CN112813327A - High-entropy alloy-based composite material for oily environment wear-resistant part and preparation method thereof - Google Patents
High-entropy alloy-based composite material for oily environment wear-resistant part and preparation method thereof Download PDFInfo
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- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
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Abstract
The invention provides a high-entropy alloy-based composite material for an oily environment wear-resistant part and a preparation method thereof, and solves the technical problems that in the prior art, the wettability between a high-entropy ceramic phase and a high-entropy alloy is poor, and the toughness and the strength of the material are limited. The preparation of the composite material comprises the following raw materials in percentage by weight: 70-90% of ceramic hard phase, 10-25% of metal binding phase matrix and 1.5-5% of carbon black, wherein the sum of the weight percentages of the raw materials is 100%; the ceramic hard phase comprises high-entropy carbonitride and oxide; the metal binding phase matrix is a high-entropy alloy. The high-entropy alloy-based composite material for the wear-resistant part in the oily environment has excellent corrosion resistance and lower heat conductivity, and the service life of the workpiece is greatly prolonged; meanwhile, the alloy has higher strength and toughness and good hardness and wear resistance.
Description
Technical Field
The invention relates to a composite material, in particular to a high-entropy alloy-based composite material for an oily environment wear-resistant part and a preparation method thereof.
Background
The oily environment is a common complex working condition in the industry and widely exists in the fields of petroleum drilling, mechanical pump bodies, transmission structures and the like. The specific working condition is complex, and various corrosion functions such as acidic or alkaline chemical corrosion, electrochemical corrosion, stress corrosion and the like and various wear mechanisms such as abrasive wear, erosive wear, cavitation wear, erosive wear and the like exist. It is statistical that the economic losses due to corrosion in the oil industry alone account for 6% of the production value, resulting in a large loss of resources and labor costs. Wear-resistant parts in an oily environment have huge markets, and huge resource waste and low production efficiency are caused in the frequent replacement process. Cemented carbide is a common hard material that has excellent hardness and wear resistance. Cemented carbide wear parts are also widely used in oily corrosive environments. But the wear-resistant material still has certain limitation when being used as a wear-resistant part material in an oily environment. The corrosion resistance of the cobalt-nickel binding phase of the traditional hard alloy and the stability of the carbide hard phase are poor, the density is high, and the carrying process wastes time and labor.
With the development of new materials, a concept of high-entropy alloy, which is different from the traditional alloy material prepared on the basis of a single principal element, is proposed. The corrosion-resistant alloy has excellent corrosion resistance due to the fact that the atomic radius and electronegativity of the constituent elements are similar and the passivation element is contained. The high-entropy ceramic prepared based on the high-entropy alloy concept also has a similar mechanism and has excellent hardness, wear resistance and corrosion resistance. The high-entropy composite metal ceramic material consisting of the high-entropy ceramic hard phase and the high-entropy alloy is a potential oily environment wear-resistant part material. However, in the preparation of the high-entropy composite material, a plurality of scientific problems need to be solved, for example, the wettability between the high-entropy ceramic phase and the high-entropy alloy is poor, so that the toughness and the strength of the material are limited; in addition, the selection and preparation of suitable high-entropy ceramic phase alloy elements are also important.
Disclosure of Invention
The invention aims to provide a high-entropy alloy-based composite material for an oily environment wear-resistant part and a preparation method thereof, and aims to solve the technical problems that in the prior art, the wettability between a high-entropy ceramic phase and a high-entropy alloy is poor, and the toughness and the strength of the material are limited. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a high-entropy alloy-based composite material for wear-resistant parts in oily environments, which is prepared from the following raw materials in percentage by weight: 70-90% of ceramic hard phase, 10-25% of metal binding phase matrix and 1.5-5% of carbon black, wherein the sum of the weight percentages of the raw materials is 100%.
The ceramic hard phase comprises high-entropy carbonitride and oxide;
the metal binding phase matrix is a high-entropy alloy.
Further, the weight percentages of the raw materials are respectively as follows: 75-85% of ceramic hard phase, 15-20% of metal binding phase matrix and 2-4% of carbon black, wherein the sum of the weight percentages of the raw materials is 100%.
Further, the weight percentages of the raw materials are respectively as follows: 80% of ceramic hard phase, 17.5% of metal binding phase matrix and 2.5% of carbon black.
Further, the weight ratio of the high-entropy carbonitride to the oxide in the ceramic hard phase is (60-86): (3-10).
Further, the weight ratio of the high-entropy carbonitride to the oxide in the ceramic hard phase is (65-75): (5-8).
Further, the weight ratio of the high-entropy carbonitride to the oxide in the ceramic hard phase is 73: 7.
further, the alloy elements in the high-entropy carbonitride comprise titanium, tungsten and molybdenum; and at least one of tantalum and niobium.
Further, the alloy elements in the high-entropy carbonitride also comprise any one or more of zirconium, vanadium and hafnium.
Further, the preparation of the high-entropy carbonitride comprises the following raw materials in percentage by weight, namely 81-86% of alloy element oxide; 14 to 19 percent of carbon black, and the sum of the weight percent of the raw materials is 100 percent.
Further, the preparation of the high-entropy carbonitride comprises the following raw materials in percentage by weight, namely 85.3% of alloy element oxide; 14.7 percent of carbon black.
Further, the alloying element oxides include titanium dioxide, tungsten trioxide, and molybdenum trioxide; further comprises niobium pentoxide and/or tantalum pentoxide; and the atomic number ratios of the alloy elements added with the oxide are the same.
Further, the weight percentages of titanium dioxide, tungsten trioxide and molybdenum trioxide in the alloy element oxide are respectively as follows: 7% -14.5% of titanium dioxide; 22% -42% of tungsten trioxide; 13% -26% of molybdenum trioxide; the weight percentage of niobium pentoxide and/or tantalum pentoxide in the oxide of the alloy element is 15-36%.
Further, the alloying element oxide further comprises any one or more of zirconium dioxide, vanadium pentoxide and hafnium dioxide.
Further, the oxides in the ceramic hard phase comprise anatase titanium dioxide, tungsten trioxide and molybdenum trioxide; and the weight ratio of the anatase titanium dioxide to the tungsten trioxide to the molybdenum trioxide is (1-5): (2-5): (2-5).
Further, the weight ratio of the anatase titanium dioxide, the tungsten trioxide and the molybdenum trioxide in the ceramic hard phase is 3: 3.5: 3.5.
further, elements in the high-entropy alloy comprise cobalt, nickel and chromium; any one or two elements of iron, manganese, copper, aluminum and molybdenum are also included; and the atomic number ratio of each element in the high-entropy alloy is the same.
Furthermore, the particle size of the high-entropy carbonitride is 1-5 μm, and the particle size of the oxide is 50-800 nm.
Furthermore, the grain diameter of the high-entropy alloy is 3-10 μm.
The invention provides a preparation method of a high-entropy alloy-based composite material for an oily environment wear-resistant part, which comprises the following steps:
(1) preparation of high entropy carbonitride powders
Preparing high-entropy carbonitride powder by using an alloy element oxide and carbon black as raw materials and applying a carbothermic reduction nitridation method;
(2) mixing of raw materials
Ball-milling and mixing the high-entropy carbonitride powder, the high-entropy alloy, the oxide and the carbon black powder obtained in the step (1) according to the proportion, and drying and granulating to obtain a mixture;
(3) press forming
Pressing the mixture obtained in the step (2) to obtain a pressed blank;
(4) sintering
And (4) sintering the pressed compact obtained in the step (3), and cooling along with the furnace to obtain the high-entropy alloy-based composite material for the oily environment wear-resistant part.
Further, in the step (1), the preparation method of the high-entropy carbonitride powder specifically comprises the following steps:
firstly, putting alloy element oxide and carbon black into a ball milling tank, adding grinding balls and a ball milling medium, and then carrying out ball milling to obtain mixed slurry;
drying the obtained mixed slurry, and then performing carbothermal reduction nitridation, wherein the obtained mixed slurry is reacted for 2-4 hours at the reaction temperature of 1400-1600 ℃ to obtain a mixture;
crushing the mixture obtained in the step two to be less than 5 microns to obtain mixture powder;
fourthly, the mixture powder obtained in the third step is subjected to discharge plasma pressureless sintering, and the mixture powder is reacted for 8 to 12min at the reaction temperature of 1400 ℃ and 1600 ℃, and finally the high-entropy carbonitride powder is obtained.
Further, in the step (4), the sintering mode adopts vacuum atmosphere sintering or low-pressure sintering, and the atmosphere is argon; when vacuum atmosphere sintering is adopted, the pressure is 200 Pa-500 Pa; when low-pressure sintering is adopted, the pressure is 2 MPa-5 MP; the sintering temperature is 1400-1600 ℃, and the sintering time is 1-2 h. .
The high-entropy carbonitride/oxide-high-entropy alloy composite material for the oily environment wear-resistant part breaks through a conventional carbide-cobalt/nickel metal ceramic system, and the composite material with excellent corrosion resistance and wear resistance is formed by ceramic phases such as high-entropy carbonitride, in-situ generated carbide, in-situ reaction retained oxide and the like and high-entropy alloy. In the preparation method provided by the invention, micron-level high-entropy carbonitride is prepared firstly, and then the mixture consisting of the high-entropy carbonitride, oxide, carbon black and high-entropy alloy is adopted for sintering. The oxide and the carbon black generate carbide in situ in the sintering process to improve the wettability between the high-entropy carbon nitride and the high-entropy alloy, and the retained part of the superfine oxide can well inhibit abnormal growth of crystal grains, so that the strength and the toughness of the material are greatly improved. Finally, the composite material which is formed by bonding a plurality of ceramic phases through the high-entropy alloy is obtained, the characteristics of corrosion resistance, wear resistance and low heat conduction of the high-entropy compound can be exerted while certain strength is kept, the service life of a wear-resistant part in an oily environment is greatly prolonged, the operation load is reduced due to the low density, and the use cost of related workpieces is comprehensively reduced.
Based on the technical scheme, the embodiment of the invention can at least produce the following technical effects:
(1) the high-entropy alloy-based composite material for the oily environment wear-resistant part and the preparation method thereof provided by the invention have the advantages that the prepared composite cermet material breaks through the metal system of conventional carbides (tungsten carbide and titanium carbide) -cobalt/nickel, the prepared high-entropy carbonitride is used as a ceramic wear-resistant phase, the high-entropy alloy is used as a binding phase, and the whole material presents an integrally balanced high-entropy system. Compared with common carbide, the high-entropy carbonitride has excellent wear resistance, stronger corrosion resistance and lower thermal conductivity. The high-entropy alloy also has excellent corrosion resistance. Compared with the common hard alloy material in the industry, the material has more excellent corrosion resistance and lower heat conductivity, and the service life of the workpiece is greatly prolonged;
(2) according to the high-entropy alloy-based composite material for the oily environment wear-resistant part and the preparation method thereof, in order to improve the bonding strength of the high-entropy carbonitride and the high-entropy alloy matrix in the preparation process, oxide and carbon black are added into the raw materials, and a carbide phase is generated in situ in the sintering process to wrap the high-entropy carbonitride hard phase, so that the strength and toughness of the material are improved. Meanwhile, the remained fine oxide particles can also inhibit the growth of material grains, and the hardness and the wear resistance of the material are improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
First, examples and comparative examples
The high-entropy alloy-based composite material for the oily environment wear-resistant part is prepared in the examples 1 to 9, and the conventional hard alloy and cermet material are prepared in the comparative examples 1 to 5:
1. raw materials:
the particle size of the raw materials is as follows: the grain diameter of the high-entropy carbonitride is 1-5 mu m, and the grain diameter of the oxide is 50-800 nm; the grain diameter of the high-entropy alloy is 3-10 mu m.
The table of the raw materials (in weight percent) for preparing the high entropy carbonitride in the ceramic hard phase is shown in table 1 below;
the table of raw materials (in parts by weight) for preparing oxides in the ceramic hard phase is shown in table 2 below;
the raw material table (in weight percent) for preparing the high-entropy alloy composite material is shown in the following table 3;
TABLE 1 raw material tables (in weight percent) for the preparation of high entropy carbonitrides in the examples and comparative examples
TABLE 2 raw material tables (in parts by weight) of oxides in examples and comparative examples
TABLE 3 EXAMPLES AND COMPARATIVE EXAMPLES A TABLE OF THE MATERIALS FOR THE PRODUCTION OF HIGH-entropy ALLOY COMPOSITES (in weight percent)
2. The preparation method comprises the following steps:
example 1:
(1) preparation of high entropy carbonitride powders
Preparing high-entropy carbonitride powder by using an alloy element oxide and carbon black as raw materials and applying a carbothermic reduction nitridation method;
firstly, putting alloy element oxide and carbon black into a ball milling tank, adding grinding balls and a ball milling medium, and then carrying out ball milling to obtain mixed slurry; the ball milling mode is planetary ball milling, the ball milling medium is alcohol, and the adding amount of the alcohol is added according to the total weight of 900ml/kg of the alloy element oxide and the carbon black;
drying the obtained mixed slurry in an air drying box; the drying temperature is 70 ℃, and the drying time is 6 h; then carrying out carbothermic reduction nitridation, wherein the carbothermic reduction nitridation is carried out in a tubular pusher furnace and is carried out for 3 hours at 1500 ℃ to obtain a mixture;
crushing the mixture obtained in the step two to be less than 5 microns to obtain mixture powder;
fourthly, the mixture powder obtained in the third step is subjected to discharge plasma pressureless sintering, and reacts for 10min at the reaction temperature of 1500 ℃, and finally high-entropy carbonitride powder is obtained.
(2) Mixing of raw materials
Ball-milling and mixing the high-entropy carbonitride powder, the high-entropy alloy, the oxide and the carbon black powder obtained in the step (1) according to the proportion, and adding a forming agent and a ball-milling medium during ball milling; the forming agent is paraffin, the addition amount of the forming agent is 5 percent of the total weight of the raw material powder, and the ball-to-material ratio is 5: 1; the ball milling mode is wet ball milling, planetary ball milling is used, the ball milling medium is alcohol, and the adding amount of the alcohol is added according to the total weight of 900ml/kg of the high-entropy carbonitride powder, the high-entropy alloy, the oxide and the carbon black; the ball milling time is 60 hours, and a ball milling mixture is obtained after ball milling; carrying out spray drying granulation on the ball-milled mixture to obtain a mixture with the particle size range of 50-140 microns;
(3) press forming
Pressing the mixture obtained in the step (2), wherein the pressing mode is cold isostatic pressing, and the pressing pressure is 150 MPa; pressing to obtain a pressed blank;
(4) sintering
Sintering the green compact obtained in the step (3), wherein the sintering mode adopts low-pressure sintering, and the atmosphere is argon; the pressure is 3.5 MP; the sintering temperature is 1500 ℃, and the sintering time is 1.5 h; and cooling along with the furnace to obtain the high-entropy alloy-based composite material for the oily environment wear-resistant part.
Example 2:
(1) preparation of high entropy carbonitride powders
Preparing high-entropy carbonitride powder by using an alloy element oxide and carbon black as raw materials and applying a carbothermic reduction nitridation method;
firstly, putting alloy element oxide and carbon black into a ball milling tank, adding grinding balls and a ball milling medium, and then carrying out ball milling to obtain mixed slurry; the ball milling mode can be roller ball milling, the ball milling medium is alcohol, and the adding amount of the alcohol is added according to the total weight of 950ml/kg of the alloy element oxide and the carbon black;
drying the obtained mixed slurry in an air drying box; the drying temperature is 65 ℃, and the drying time is 6.5 h; then carrying out carbothermic reduction nitridation, wherein the carbothermic reduction nitridation is carried out in a tubular pusher furnace and is carried out for 2 hours at 1600 ℃ to obtain a mixture;
crushing the mixture obtained in the step two to be less than 5 microns to obtain mixture powder;
fourthly, the mixture powder obtained in the third step is subjected to discharge plasma pressureless sintering, and the mixture powder is reacted for 8min at the reaction temperature of 1600 ℃, and finally the high-entropy carbonitride powder is obtained.
(2) Mixing of raw materials
Ball-milling and mixing the high-entropy carbonitride powder, the high-entropy alloy, the oxide and the carbon black powder obtained in the step (1) according to the proportion, and adding a forming agent and a ball-milling medium during ball milling; the forming agent is paraffin, the adding amount of the forming agent is 5.5 percent of the total weight of the raw material powder, and the ball-to-material ratio is 5: 1; the ball milling mode is wet ball milling, planetary ball milling is used, the ball milling medium is alcohol, and the adding amount of the alcohol is added according to the total weight of 850ml/kg of the high-entropy carbonitride powder, the high-entropy alloy, the oxide and the carbon black; the ball milling time is 48h, and a ball milling mixture is obtained after ball milling; carrying out sieve-rubbing granulation on the ball-milled mixture to obtain a mixture with the particle size range of 50-140 microns;
(3) press forming
Pressing the mixture obtained in the step (2), wherein the pressing mode is cold isostatic pressing, and the pressing pressure is 100 MPa; pressing to obtain a pressed blank;
(4) sintering
Sintering the green compact obtained in the step (3), wherein the sintering mode adopts low-pressure sintering, and the atmosphere is argon; the pressure is 5 MP; the sintering temperature is 1450 ℃, and the sintering time is 2 hours; and cooling along with the furnace to obtain the high-entropy alloy-based composite material for the oily environment wear-resistant part.
Example 3:
(1) preparation of high entropy carbonitride powders
Preparing high-entropy carbonitride powder by using an alloy element oxide and carbon black as raw materials and applying a carbothermic reduction nitridation method;
firstly, putting alloy element oxide and carbon black into a ball milling tank, adding grinding balls and a ball milling medium, and then carrying out ball milling to obtain mixed slurry; the ball milling mode can be planetary ball milling, the ball milling medium is alcohol, and the adding amount of the alcohol is added according to the total weight of 850ml/kg of the alloy element oxide and the carbon black;
drying the obtained mixed slurry in an air drying box; the drying temperature is 75 ℃, and the drying time is 5.5 h; then carrying out carbothermic reduction nitridation, wherein the carbothermic reduction nitridation is carried out in a tubular pusher furnace and is carried out for 4 hours at 1400 ℃ to obtain a mixture;
crushing the mixture obtained in the step two to be less than 5 microns to obtain mixture powder;
fourthly, the mixture powder obtained in the third step is subjected to discharge plasma pressureless sintering, and reacts for 12min at the reaction temperature of 1400 ℃, and finally high-entropy carbonitride powder is obtained.
(2) Mixing of raw materials
Ball-milling and mixing the high-entropy carbonitride powder, the high-entropy alloy, the oxide and the carbon black powder obtained in the step (1) according to the proportion, and adding a forming agent and a ball-milling medium during ball milling; the forming agent is paraffin, the adding amount of the forming agent is 4.5 percent of the total weight of the raw material powder, and the ball-to-material ratio is 5: 1; the ball milling mode is wet ball milling, planetary ball milling is used, the ball milling medium is alcohol, and the adding amount of the alcohol is added according to the total weight of 950ml/kg of the high-entropy carbonitride powder, the high-entropy alloy, the oxide and the carbon black; the ball milling time is 72h, and a ball milling mixture is obtained after ball milling; performing roller granulation on the ball-milled mixture to obtain a mixture with the particle size range of 50-140 microns;
(3) press forming
Pressing the mixture obtained in the step (2), wherein the pressing mode is mould pressing, and the pressing pressure is 200 MPa; pressing to obtain a pressed blank;
(4) sintering
Sintering the pressed compact obtained in the step (3), wherein the sintering mode adopts vacuum atmosphere sintering, and the atmosphere is argon; the pressure is 500 Pa; the sintering temperature is 1600 ℃, and the sintering time is 1 h; and cooling along with the furnace to obtain the high-entropy alloy-based composite material for the oily environment wear-resistant part.
Examples 4 to 9:
the preparation method is the same as example 1.
Comparative examples 1 to 5:
the preparation method is the same as example 1.
Thirdly, performance detection:
the high-entropy alloy-based composite material for the oily environment wear-resistant part prepared in example 1 to example 9 and the cermet material prepared in comparative example 1 to comparative example 5 were subjected to performance tests.
1. The detection method comprises the following steps:
hardness, bending strength, fracture toughness: the detection was carried out in GB/T3849.1-2015, GB/T3851-2015 and JBT 12616-2016.
Wear loss: the specific wear resistance is characterized by a reciprocating type friction wear meter, a mating part is a YG8 hard alloy ball, the load is 80N, the reciprocating speed is 1800mm/min, and the test time is 10 min;
self-corrosion current density and immersion corrosion weight loss: the corrosion resistance is tested by soaking corrosion in 2mol/L hydrochloric acid solution and electrochemical corrosion performance, and the electrochemical corrosion performance is tested to obtain the self-corrosion current density; and in the immersion corrosion test, immersion corrosion weight loss data is obtained after the immersion is carried out for 20 days in a 2mol/L hydrochloric acid solution, and the immersion corrosion weight loss is calculated.
2. The results are shown in table 4 below:
TABLE 4 test results
From table 4, it can be seen that the high-entropy carbonitride designed according to the present invention has excellent wear resistance as compared to the general carbonitride solid solution as seen from comparative examples 1, 2. The addition of the oxide and the carbon black designed according to the invention can improve the wettability between the high-entropy alloy and the high-entropy carbonitride, remarkably improve the strength and the toughness of the material, and have excellent corrosion resistance. While components outside the scope of the present invention will likely cause a decrease in material density and mechanical properties due to a mismatch in the ceramic phase to binder phase ratio.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (10)
1. The high-entropy alloy-based composite material for the oily environment wear-resistant part is characterized in that: the preparation method comprises the following raw materials in percentage by weight: 70-90% of ceramic hard phase, 10-25% of metal binding phase matrix and 1.5-5% of carbon black, wherein the sum of the weight percentages of the raw materials is 100%;
the ceramic hard phase comprises high-entropy carbonitride and oxide;
the metal binding phase matrix is a high-entropy alloy.
2. A high-entropy alloy-based composite material for oily environment wear-resistant members, according to claim 1, wherein: the weight percentages of the raw materials are respectively as follows: 75-85% of ceramic hard phase, 15-20% of metal binding phase matrix and 2-4% of carbon black, wherein the sum of the weight percentages of the raw materials is 100%.
3. A high-entropy alloy-based composite material for oily environment wear-resistant members, according to claim 1, wherein: the weight ratio of the high-entropy carbonitride to the oxide in the ceramic hard phase is (60-80): (3-10).
4. A high-entropy alloy-based composite material for oily environment wear-resistant members, according to claim 1, wherein: the alloy elements in the high-entropy carbonitride comprise titanium, tungsten and molybdenum; and at least one of tantalum and niobium.
5. A high-entropy alloy-based composite material for oily environment wear-resistant parts, according to claim 4, wherein: the alloy elements in the high-entropy carbonitride also comprise any one or more of zirconium, vanadium and hafnium.
6. A high-entropy alloy-based composite material for oily environment wear-resistant members, according to claim 1, wherein: the oxides in the ceramic hard phase comprise anatase titanium dioxide, tungsten trioxide and molybdenum trioxide; and the weight ratio of the anatase titanium dioxide to the tungsten trioxide to the molybdenum trioxide is (1-5): (2-5): (2-5).
7. A high-entropy alloy-based composite material for oily environment wear-resistant members, according to claim 1, wherein: elements in the high-entropy alloy comprise cobalt, nickel and chromium; any one or two elements of iron, manganese, copper, aluminum and molybdenum are also included; and the atomic number ratio of each element in the high-entropy alloy is the same.
8. The method for preparing a high-entropy alloy-based composite material for the oily environment wear-resistant part according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:
(1) preparation of high entropy carbonitride powders
Preparing high-entropy carbonitride powder by using an alloy element oxide and carbon black as raw materials and applying a carbothermic reduction nitridation method;
(2) mixing of raw materials
Ball-milling and mixing the high-entropy carbonitride powder, the high-entropy alloy, the oxide and the carbon black powder obtained in the step (1) according to the proportion, and drying and granulating to obtain a mixture;
(3) press forming
Pressing the mixture obtained in the step (2) to obtain a pressed blank;
(4) sintering
And (4) sintering the pressed compact obtained in the step (3), and cooling along with the furnace to obtain the high-entropy alloy-based composite material for the oily environment wear-resistant part.
9. The preparation method of the high-entropy alloy-based composite material for the oily environment wear-resistant part according to claim 8, wherein: in the step (1), the preparation method of the high-entropy carbonitride powder specifically comprises the following steps:
firstly, putting alloy element oxide and carbon black into a ball milling tank, adding grinding balls and a ball milling medium, and then carrying out ball milling to obtain mixed slurry;
drying the obtained mixed slurry, and then performing carbothermal reduction nitridation, wherein the obtained mixed slurry is reacted for 2-4 hours at the reaction temperature of 1400-1600 ℃ to obtain a mixture;
crushing the mixture obtained in the step two to be less than 5 microns to obtain mixture powder;
fourthly, the mixture powder obtained in the third step is subjected to discharge plasma pressureless sintering, and the mixture powder is reacted for 8 to 12min at the reaction temperature of 1400 ℃ and 1600 ℃, and finally the high-entropy carbonitride powder is obtained.
10. The preparation method of the high-entropy alloy-based composite material for the oily environment wear-resistant part according to claim 8, wherein: in the step (4), the sintering mode adopts vacuum atmosphere sintering or low-pressure sintering, and the atmosphere is argon; when vacuum atmosphere sintering is adopted, the pressure is 200 Pa-500 Pa; when low-pressure sintering is adopted, the pressure is 2 MPa-5 MP; the sintering temperature is 1400-1600 ℃, and the sintering time is 1-2 h.
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Denomination of invention: A high entropy alloy matrix composite for wear-resistant parts in oily environment and its preparation method Effective date of registration: 20220630 Granted publication date: 20220125 Pledgee: Huishang Bank Co.,Ltd. Chengdu Jinsha sub branch Pledgor: CHENGDU MET-CERAMICS ADVANCED MATERIALS Co.,Ltd. Registration number: Y2022510000179 |