-lubricating composite at Room temperature
| Example 1 | Example 2 | Example 3 | Comparative example 1 | |
| Coefficient of friction | 0.453 | 0.412 | 0.398 | 0.652 |
| |
5.1 | 5.5 | 5.3 | 22 |
TABLE 2300 deg.C friction coefficient and wear rate of self-lubricating composite material
| Example 1 | Example 2 | Example 3 | Comparative example 1 | |
| Coefficient of friction | 0.365 | 0.368 | 0.354 | 0.559 |
| |
6.6 | 6.9 | 7.2 | 26 |
TABLE 3600 deg.C friction coefficient and wear rate of self-lubricating composite material
| Example 1 | Example 2 | Example 3 | Comparative example 1 | |
| Coefficient of friction | 0.296 | 0.316 | 0.310 | 0.536 |
| |
9.6 | 9.3 | 9.5 | 35 |
As can be seen from tables 1 to 3, when unmodified hexagonal boron nitride is directly compounded with the medium-entropy alloy, the friction coefficient is high, the wear rate is high, and after the treatment of Ag-coated hexagonal boron nitride, sintering is performed under the same condition, so that the pores of the composite material are obviously reduced, which shows that the bonding performance of the hexagonal boron nitride and a matrix is improved. Meanwhile, the composite lubrication effect of Ag and hexagonal boron nitride obviously reduces the friction coefficient of the material, has excellent wear resistance and has good friction performance in a wide temperature range from room temperature to 600 ℃.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A preparation method of a medium entropy alloy self-lubricating composite material is characterized by comprising the following steps:
mixing hexagonal boron nitride, dopamine and water, and carrying out polymerization coating to obtain polydopamine-coated hexagonal boron nitride; the grain size of the hexagonal boron nitride is micron-sized;
mixing a silver nitrate solution and ammonia water to obtain a silver ammonia solution;
mixing the silver ammonia solution, polyvinylpyrrolidone, polydopamine-coated hexagonal boron nitride and glucose aqueous solution, and carrying out reduction reaction to obtain silver-coated hexagonal boron nitride;
mixing the medium-entropy alloy powder with the silver-coated hexagonal boron nitride, placing the obtained mixture in a mould for hot-pressing sintering, and demoulding to obtain the medium-entropy alloy self-lubricating composite material;
the pressure of the hot-pressing sintering is 20-40 MPa, the temperature is 700-1000 ℃, and the heat preservation and pressure maintaining time is 10-20 min; the medium-entropy alloy powder is CrCoNi powder.
2. The preparation method according to claim 1, wherein the mass ratio of the hexagonal boron nitride to the dopamine is 1: (1-2).
3. The method according to claim 1, wherein the polymerization is carried out at a pH of 8 to 10.
4. The preparation method according to claim 1, wherein the concentration of the silver nitrate solution is 15-30 g/L; the mass concentration of the ammonia water is 10-25%.
5. The preparation method according to claim 1, wherein the mass of the silver ammonia solution is calculated by the mass of silver nitrate in a silver nitrate solution, and the mass ratio of the silver nitrate to the polydopamine-coated hexagonal boron nitride is 1: (0.15 to 1); the mass ratio of the silver nitrate to the polyvinylpyrrolidone is 1: (0.2 to 0.4); the mass ratio of the silver nitrate to the glucose in the glucose aqueous solution is 1: (1.8-3).
6. The method according to claim 1, wherein the reduction reaction time is 40 to 80 min.
7. The production method according to claim 1, wherein the mass of the intermediate-entropy alloy powder is 85 to 95% of the total mass of the intermediate-entropy alloy powder and the silver-coated hexagonal boron nitride.
8. The medium-entropy alloy self-lubricating composite material prepared by the preparation method of any one of claims 1 to 7 comprises a medium-entropy alloy matrix and silver-coated hexagonal boron nitride dispersed in the medium-entropy alloy matrix, wherein the silver-coated hexagonal boron nitride comprises silver nanoparticles and hexagonal boron nitride, and the silver nanoparticles and the hexagonal boron nitride are connected through polydopamine.
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