Metal ceramic cutter taking high-entropy alloy as binder and preparation method of metal ceramic cutter

Abstract

The invention relates to the technical field of metal ceramic materials and metal ceramic cutters, and discloses a metal ceramic cutter with a high-entropy alloy as a binder and a preparation method thereof.The metal ceramic cutter is prepared from, by mass, 5-15 parts of high-entropy alloy powder AlCoCrFeNiMn and 85-95 parts of WC; the high-entropy alloy powder AlCoCrFeNiMn is prepared from the following raw materials in parts by mass through ball milling and alloying. According to the scheme, high strength and good fracture toughness of the tool are kept, meanwhile, crystal grains in the metal ceramic tool can be refined, the hardness of the tool is improved, and therefore the wear resistance of the metal ceramic tool is improved, and the service life of the metal ceramic tool is prolonged; and the high-temperature oxidation resistance of the metal ceramic cutter can be effectively improved, and high hardness can still be kept during high-temperature cutting, so that the high-temperature cutting performance of the cutter is improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal ceramic materials and metal ceramic cutting tools, and in particular to a metal ceramic cutting tool using a high entropy alloy as a binder and a preparation method thereof. Background Art

[0002] Cermet is an alloy material prepared by powder metallurgy and is widely used in military industry, aerospace, mechanical processing, metallurgy, oil drilling, mining tools, electronic communications, construction and other fields.

[0003] Cobalt (Co) is the most widely used metal bonding phase material. Co as a bonding phase material can improve the toughness of the alloy, but it will reduce the hardness, oxidation resistance and corrosion resistance of the alloy. At the same time, as an important strategic resource in my country, Co is becoming more and more expensive as its application in battery materials becomes more and more extensive. The bonding phase commonly used in metal ceramics in industry is the high-entropy alloy CoCrFeNiMn. The room temperature cutting performance and service life of the tools prepared by it are better than those of traditional metal ceramic tools. However, when cutting at high temperature for a long time, the cutting ability of the tool is significantly reduced, and the processing accuracy is also significantly reduced.

[0004] Prior art CN112743080A discloses a method for in-situ integrated preparation of Ti_C_N_-based metal ceramic tool material with high heat resistance, which uses the nanocrystalline Al0.3CoCrFeNiTi high entropy alloy powder prepared according to the atomic percentage of Al:Co:Cr:Fe:Ni:Ti=0.3:1:1:1:1:1 as a binder for metal ceramic tools, and produces tools with the following raw materials in parts by mass: Ti50~58wt%, B4C14~20wt%, BN5~10wt%, WC2~8%, Mo2C 2~8wt%, TaC2~8wt%, AlxCoCrFeNiTi high entropy alloy 8~15wt%. The properties of the produced tools are as follows: room temperature hardness is 22.1GPa; flexural strength is 1036MPa; fracture toughness is 8.4MPa·m1 / 2, at 1000℃, the hardness is 11.9GPa, the flexural strength is 743MPa, and the fracture toughness is 6.1MPa·m1 / 2. However, the prior art still has the following problems: (1) The performance of the cutting tools produced by the prior art is halved at 1000°C, and their high-temperature cutting performance is still relatively low, and the processing accuracy is also significantly reduced; (2) The cutting tools prepared by the prior art have high hardness, low bending strength, and a certain number of abnormally grown grains in the microstructure, which makes the cutting tools brittle and increases the risk of chipping.

[0005] Based on this, a metal ceramic tool with high entropy alloy as binder and a preparation method were proposed, which not only effectively made up for the shortcomings of the existing technology, but also could produce low-cost, high-performance tools, which is of great significance to improving the continuous cutting performance of the tool. Summary of the invention

[0006] The present invention aims to provide a metal ceramic tool with a high entropy alloy as a binder and a preparation method thereof, so as to solve the technical problem that the high-temperature cutting performance of the tool is significantly reduced when the high entropy alloy is used as a binder in the prior art.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a metal ceramic tool with a high entropy alloy as a binder, comprising the following raw materials in mass fractions: 5 to 15 parts of high entropy alloy powder AlCoCrFeNiMn and 85 to 95 parts of WC; the high entropy alloy powder AlCoCrFeNiMn is made by ball milling and alloying the following raw materials in mass fractions.

[0008] The principles and advantages of this solution are:

[0009] 1. Compared with the existing technology, the high-temperature cutting performance of the cutting tools is significantly reduced. This solution optimizes the high-entropy alloy powder formula to significantly improve the high-temperature cutting performance of the metal ceramic cutting tools produced by using it as a binder, thereby effectively ensuring the processing accuracy. Specifically, the cutting performance of the metal ceramic cutting tools produced by this solution is as follows: hardness 91.6~93.5HRA, bending strength 19.9~20.3GPa, fracture toughness 10.1~10.3MPa·m 1 / 2 Its performance does not decrease significantly after high-temperature cutting, which significantly improves the high-temperature cutting performance of the tool, ensures the cutting accuracy during continuous processing, and thus improves the quality of the workpiece.

[0010] 2. In this scheme, high entropy alloy powder AlCoCrFeNiMn is used to replace Co as a binder. The high lattice distortion and hysteresis diffusion effect of high entropy alloys are used to improve the heat resistance of the tool, as well as the high density and grain uniformity formed by hot pressing, and the toughness and heat resistance of metal ceramic tools are comprehensively improved. In addition, this scheme can prepare high-performance tools by combining it with a single tool material WC. On the one hand, it effectively reduces Co consumption and reduces the binder cost of tool production. On the other hand, it significantly improves the high-temperature performance of the tool, effectively reducing costs and increasing efficiency. In addition, the dosage of high entropy alloy powder AlCoCrFeNiMn as a binder in this scheme is as low as 5%, which further reduces the amount of Co in the high entropy alloy powder, thereby further reducing costs.

[0011] 3. This solution can refine the internal grains of metal ceramic tools and increase the hardness of the tools while maintaining the high strength and good fracture toughness of the tools, thereby improving the wear resistance and service life of the metal ceramic tools; it can also effectively improve the high-temperature oxidation resistance of the metal ceramic tools, and still maintain a high hardness during high-temperature cutting, thereby improving the high-temperature cutting performance of the tools.

[0012] Preferably, as an improvement, the raw material mass ratio of the high entropy alloy powder is as follows: the mass ratios of Al, Co, Cr, Fe, Mn and Ni are 5-10:10-20:10-20:20-30:20-25:5-10 respectively.

[0013] Technical effect: This solution adopts the above settings to improve the bonding effect of high entropy alloy powder on the tool raw material WC, thereby improving the strength and toughness of the tool. The applicant found through long-term experiments that if the Al content is too low, the thermal stability will be poor; if the Al content is too high, it will increase the brittleness of the alloy and reduce the toughness and impact resistance of the tool; if the Co content is too low, the tool will be more brittle and chipping will occur due to the low toughness; if the Co content is too high, the production efficiency will be reduced due to high costs; if the Cr content is too low, the strength and hardness will be reduced due to the poor stability of the body-centered cubic phase; if the Cr content is too high, it will cause the unfavorable phase state of the network. The brittleness of the tool increases; if the Fe content is too low, the plasticity will be lower due to the poor stability of the face-centered cubic phase; if the Fe content is too high, the strength will be reduced due to the increase of the body-centered cubic phase; if the Mn content is too low, the strength will be lower due to the change of the precipitation phase; if the Mn content is too high, the hydrogen embrittlement resistance will be reduced due to the influence on phase formation; if the Ni content is too low, the corrosion resistance will be poor due to insufficient corrosion resistance; if the Ni content is too high, the overall performance will be poor due to the easy formation of intermetallic compounds.

[0014] Preferably, as an improvement, the raw materials Al, Co, Cr, Fe, Mn and Ni of the high entropy alloy powder have an average particle size of less than 45 μm and a purity of 99.95%.

[0015] Technical effect: This scheme adopts the above settings to improve the uniformity and dispersion of powder, ensure the uniformity and dispersion of powder, improve sintering performance, reduce the influence of impurities, improve the mechanical properties, corrosion resistance and oxidation resistance of alloy, and ensure process stability. Through these limitations, high-quality high-entropy alloy powder can be produced to meet the application needs of different fields.

[0016] Preferably, as an improvement, the present invention further provides a method for preparing a metal ceramic cutting tool with a high entropy alloy as a binder, comprising the following steps:

[0017] (1) preparing high entropy alloy powder;

[0018] (ii) Preparation of metal ceramic tools:

[0019] Step 1: prepare a mixed powder of WC-AlCoCrFeNiMn by taking a high entropy alloy powder and a WC powder in a mass ratio of 5-15:85-95;

[0020] Step 2: molding the mixture into a metal ceramic tool blank of a certain size;

[0021] Step 3: hot pressing and sintering the metal-ceramic blank at high temperature to form a metal-ceramic tool.

[0022] Technical effect: This scheme adopts the above settings, which is convenient.

[0023] Preferably, as an improvement, in step one, the method of preparing WC-AlCoCrFeNiMn mixed powder from high entropy alloy powder and WC powder is as follows: the two powders are mixed and transferred to a stainless steel ball mill and mixed with ethanol to form a slurry, the amount of anhydrous ethanol added is 200-300 ml / kg, the ball milling speed is 50-60 r / min, the ball milling time is 6-12 h, the ball milling medium is WC-6wt% Co alloy balls, and the ball-to-material ratio is 10-8:1; after ball milling mixing, the slurry is vacuum dried and sieved with an 80-120 mesh sieve to obtain a mixture.

[0024] Technical effect: This scheme adopts the above-mentioned setting, which is convenient for improving the fineness and uniformity of the mixed powder after ball milling, and then preparing the performance of the obtained tool. Specifically, using WC-6wt% Co alloy balls as ball milling media is convenient for improving the grinding effect while avoiding the contamination of the grinding balls to the material; by setting the ball-to-material ratio to 10:1, it is convenient to form finer grains in a shorter time, shorten the ball milling time and improve the strength and toughness of the material. In addition, a high ball-to-material ratio can also reduce the relative movement between the grinding balls and the material, further reducing the contamination of the grinding balls to the material. The applicant has found through long-term experiments that if other ball milling media (such as GCr15 steel balls) are used, the raw materials will be contaminated due to the low hardness. If the ball-to-material ratio is too high, the raw materials will be contaminated and the ball milling medium will be consumed quickly due to direct contact and wear between the balls; if the ball-to-material ratio is too low, the ball milling effect will be poor due to insufficient grinding of the raw materials. If the ball milling speed is too fast, the ball milling medium will be relatively stationary and the ball milling effect will be poor. If the ball milling speed is too slow, the ball milling medium and the ball mill tube will slide relative to each other, resulting in poor ball milling effect. If the ball milling time is too long, the powder particles will agglomerate due to being too fine. If the ball milling time is too short, the ball milling effect will be poor due to insufficient ball milling.

[0025] Preferably, as an improvement, in step 2, the molding pressure is 100-300 MPa.

[0026] Technical effect: This solution adopts the above-mentioned setting to ensure uniform compaction of the powder and improve the density and strength of the tool. The applicant has found through long-term experiments that if the pressure is too high, it may cause excessive compaction of the powder, resulting in too high a density, which in turn increases the internal stress of the tool and increases the risk of cracks and fractures; if the pressure is too low, it may cause insufficient compaction of the powder, resulting in a lower density, making the internal porosity of the sintered tool high, reducing the strength and toughness of the tool, making it more prone to cracks and deformation, increasing the risk of wear and fracture, and reducing the service life of the tool.

[0027] Preferably, as an improvement, in step three, the hot pressing sintering is to vacuum sinter the compact at 1300-1400°C for 0.5-1h, and then sinter it at 1400-1500°C for 1-2h under 5-6MPaAr conditions.

[0028] Technical effect: This scheme adopts the above-mentioned setting to facilitate the preparation of high-performance metal ceramic cutting tools. Specifically, the vacuum environment can reduce the oxidation of the material and maintain the purity of the material. The first sintering temperature and time in this scheme are convenient for promoting the initial densification of the metal ceramic and improving the density of the sintered body; the second sintering pressurization can promote the rearrangement of the grains and improve the microstructure of the material; the second sintering temperature increase can also ensure the complete densification of the material and promote grain refinement, thereby improving the density, strength and toughness of the sintered body. The applicant has found through long-term experiments that if the sintering temperature is too high, the time is too long or the pressure is too high, the grains will grow rapidly, reducing the strength and toughness of the material; and high temperature may volatilize certain components, affecting the chemical composition and properties of the material; it will also increase energy consumption and increase production costs. Even too high pressure may cause cracks inside the material, affecting the strength and toughness of the material. If the sintering temperature is too low, the time is too short or the pressure is too low, it may lead to insufficient sintering, more residual pores, insufficient density and strength of the material, and reduce the performance of the material.

[0029] Preferably, as an improvement, in (i) preparing the high entropy alloy powder, the following steps are included:

[0030] S1. Weigh micron-sized Al, Co, Cr, Fe, Mn, and Ni metal powders, put them into a stainless steel ball mill, add GCr15 steel balls, add anhydrous ethanol, and wet grind them in a planetary ball mill;

[0031] S2. After the ball milling is completed, the slurry is placed in a vacuum dryer and dried in a vacuum to obtain alloyed AlCoCrFeMnNi high entropy alloy powder.

[0032] Technical effect: This scheme adopts the above-mentioned setting to obtain high-performance AlCoCrFeMnNi high-entropy alloy powder. The applicant has found through long-term experiments that if other ball milling media (such as WC-6wt% Co alloy balls) are used, energy waste will be caused due to excessive mass. If other organic solvents are used as ball milling solvents (such as n-heptane), it will easily cause discomfort and lead to safety accidents.

[0033] Preferably, as an improvement, in S1, the ball milling process is as follows: the ball-to-material ratio is 15-10:1, the amount of anhydrous ethanol added is 200-300 ml / kg, wet milling is performed in a planetary ball mill for 40-50 hours, and the ball mill speed is 200-400 r / min.

[0034] Technical effect: This scheme adopts the above-mentioned setting to improve the fineness and uniformity of high entropy alloy powder. The applicant has found through long-term experiments that if the ball-to-material ratio is too high, the ball milling efficiency is low due to the empty grinding of the grinding balls; if the ball milling ratio is too low, the ball milling effect is poor due to insufficient ball milling of the powder; if the amount of anhydrous ethanol added is too high, the ball-inking effect is poor due to the inability of the powder to fully contact; if the amount added is too low, the poor cooling effect leads to adverse effects; if the ball milling speed is too low, the ball milling effect is reduced due to the relative sliding of the ball milling medium and the ball milling jar; if the speed is too high, the ball milling effect is poor due to the relative stillness of the ball milling medium in the ball milling jar; if the wet milling time is too long, the powder is too fine and easy to agglomerate; if the time is too short, the ball milling effect is poor due to insufficient ball milling.

[0035] Preferably, as an improvement, in S2, the vacuum drying is vacuum drying at 60-90° C. for 10-25 h.

[0036] Technical effect: This scheme adopts the above-mentioned setting, which is convenient for operation and has good drying effect. The applicant has found through long-term experiments that if the drying temperature is too high or the time is too long, it may cause sintering between powder particles to form larger agglomerates, affecting the particle size distribution and uniformity of the powder, and it will also affect the subsequent molding and sintering process due to difficulty in redispersion, reducing the performance of the final product; if the temperature is too low or the time is too short, it may cause more moisture to remain in the powder, affecting the fluidity and compaction density of the powder, and the residual moisture will also affect the subsequent molding and sintering process, reducing the performance of the final product. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is the SEM image of the metal ceramic tool with high entropy alloy as binder in Example 1 of the present invention (scale 100 μm).

[0038] Figure 2 This is the SEM image of the metal ceramic tool with high entropy alloy as binder in Example 1 of the present invention (scale 5 μm).

[0039] Figure 3 This is a Vickers hardness test diagram of a metal ceramic cutting tool using a high entropy alloy as a binder in Example 1 of the present invention. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto. Unless otherwise specified, the technical means used in the following examples and experimental examples are conventional means well known to those skilled in the art, and the materials, reagents, etc. used can be obtained from commercial sources.

[0041] Program Overview

[0042] The present invention provides a metal ceramic tool with a high entropy alloy as a binder, comprising the following raw materials in parts by mass: 5 to 15 parts of high entropy alloy powder AlCoCrFeNiMn and 85 to 95 parts of WC; the high entropy alloy powder AlCoCrFeNiMn is made by ball milling and alloying the following raw materials in parts by mass.

[0043] The raw material mass ratio of the high entropy alloy powder is as follows: the mass ratios of Al, Co, Cr, Fe, Mn and Ni are 5-10:10-20:10-20:20-30:20-25:5-10 respectively.

[0044] The average particle size of the raw materials Al, Co, Cr, Fe, Mn and Ni is less than 45 μm and the purity is 99.95%.

[0045] The present invention also provides a method for preparing a metal ceramic cutting tool using a high entropy alloy as a binder, comprising the following steps:

[0046] (1) Preparing a high entropy alloy powder, the method comprising the following steps:

[0047] S1. Weigh micron-sized Al, Co, Cr, Fe, Mn and Ni metal powders and put them into a stainless steel ball mill for wet grinding. The process is as follows: the ball-to-material ratio is 15-10:1, the amount of anhydrous ethanol added is 200-300 ml / kg, and the wet grinding is carried out in a planetary ball mill for 40-50 hours at a ball mill speed of 200-400 r / min.

[0048] S2. After the ball milling is completed, the slurry is placed in a vacuum dryer and vacuum dried at 60-90° C. for 10-25 h to obtain alloyed AlCoCrFeMnNi high entropy alloy powder.

[0049] (ii) Preparation of metal ceramic tools:

[0050] Step 1: Take high entropy alloy powder and WC powder in a mass ratio of 5-15:85-95 to prepare a mixed powder of WC-AlCoCrFeNiMn; the specific steps are as follows: The method for preparing the high entropy alloy powder and WC powder into a WC-AlCoCrFeNiMn mixed powder is as follows: after mixing the two powders, transfer them to a stainless steel ball mill and mix them with ethanol to form a slurry, the amount of anhydrous ethanol added is 200-300 ml / kg, the ball milling speed is 50-60 r / min, the ball milling time is 6-12h, the ball milling medium is WC-6wt% Co alloy balls, and the ball-to-material ratio is 10-8:1; after ball milling mixing, the slurry is vacuum dried and sieved with an 80-120 mesh screen to obtain a mixture.

[0051] Step 2: molding the mixture into a metal ceramic tool blank of a certain size under the condition of 100-300 MPa;

[0052] Step 3: hot-pressing and sintering the metal ceramic body into a metal ceramic tool at high temperature. The specific hot-pressing and sintering conditions are: vacuum sintering the pressed green body at 1300-1400°C for 0.5-1h, and then sintering it at 1400-1500°C for 1-2h under 5-6MPa Ar conditions.

[0053] Example 1

[0054] A method for preparing a metal ceramic cutting tool with a high entropy alloy as a binder comprises the following steps:

[0055] (I) Preparation of high entropy alloy powder:

[0056] S1. Weigh micron-sized Al, Co, Cr, Fe, Mn, and Ni metal powders and put them into a stainless steel ball mill. Add GCr15 steel balls with a ball-to-material ratio of 15:1. Add anhydrous ethanol with an addition amount of 200 ml / kg. Wet-mill in a planetary ball mill for 48 hours at a ball mill speed of 300 r / min.

[0057] S2. After the ball milling is completed, the slurry is placed in a vacuum dryer and vacuum dried at 80° C. for 24 h to obtain alloyed AlCoCrFeMnNi high entropy alloy powder.

[0058] (ii) Preparation of metal ceramic tools:

[0059] Step 1: Take 5g of high entropy alloy powder and 95g of WC powder to prepare a mixed powder of WC-AlCoCrFeNiMn. Transfer the mixed powder to a stainless steel ball mill and mix it with ethanol. The amount of ethanol added is 200ml / kg, the ball milling speed is 56r / min, the ball milling time is 6h, the ball milling medium is WC-6wt%Co alloy ball, and the ball-to-material ratio is 10:1. After mixing, the slurry is vacuum dried and sieved with an 80-mesh screen to obtain a mixed material.

[0060] Step 2: Press the molded mixture into a metal ceramic tool blank with a size under a pressure of 250 MPa.

[0061] Step 3: hot-press and sinter the metal-ceramic green body into a metal-ceramic tool at high temperature, vacuum sinter the green body at 1310°C for 0.5h, and then sinter it at 1420°C for 1h under 5MPa Ar conditions.

[0062] In addition, the preparation methods of the cutting tools in Examples 2 to 3 and Comparative Examples 1 to 6 are basically the same as in Example 1, and the differences are detailed in Table 1.

[0063] Table 1 Differences between Examples 1 to 3 and Comparative Examples 1 to 6

[0064]

[0065] Experimental Example 1: Tool Performance Testing

[0066] The performance of the tools obtained in the above Examples 1 to 3 and Comparative Examples 1 to 6 was tested according to the ISO 6507-2:2018 Vickers hardness test (Part 2). The results are shown in Table 2. The results of the scanning electron microscope (SEM) test of the tool obtained in Example 1 are shown in Table 3. Figures 1 to 3 .

[0067] Table 2 Performance test results

[0068]

[0069] Experimental data show that the metal ceramic tool prepared by using high entropy alloy as a binder in this scheme exhibits good performance. However, if Co / Al combination is used as a binder, the performance of the metal ceramic tool prepared is significantly reduced, especially the bending strength.

[0070] In summary, this scheme optimizes the formula of high entropy alloy powder to significantly improve the high-temperature cutting performance of the metal ceramic tool produced by using it as a binder, thereby effectively ensuring the processing accuracy. Specifically, the cutting performance of the metal ceramic tool produced by this scheme is as follows: hardness 91.6~93.5HRA, bending strength 19.9~20.3GPa, fracture toughness 10.1~10.3MPa·m 1 / 2 Its performance does not decrease significantly after high-temperature cutting, which significantly improves the high-temperature cutting performance of the tool, ensures the cutting accuracy during continuous processing, and thus improves the quality of the workpiece.

[0071] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A metal ceramic tool with a high entropy alloy as a binder, characterized in that: The invention comprises the following raw materials in parts by weight: 5 to 15 parts of high entropy alloy powder AlCoCrFeNiMn and 85 to 95 parts of WC; the high entropy alloy powder AlCoCrFeNiMn is prepared by ball milling and alloying the following raw materials in parts by weight.

2. The metal ceramic tool with a high entropy alloy as a binder according to claim 1, characterized in that: The raw material mass ratio of the high entropy alloy powder is as follows: the mass ratios of Al, Co, Cr, Fe, Mn and Ni are 5-10:10-20:10-20:20-30:20-25:5-10 respectively.

3. The metal ceramic tool with high entropy alloy as binder according to claim 2, characterized in that: The average particle size of the raw materials Al, Co, Cr, Fe, Mn and Ni of the high entropy alloy powder is less than 45 μm, and the purity is 99.95%.

4. The method for preparing a metal ceramic tool with a high entropy alloy as a binder according to any one of claims 1 to 3, characterized in that: The following steps are involved: (1) preparing high entropy alloy powder; (ii) Preparation of metal ceramic tools: Step 1: prepare a mixed powder of WC-AlCoCrFeNiMn by taking a high entropy alloy powder and a WC powder in a mass ratio of 5-15:85-95; Step 2: molding the mixture into a metal ceramic tool blank of a certain size; Step 3: hot pressing and sintering the metal-ceramic blank at high temperature to form a metal-ceramic tool.

5. A metal ceramic tool with a high entropy alloy as a binder and a preparation method thereof according to claim 4, characterized in that: In step one, a method for preparing a WC-AlCoCrFeNiMn mixed powder from a high entropy alloy powder and a WC powder is as follows: the two powders are mixed and transferred to a stainless steel ball mill, mixed with ethanol and ball milled into a slurry, the amount of anhydrous ethanol added is 200-300 ml / kg, the ball milling speed is 50-60 r / min, the ball milling time is 6-12 h, the ball milling medium is a WC-6wt% Co alloy ball, and the ball-to-material ratio is 10-8:1; after ball milling mixing, the slurry is vacuum dried and sieved with an 80-120 mesh sieve to obtain a mixed material.

6. A metal ceramic tool with a high entropy alloy as a binder and a preparation method thereof according to claim 4, characterized in that: In step 2, the molding pressure is 100-300 MPa.

7. The metal ceramic tool with high entropy alloy as binder and the preparation method thereof according to claim 4, characterized in that: In step three, the hot pressing sintering is to vacuum sinter the compact at 1300-1400° C. for 0.5-1 h, and then sinter it at 1400-1500° C. for 1-2 h under 5-6 MPa Ar conditions.

8. The metal ceramic tool with high entropy alloy as binder and the preparation method thereof according to claim 4, characterized in that: In (i) preparing high entropy alloy powder, the following steps are included: S1. Weigh micron-sized Al, Co, Cr, Fe, Mn, and Ni metal powders, put them into a stainless steel ball mill, add GCr15 steel balls, add anhydrous ethanol, and wet grind them in a planetary ball mill; S2. After the ball milling is completed, the slurry is placed in a vacuum dryer and dried in a vacuum to obtain alloyed AlCoCrFeMnNi high entropy alloy powder.

9. A metal ceramic tool with a high entropy alloy as a binder and a preparation method thereof according to claim 8, characterized in that: In S1, the ball milling process is as follows: the ball-to-material ratio is 15-10:1, the amount of anhydrous ethanol added is 200-300 ml / kg, wet milling is performed in a planetary ball mill for 40-50 h, and the ball mill speed is 200-400 r / min.

10. The metal ceramic cutting tool with high entropy alloy as binder and the preparation method thereof according to claim 8, characterized in that: In S2, the vacuum drying is performed at 60 to 90°C for 10 to 25 hours.

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