CN117904625A - Preparation method of WC doped composite high-entropy alloy high-temperature self-lubricating coating - Google Patents
Preparation method of WC doped composite high-entropy alloy high-temperature self-lubricating coating Download PDFInfo
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- 239000011248 coating agent Substances 0.000 title claims abstract description 69
- 238000000576 coating method Methods 0.000 title claims abstract description 69
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 51
- 239000002131 composite material Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 84
- 238000000034 method Methods 0.000 claims abstract description 24
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 238000001856 aerosol method Methods 0.000 claims abstract description 10
- 238000005253 cladding Methods 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 33
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 238000003723 Smelting Methods 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 238000009689 gas atomisation Methods 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 7
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 5
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 3
- 239000003595 mist Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 210000003298 dental enamel Anatomy 0.000 abstract description 11
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- 239000002245 particle Substances 0.000 abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
- 239000012634 fragment Substances 0.000 abstract description 6
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 3
- 150000004706 metal oxides Chemical class 0.000 abstract description 3
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 abstract description 3
- 230000002277 temperature effect Effects 0.000 abstract description 3
- 229910001930 tungsten oxide Inorganic materials 0.000 abstract description 3
- 150000002500 ions Chemical class 0.000 description 8
- 238000005299 abrasion Methods 0.000 description 7
- 238000005461 lubrication Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000000227 grinding Methods 0.000 description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
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- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000012387 aerosolization Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 231100000241 scar Toxicity 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
Abstract
The invention provides a preparation method of a WC doped composite high-entropy alloy high-temperature self-lubricating coating, which comprises the following steps: preparing FeCoCrNiMn high-entropy alloy powder by adopting an aerosol method, and selecting WC powder; heating, drying and cooling the two powders to room temperature, and uniformly mixing the two powders according to a preset proportion to obtain a powder mixture; and cladding the obtained powder mixture on a steel matrix by adopting a plasma surfacing process to obtain the WC doped composite high-entropy alloy high-temperature self-lubricating coating. By adopting the scheme of the invention, cracks can not appear even if the WC ratio in the coating is 80wt%, and the coating has excellent wear resistance at high temperature; in the invention, the self-lubricating enamel layer rich in tungsten oxide and other metal oxides is generated on the surface of the coating, and the enamel layer which is partially peeled off is mixed between friction pairs and is crushed into fragments, so that the fragments play a role of lubricant in the friction process, and a large amount of free carbon under the high temperature effect enters into an FCC matrix to strengthen the FCC phase, so that the hardness of the tissue around WC particles is further improved.
Description
Technical Field
The invention relates to the technical field of preparation of composite high-entropy alloy materials, in particular to a preparation method of a WC doped composite high-temperature self-lubricating coating of a high-entropy alloy.
Background
The descaling roller of the hot rolled plate strip steel production line is in a high-temperature abrasion environment for a long time, and the abrasion forms are mainly inter-metal adhesion abrasion and sliding abrasion. In the long-term use process, the surface of the roller is easy to peel off and rub, and the corresponding surface of the friction pair, namely the surface of the plate blank, can also generate defects of scratch, deformation and the like, thereby directly affecting the quality of a finished product. The descaling roller can be worn for a long time, the roller diameter is reduced to the lower limit size, and the descaling roller can not be used continuously. Because the descaling roller is subjected to severe working conditions such as high-temperature abrasion, strong corrosion and the like, the abrasion problem between friction pairs cannot be effectively solved only by adding a lubricant (such as lubricating oil or grease). Thus, the method is applicable to a variety of applications. It is necessary to develop a completely new coating with high temperature lubrication characteristics for application to the surface of the descaling roller to meet the service life under severe friction conditions.
WC has high microhardness and good wear resistance, but has high brittleness and poor toughness, and is easy to peel off and fall off if being directly used as a cladding layer. Therefore, in practical application, tungsten carbide is often used as a hard phase to be doped in a matrix with good toughness, and at present, a plurality of Ni-based WC is used, but the mass fraction of WC is generally below 45 wt%. The reason is that the brittleness of WC is large, the brittleness phase is increased due to the fact that the WC duty ratio is too high, cracks appear in WC particles, the high-Ni substrate cannot absorb energy generated by the cracks, the cracks are expanded to the substrate and finally spread to the surface of the coating, and under the action of external load, the cracks are mutually overlapped to form small areas, and the small areas are easy to peel off.
In the prior art, a document CN108060322B discloses a preparation method of a hard high-entropy alloy composite material, which comprises the following steps: selecting superhard material powder and alloy element powder as raw materials, wherein the alloy element powder is selected from Fe powder, co powder, cr powder, ni powder, mn powder and alloy powder composed of any three or more elements, and the superhard material powder is selected from one or more of WC alloy powder, BN powder and diamond powder; ball milling is carried out on the selected raw materials to obtain fine-grain powder, discharge plasma sintering is carried out on the fine-grain powder, cooling is carried out along with a furnace, and the sintered body is the hard high-entropy alloy composite material. The hard high-entropy alloy prepared based on the scheme inherits the excellent characteristics of a matrix, and the added super-hard particles obviously improve the hardness of the material, so that the material has better comprehensive performance than die steel, but the content of a hard phase cannot be higher than 70%, and the self-lubricating performance of the hard high-entropy alloy composite material cannot be effectively improved.
Disclosure of Invention
The invention aims to provide a preparation method of a WC doped composite high-temperature self-lubricating coating, at least for solving the technical problems in the background art, especially for effectively preventing cracks from occurring and simultaneously considering the self-lubricating performance of the high-temperature self-lubricating coating of the high-temperature alloy.
The invention adopts the following technical scheme.
A preparation method of a WC doped composite high-entropy alloy high-temperature self-lubricating coating comprises the following steps:
Step 1, preparing FeCoCrNiMn high-entropy alloy powder with an average diameter of 45-105 mu m by adopting an aerosol method; spherical WC powder with the diameter of about 53-150um is selected;
as a preferable scheme, the aerosol method in step 1 comprises the following steps:
Weighing all simple substance metal raw materials according to the equimolar ratio of Fe to Co to Cr to Ni to Mn of 1:1:1:1, wherein the purity of each simple substance metal raw material is more than or equal to 99.99%, and putting the simple substance metal raw materials into a crucible of a smelting furnace for smelting; the vacuum degree of the smelting furnace is 5 multiplied by 10 -3 Mpa, and the smelting time is 2-3 hours; the inert gas in the gas atomization method is 99.999 percent ultra-pure argon, the gas mist pressure is 4 MPa-6 MPa, and the gas atomization time is 10 min-15 min; coCrFeMnNi high-entropy alloy powder is selected by a vibrating screen powder machine, wherein the grain diameter of the high-entropy alloy powder is 53-105 mu m;
In the invention, the aerosolization powder preparation technology has the advantages of high production efficiency, low cost, direct preparation of spherical powder and better sphericity, and becomes one of the main methods for efficiently preparing the metal powder, and the powder prepared by the method has the advantages of good sphericity, high purity, low oxygen content and good powder fluidity;
Step 2, heating and drying the two powders at 80 ℃ for 2 hours, cooling to room temperature, and uniformly mixing according to a preset proportion to obtain a powder mixture; wherein the WC accounts for 80 wt percent, and the FeCoCrNiMn high-entropy alloy powder accounts for 20 wt percent;
and step 3, cladding the obtained powder mixture on a steel substrate by adopting a plasma surfacing process to obtain the WC doped composite high-entropy alloy high-temperature self-lubricating coating.
Further, the plasma surfacing process parameters in the step 3 are as follows:
Welding current is 140-160A, powder feeding capacity is 40rad/min, and welding speed is 170mm/min; argon is used as shielding gas, ion gas and powder supply gas, the shielding gas flow is 1L/min, the ion gas flow is 2L/min, and the powder supply gas flow is 4L/min.
Further, the obtained WC doped composite high-temperature self-lubricating coating is placed in a high-temperature environment at 600 ℃ for friction and wear treatment, the friction and wear treatment time is 1800s, the applied load is 10N, the rotating speed is 300r/min, and the diameter of the silicon nitride friction ball is 9.525mm.
The beneficial effects are that: by adopting the scheme of the invention, cracks can not appear even if the WC ratio in the coating is 80wt%, the coating has excellent wear resistance at high temperature, and the WC hard particles greatly strengthen the matrix and effectively resist frictional wear; in the invention, the self-lubricating enamel layer rich in tungsten oxide and other metal oxides is generated on the surface of the coating, and the enamel layer which is partially peeled off is mixed between friction pairs and is crushed into fragments, so that the fragments play a role of a lubricant in the friction process, and a large amount of free carbon under the high temperature effect enters an FCC matrix to strengthen the FCC phase, so that the hardness of the tissues around WC particles is further improved; particularly, a relatively smooth enamel layer is generated on the surface of the coating after the coating is acted at 600 ℃, so that the peeling of the surface of the coating is effectively inhibited; in the invention, the high-temperature self-lubrication of the coating is realized by the synergistic effect of the high hardness of the surface of the coating and the lubricant, and the more obvious the high-temperature self-lubrication of the coating after the action at 600 ℃. More importantly, by adopting the scheme of the invention, the pore structure in the coating can be effectively changed, so that a plurality of mutually independent stable micropore structures are formed in the coating, and the self-lubricating performance of the high-temperature self-lubricating coating of the high-entropy alloy is considered.
Drawings
Powder microtopography in fig. 1: (a) Part FeCoCrNiMn is the high-entropy alloy powder in the examples, (b) part is the WC powder in the examples;
FIG. 2 is a graph showing XRD results for the high-temperature self-lubricating coating of the high-entropy alloy of example 1 at room temperature;
FIG. 3 is a SEM result graph of the high temperature self-lubricating coating of the high entropy alloy of example 1 at room temperature;
FIG. 4 shows the wear scar morphology of the high-temperature self-lubricating coating of the high-entropy alloy at different temperatures in the examples: (a1) Part (a 2) corresponds to the grinding mark morphology of the coating after being treated at normal temperature, part (b 1) and part (b 2) corresponds to the grinding mark morphology of the coating after being treated at 400 ℃, and part (c 1) and part (c 2) corresponds to the grinding mark morphology of the coating after being treated at 600 ℃;
FIG. 5 is a graph showing the friction coefficients of the high-temperature self-lubricating coating of the high-entropy alloy at different temperatures in the examples.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
A preparation method of a WC doped composite high-entropy alloy high-temperature self-lubricating coating comprises the following steps:
Step 1, preparing FeCoCrNiMn high-entropy alloy powder with an average diameter of 45-105 mu m by adopting an aerosol method, wherein the microscopic morphologies of the two powders are shown in figure 1; spherical WC powder with the diameter of about 53-150um is selected; in this embodiment, the process of the gas atomization method is as follows: weighing all simple substance metal raw materials according to the equimolar ratio of Fe to Co to Cr to Ni to Mn of 1:1:1:1, wherein the purity of each simple substance metal raw material is more than or equal to 99.99%, and putting the simple substance metal raw materials into a crucible of a smelting furnace for smelting; the vacuum degree of the smelting furnace is 5 multiplied by 10 -3 Mpa, and the smelting time is 2-3 hours; the inert gas in the gas atomization method is 99.999 percent ultra-pure argon, the gas mist pressure is 4 MPa-6 MPa, and the gas atomization time is 10 min-15 min; coCrFeMnNi high-entropy alloy powder is selected by a vibrating screen powder machine, wherein the grain diameter of the high-entropy alloy powder is 53-105 mu m;
Step 2, heating and drying the two powders at 80 ℃ for 2 hours, cooling to room temperature, and uniformly mixing according to a preset proportion to obtain a powder mixture; wherein the WC accounts for 80 wt percent, and the FeCoCrNiMn high-entropy alloy powder accounts for 20 wt percent;
And 3, cladding the obtained powder mixture on a steel (45 # substrate) by adopting a plasma surfacing process to obtain the WC doped composite high-entropy alloy high-temperature self-lubricating coating, wherein the SEM result of the coating is shown in figure 3, and the WC hard phase is embedded in the FCC phase with better ductility and is mutually wetted with the FCC phase, so that the bonding strength is good. Wherein, a DML-VO3AD type plasma cladding platform produced by Shenyang multi-wood company is adopted, and the technological parameters of the plasma surfacing are as follows: welding current is 140-160A, powder feeding capacity is 40rad/min, and welding speed is 170mm/min; argon is adopted as shielding gas, ion gas and powder supply gas, the shielding gas flow is 1L/min, the ion gas flow is 2L/min, and the powder supply gas flow is 4L/min;
and 4, placing the obtained WC doped composite high-temperature self-lubricating coating in a high-temperature environment of 600 ℃ for friction and wear treatment (using an MFT-5000 of a Rtec multifunctional friction and wear testing machine), wherein the friction and wear treatment time is 1800s, the applied load is 10N, the rotating speed is 300r/min, and the diameter of the silicon nitride friction ball is 9.525mm.
Examples
A preparation method of a WC doped composite high-entropy alloy high-temperature self-lubricating coating comprises the following steps:
Step 1, preparing FeCoCrNiMn high-entropy alloy powder with an average diameter of 45-105 mu m by adopting an aerosol method; spherical WC powder with the diameter of about 53-150um is selected; wherein, the technological parameters of the aerosol method are the same as those of the embodiment 1;
Step 2, heating and drying the two powders at 80 ℃ for 2 hours, cooling to room temperature, and uniformly mixing according to a preset proportion to obtain a powder mixture; wherein the WC accounts for 80 wt percent, and the FeCoCrNiMn high-entropy alloy powder accounts for 20 wt percent;
And 3, cladding the obtained powder mixture on a steel (45 # substrate) by adopting a plasma surfacing process to obtain the WC doped composite high-entropy alloy high-temperature self-lubricating coating. Wherein, a DML-VO3AD type plasma cladding platform produced by Shenyang multi-wood company is adopted, and the technological parameters of the plasma surfacing are as follows: welding current is 140-160A, powder feeding capacity is 40rad/min, and welding speed is 170mm/min; argon is adopted as shielding gas, ion gas and powder supply gas, the shielding gas flow is 1L/min, the ion gas flow is 2L/min, and the powder supply gas flow is 4L/min;
And 4, placing the obtained WC doped composite high-temperature self-lubricating coating in a high-temperature environment of 400 ℃ for friction and wear treatment (using an MFT-5000 of a Rtec multifunctional friction and wear testing machine), wherein the friction and wear treatment time is 1800s, the applied load is 10N, the rotating speed is 300r/min, and the diameter of the silicon nitride friction ball is 9.525mm.
Examples
A preparation method of a WC doped composite high-entropy alloy high-temperature self-lubricating coating comprises the following steps:
Step 1, preparing FeCoCrNiMn high-entropy alloy powder with an average diameter of 45-105 mu m by adopting an aerosol method; spherical WC powder with the diameter of about 53-150um is selected; wherein, the technological parameters of the aerosol method are corresponding to those of example 1;
Step 2, heating and drying the two powders at 80 ℃ for 2 hours, cooling to room temperature, and uniformly mixing according to a preset proportion to obtain a powder mixture; wherein the WC accounts for 80 wt percent, and the FeCoCrNiMn high-entropy alloy powder accounts for 20 wt percent;
And 3, cladding the obtained powder mixture on a steel (45 # substrate) by adopting a plasma surfacing process to obtain the WC doped composite high-entropy alloy high-temperature self-lubricating coating. Wherein, a DML-VO3AD type plasma cladding platform produced by Shenyang multi-wood company is adopted, and the technological parameters of the plasma surfacing are as follows: welding current is 140-160A, powder feeding capacity is 40rad/min, and welding speed is 170mm/min; argon is adopted as shielding gas, ion gas and powder supply gas, the shielding gas flow is 1L/min, the ion gas flow is 2L/min, and the powder supply gas flow is 4L/min;
And 4, placing the obtained WC doped composite high-temperature self-lubricating coating in a room temperature environment for friction and wear treatment (using an MFT-5000 of a Rtec multifunctional friction and wear testing machine), wherein the friction and wear treatment time is 1800s, the applied load is 10N, the rotating speed is 300r/min, and the diameter of the silicon nitride friction ball is 9.525mm.
The XRD results of the WC-doped composite high-entropy alloy high-temperature self-lubricating coating samples prepared in the test examples at room temperature are shown in fig. 2.
The abrasion mark morphology results of the WC doped composite high-entropy alloy high-temperature self-lubricating coating sample prepared in the detection example are shown in fig. 4: the WC-doped composite high-temperature self-lubricating coating of example 1 has a relatively smooth and fine enamel layer (gray-white plaque in fig. 4), a large amount of carbon in a free state (indicated by dotted arrows) enters the FCC matrix, and the enamel layer which is partly exfoliated is sandwiched between friction pairs, is crushed into chips, plays a role of lubricant in the friction process, and forms a plurality of mutually independent stable microporous structures (indicated by solid arrows of parts b2 and c2 in fig. 4) inside the coating; the WC-doped composite high-temperature self-lubricating coating of example 2 also has some enamel layer, but has a larger pore structure than that of example 1, and less carbon in free form than that of example 1; the WC-doped composite high-temperature self-lubricating coating of example 3 had cracks (shown by solid arrows in a2 part of fig. 4) instead of individual micropores, almost no carbon in a free state, and there were cases where the coating peeled off.
The friction coefficient of the WC doped composite high-entropy alloy high-temperature self-lubricating coating sample prepared in the example is measured, and the result is shown in fig. 5: the average friction coefficient of the sample in example 1 was 0.156, the average friction coefficient of the sample in example 2 was 0.434, and the average friction coefficient of the sample in example 3 was 0.405. The WC doped composite high-entropy alloy high-temperature self-lubricating coating prepared in the example 1 has quite excellent high-temperature self-lubricating performance.
With the solutions of examples 1 and 2, cracks do not occur even when the WC content in the coating is 80wt%, the coating has excellent wear resistance at high temperature, and the WC hard particles greatly strengthen the matrix and effectively resist frictional wear; in the scheme, a self-lubricating enamel layer rich in tungsten oxide and other metal oxides is generated on the surface of the coating, and the enamel layer which is partially peeled off is mixed between friction pairs and is crushed into fragments, so that the fragments play a role of a lubricant in the friction process, and a large amount of free carbon under the high temperature effect enters an FCC matrix to strengthen an FCC phase, so that the hardness of tissues around WC particles is further improved; particularly, a relatively smooth enamel layer is generated on the surface of the coating after the coating is acted at 600 ℃, so that the peeling of the surface of the coating is effectively inhibited; according to the invention, the synergistic effect of the high hardness of the surface of the coating and the lubricant realizes the high-temperature self-lubrication of the coating, and the more obvious the high-temperature self-lubrication of the coating after the coating is acted at 600 ℃. More importantly, by adopting the scheme of the embodiment 1, the pore structure in the coating can be effectively changed, so that a plurality of mutually independent stable micropore structures are formed in the coating, and the self-lubricating performance of the high-temperature self-lubricating coating of the high-entropy alloy is considered.
Claims (4)
1. The preparation method of the WC doped composite high-temperature self-lubricating coating is characterized by comprising the following steps of:
Step 1, preparing FeCoCrNiMn high-entropy alloy powder with an average diameter of 45-105 mu m by adopting an aerosol method; spherical WC powder with the diameter of about 53-150um is selected;
Step 2, heating and drying the two powders at 80 ℃ for 2 hours, cooling to room temperature, and uniformly mixing according to a preset proportion to obtain a powder mixture; wherein the WC accounts for 80 wt percent, and the FeCoCrNiMn high-entropy alloy powder accounts for 20 wt percent;
and step 3, cladding the obtained powder mixture on a steel substrate by adopting a plasma surfacing process to obtain the WC doped composite high-entropy alloy high-temperature self-lubricating coating.
2. The method according to claim 1, wherein the plasma surfacing process parameters in step3 are:
Welding current is 140-160A, powder feeding capacity is 40rad/min, and welding speed is 170mm/min; argon is used as shielding gas, ion gas and powder supply gas, the shielding gas flow is 1L/min, the ion gas flow is 2L/min, and the powder supply gas flow is 4L/min.
3. The method according to claim 2, wherein the aerosol method in step 1 comprises the steps of:
Weighing all simple substance metal raw materials according to the equimolar ratio of Fe to Co to Cr to Ni to Mn of 1:1:1:1, wherein the purity of each simple substance metal raw material is more than or equal to 99.99%, and putting the simple substance metal raw materials into a crucible of a smelting furnace for smelting; the vacuum degree of the smelting furnace is 5 multiplied by 10 -3 Mpa, and the smelting time is 2-3 hours; the inert gas in the gas atomization method is 99.999 percent ultra-pure argon, the gas mist pressure is 4 MPa-6 MPa, and the gas atomization time is 10 min-15 min; coCrFeMnNi high-entropy alloy powder is selected by a vibrating screen powder machine, and the grain size of the high-entropy alloy powder is 53-105 mu m.
4. A process according to any one of claims 1 to 3, characterized in that: the WC doped composite high-temperature self-lubricating coating is placed in a high-temperature environment at 600 ℃ for friction and wear treatment, the friction and wear treatment time is 1800s, the applied load is 10N, the rotating speed is 300r/min, and the diameter of the silicon nitride friction ball is 9.525mm.
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