A high-entropy alloy machining cemented carbide tool material and a preparation method thereof

Abstract

This invention provides a cemented carbide tool material for high-entropy alloy machining and its preparation method, belonging to the field of cemented carbide tool preparation technology. The preparation method provided by this invention includes the following steps: (1) mixing tungsten carbide powder, high-entropy ceramic powder, and cobalt powder and then ball-milling to obtain a pre-alloy powder; (2) adding carbon black powder to the pre-alloy powder and ball-milling, followed by rapid sintering to obtain a cemented carbide tool blank; (3) heat-treating the cemented carbide tool blank to obtain the cemented carbide tool material for high-entropy alloy machining. The results of the embodiments show that the cemented carbide tool material obtained by this invention has a dual-hard phase structure, and the fracture toughness of the cemented carbide tool material is ≥12.3 MPa·m. 1 / 2 Microhardness ≥20.4GPa, flexural strength ≥3380MPa, high temperature (1000℃) hardness ≥18.2GPa.

Description

Technical Field

[0001] This invention relates to the field of cemented carbide tool manufacturing technology, and in particular to a cemented carbide tool material for high-entropy alloy machining and its preparation method. Background Technology

[0002] High-entropy alloys, also known as multi-principal-element alloys, exhibit superior overall performance compared to single-principal-element alloys due to the synergistic effect among their multiple components. Currently, the main preparation methods for high-entropy alloys are high-temperature melting and plastic forming. Their irregular shapes and rough surfaces require subsequent machining, but their superior mechanical properties increase the difficulty of machining and place higher demands on machining tools. Cemented carbide is an important tool material for machining alloys; improving its wear resistance, high-temperature resistance, and cutting clearance performance is crucial for achieving efficient machining of high-entropy alloys.

[0003] Therefore, how to improve the wear resistance, high temperature resistance, and cutting performance of high-entropy alloys has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a cemented carbide tool material for machining high-entropy alloys and its preparation method. The cemented carbide tool material for machining high-entropy alloys prepared by the method provided by this invention has excellent wear resistance, high-temperature resistance, and cutting rejection performance.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] This invention provides a method for preparing cemented carbide tool material for machining high-entropy alloys, comprising the following steps:

[0007] (1) Tungsten carbide powder, high-entropy ceramic powder and cobalt powder are mixed and then ball-milled to obtain pre-alloyed powder;

[0008] (2) Add carbon black powder to the pre-alloyed powder obtained in step (1) and ball mill it, and then perform rapid sintering to obtain a cemented carbide tool blank.

[0009] (3) Heat-treat the cemented carbide tool blank obtained in step (2) to obtain cemented carbide tool material for high entropy alloy machining.

[0010] Preferably, the high-entropy ceramic powder in step (1) is (Hf 0.2 Zr 0.2 Ta 0.2 Nb 0.2 Ti 0.2 )C or (Hf 0.2 Mo 0.2 Ta 0.2 Nb 0.2 Ti0.2 C.

[0011] Preferably, in step (1), the average particle size of tungsten carbide powder is 0.2 to 0.4 μm, the average particle size of high-entropy ceramic powder is 0.07 to 0.11 μm, and the average particle size of cobalt powder is 0.5 to 0.8 μm.

[0012] Preferably, the mass ratio of tungsten carbide powder, high-entropy ceramic powder and cobalt powder in step (1) is (87-92):(5-7):(3-6).

[0013] Preferably, in step (1), the ball milling medium is YG6 cemented carbide, the ball-to-material ratio is (22-25):1, the ball milling speed is 630-770 rpm, and the ball milling time is 19-23 h.

[0014] Preferably, the amount of carbon black powder used in step (2) is 0.04 to 0.06% of the mass of the pre-alloyed powder.

[0015] Preferably, in step (2), the rotor surface and grinding ball material of the ball mill are independently zirconium dioxide, the rotation speed of the ball mill is 210-260 rpm, and the ball-to-material ratio of the ball mill is (35-39):1.

[0016] Preferably, in step (2), the heating rate of the rapid sintering process is 780-880℃ / min, the cooling rate of the rapid sintering process is 30-40℃ / min, the holding temperature of the rapid sintering process is 1070-1120℃, the holding time of the rapid sintering process is 2-3min, and the pressure of the rapid sintering process is 35-50MPa.

[0017] Preferably, the heat treatment operation in step (3) is as follows: the cemented carbide tool blank is first heated to 1210-1230°C at a heating rate of 15-18°C / min and held for 1.5-2.5 min, then cooled to 860-940°C at a heating rate of 40-45°C / min and held for 4-6 min, and finally furnace cooled to room temperature.

[0018] The present invention provides a high-entropy alloy machining cemented carbide tool material prepared by the preparation method described above, wherein the high-entropy alloy machining cemented carbide tool material has a dual-hard phase structure.

[0019] This invention provides a method for preparing cemented carbide tool material for high-entropy alloy machining, comprising the following steps: (1) mixing tungsten carbide powder, high-entropy ceramic powder and cobalt powder and then ball milling to obtain a pre-alloy powder; (2) adding carbon black powder to the pre-alloy powder obtained in step (1) and ball milling, followed by rapid sintering to obtain a cemented carbide tool blank; (3) heat-treating the cemented carbide tool blank obtained in step (2) to obtain cemented carbide tool material for high-entropy alloy machining. The addition of high-entropy ceramic powder in this invention can form a complementary effect with the tungsten carbide matrix, further improving the hardness and high-temperature resistance of the cemented carbide; the addition of carbon black powder has a carbon-supplementing effect, on the one hand preventing performance degradation due to decarburization caused by the reaction between the hard phase and the binder phase during subsequent sintering, and on the other hand strengthening the tungsten carbide / high-entropy ceramic interface to ensure the synergistic effect of tungsten carbide and high-entropy ceramic; heat treatment can homogenize the microstructure, thereby weakening the tip effect of tungsten carbide particles, forming a uniform tungsten carbide / cobalt interface structure, and improving the toughness of the cemented carbide. The results of the examples show that the cemented carbide tool material prepared by the method provided by the present invention has a dual-phase structure and a fracture toughness ≥12.3 MPa·m. 1 / 2 Microhardness ≥20.4GPa, flexural strength ≥3380MPa, high temperature (1000℃) hardness ≥18.2GPa. Detailed Implementation

[0020] This invention provides a method for preparing cemented carbide tool material for machining high-entropy alloys, comprising the following steps:

[0021] (1) Tungsten carbide powder, high-entropy ceramic powder and cobalt powder are mixed and then ball-milled to obtain pre-alloyed powder;

[0022] (2) Add carbon black powder to the pre-alloyed powder obtained in step (1) and ball mill it, and then perform rapid sintering to obtain a cemented carbide tool blank.

[0023] (3) Heat-treat the cemented carbide tool blank obtained in step (2) to obtain cemented carbide tool material for high entropy alloy machining.

[0024] This invention involves mixing tungsten carbide powder, high-entropy ceramic powder, and cobalt powder, followed by ball milling to obtain a pre-alloyed powder.

[0025] In this invention, the average particle size of the tungsten carbide powder is preferably 0.2–0.4 μm; the high-entropy ceramic powder is preferably (Hf 0.2 Zr 0.2 Ta 0.2 Nb 0.2 Ti 0.2 )C or (Hf 0.2 Mo 0.2 Ta0.2 Nb 0.2 Ti 0.2 C. The average particle size of the high-entropy ceramic powder is preferably 0.07–0.11 μm; the average particle size of the cobalt powder is preferably 0.5–0.8 μm, more preferably 0.6–0.7 μm. In this invention, the purity of the tungsten carbide powder, high-entropy ceramic powder, and cobalt powder is independently preferably ≥99.95%. This invention does not have specific limitations on the specific sources of the tungsten carbide powder, high-entropy ceramic powder, and cobalt powder; commercially available products well known to those skilled in the art can be used. By controlling the average particle size of the raw materials, this invention can achieve better and more uniform mixing, thereby improving the density of the material.

[0026] In this invention, the preferred mass ratio of tungsten carbide powder, high-entropy ceramic powder, and cobalt powder is (87-92):(5-7):(3-6), more preferably (88-92):(5-6):(3-6), and even more preferably (88-90):(5-6):(4-5). By controlling the proportions of the raw materials, this invention achieves complementary advantages in the properties of various components.

[0027] In this invention, the ball milling medium is preferably YG6 cemented carbide; the ball-to-material ratio is preferably 22-25:1, more preferably 23-24:1; the ball milling speed is preferably 630-770 rpm, more preferably 650-750 rpm; and the ball milling time is preferably 19-23 hours, more preferably 20-22 hours, and even more preferably 21-22 hours. In this invention, the ball milling is preferably performed in a planetary ball mill. By controlling the ball milling parameters, this invention can achieve a more uniform mixing of the components.

[0028] After obtaining the pre-alloyed powder, the present invention adds carbon black powder to the pre-alloyed powder and ball mills it, and then performs rapid sintering treatment to obtain a cemented carbide tool blank.

[0029] In this invention, the amount of carbon black powder is preferably 0.04-0.06% of the mass of the pre-alloyed powder, more preferably 0.05-0.06%. By adding carbon black powder, this invention can supplement carbon, preventing performance degradation due to decarburization caused by the reaction between the hard phase and the binder phase during subsequent sintering, and strengthening the tungsten carbide / high-entropy ceramic interface to ensure the synergistic effect of tungsten carbide and high-entropy ceramic. By controlling the amount of carbon black powder added, the negative impact of excessive carbon content on material properties can be avoided.

[0030] In this invention, the rotor surface and grinding balls of the ball mill are preferably made of zirconium dioxide; the ball milling speed is preferably 210–260 rpm, more preferably 220–250 rpm, and even more preferably 230–240 rpm; the ball-to-material ratio is preferably (35–39):1, more preferably (36–38):1. This invention does not impose a specific limitation on the mixing time; based on the technical knowledge of those skilled in the art, it is sufficient to ensure that the carbon black powder is uniformly mixed with the other components. By controlling the rotor surface and grinding ball materials, as well as the ball milling parameters during the ball milling process, this invention not only avoids contamination of the raw material powder but also ensures uniform mixing of the components.

[0031] In this invention, the heating rate of the rapid sintering treatment is preferably 780–880 °C / min, more preferably 800–860 °C / min, and even more preferably 820–840 °C / min; the cooling rate of the rapid sintering treatment is preferably 30–40 °C / min, more preferably 32–38 °C / min, and even more preferably 35 °C / min; the holding temperature of the rapid sintering treatment is preferably 1070–1120 °C, more preferably 1090–1100 °C; the holding time of the rapid sintering treatment is preferably 2–3 min; and the pressure of the rapid sintering treatment is preferably 35–50 MPa, more preferably 40–45 MPa. This invention, through rapid sintering treatment, can suppress abnormal grain growth and form fine equiaxed crystals.

[0032] In this invention, the rapid sintering process is preferably performed in a pulsed current sintering apparatus. This invention does not impose any specific limitations on the model of the pulsed current sintering apparatus; any commercially available product well-known to those skilled in the art can be used.

[0033] After obtaining the cemented carbide tool blank, the present invention performs heat treatment on the cemented carbide tool blank to obtain cemented carbide tool material for high entropy alloy machining.

[0034] In this invention, the preferred heat treatment operation is as follows: the cemented carbide tool blank is first heated to 1210–1230°C at a heating rate of 15–18°C / min and held for 1.5–2.5 min; then cooled to 860–940°C at a heating rate of 40–45°C / min and held for 4–6 min; finally, it is furnace cooled to room temperature. This invention, by controlling the heat treatment parameters, can further improve the toughness of cemented carbide.

[0035] This invention first weighs and ball-mills tungsten carbide powder, high-entropy ceramic powder, and cobalt powder according to a certain mass percentage to obtain a pre-alloyed powder. Then, a certain amount of carbon black powder is added to the pre-alloyed powder, followed by rapid sintering and finally heat treatment. The addition of high-entropy ceramic powder can form a complementary effect with the tungsten carbide matrix, further improving the hardness and high-temperature resistance of the cemented carbide. The addition of carbon black powder plays a role in carbon supplementation, on the one hand, preventing performance degradation caused by decarburization due to the reaction between the hard phase and the binder phase during subsequent sintering, and on the other hand, strengthening the tungsten carbide / high-entropy ceramic interface to ensure the synergistic effect of tungsten carbide and high-entropy ceramic. Heat treatment can homogenize the microstructure, thereby reducing the tip effect of tungsten carbide particles, forming a uniform tungsten carbide / cobalt interface structure, and improving the toughness of the cemented carbide.

[0036] This invention addresses the engineering problem of efficient machining of high-entropy alloys using existing cemented carbide tools during the preparation of cemented carbide materials. It employs a series of techniques including high-entropy ceramic powder hardening, carbon component supplementation, rapid sintering, and microstructure homogenization heat treatment. The study investigates the relationship between powder composition, mixed powder preparation process parameters, carbon black powder incorporation process parameters, rapid sintering process, microstructure homogenization treatment process, and the strength, toughness, and high-temperature mechanical properties of cemented carbide. Specifically, it identifies the optimal powder composition, mixed powder preparation process, carbon black powder incorporation process, rapid sintering process, and microstructure homogenization treatment process parameters for cemented carbide tool materials used in machining high-entropy alloys, aiming to maintain high strength, toughness, and high-temperature mechanical properties. This method offers high precision in composition control, strong process stability and repeatability, and can improve the wear resistance, high-temperature resistance, and cutting performance of cemented carbide materials.

[0037] The present invention also provides a high-entropy alloy machining cemented carbide tool material prepared by the preparation method described above, wherein the high-entropy alloy machining cemented carbide tool material has a dual-hard phase structure.

[0038] The carbide cutting tool material provided by this invention has a fracture toughness ≥12.3 MPa·m 1 / 2 It has a microhardness ≥20.4GPa, a flexural strength ≥3380MPa, and a high temperature (1000℃) hardness ≥18.2GPa, exhibiting excellent wear resistance, high temperature resistance, and cutting rejection properties.

[0039] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0040] Example 1

[0041] A method for preparing a cemented carbide tool material for machining high-entropy alloys includes the following steps:

[0042] (1) Tungsten carbide powder, high-entropy ceramic powder, and cobalt powder are mixed and then ball-milled in a planetary ball mill to obtain a pre-alloyed powder; the average particle size of the tungsten carbide powder is 0.4 μm, and the average particle size of the high-entropy ceramic powder is (Hf 0.2 Zr 0.2 Ta 0.2 Nb 0.2 Ti 0.2 The high-entropy ceramic powder has an average particle size of 0.07 μm, the cobalt powder has an average particle size of 0.5 μm, and the purity of the tungsten carbide powder, high-entropy ceramic powder, and cobalt powder is independently ≥99.95%; the mass ratio of the tungsten carbide powder, high-entropy ceramic powder, and cobalt powder is 90:6:4; the ball milling medium is YG6 cemented carbide; the ball-to-material ratio of the ball milling is 25:1, the ball milling speed is 770 rpm, and the ball milling time is 20 h.

[0043] (2) Carbon black powder is added to the pre-alloyed powder obtained in step (1) and ball-milled. Then, rapid sintering is performed in a pulse current sintering device to obtain a cemented carbide tool blank. The amount of carbon black powder is 0.04% of the mass of the pre-alloyed powder. The rotor surface and grinding balls of the ball mill are independently made of zirconium dioxide. The ball milling speed is 260 rpm and the ball-to-material ratio is 39:1. The heating rate of the rapid sintering process is 780℃ / min, the cooling rate of the rapid sintering process is 40℃ / min, the holding temperature of the rapid sintering process is 1070℃, the holding time of the rapid sintering process is 3 min, and the pressure of the rapid sintering process is 40 MPa.

[0044] (3) The cemented carbide tool blank obtained in step (2) is subjected to heat treatment to obtain cemented carbide tool material for high entropy alloy machining; the heat treatment operation is as follows: the cemented carbide tool blank is first heated to 1210°C at a heating rate of 15°C / min and held for 2.5min, then cooled to 860°C at a heating rate of 40°C / min and held for 4min, and finally furnace cooled to room temperature.

[0045] Example 2

[0046] A method for preparing a cemented carbide tool material for machining high-entropy alloys includes the following steps:

[0047] (1) Tungsten carbide powder, high-entropy ceramic powder, and cobalt powder are mixed and then ball-milled in a planetary ball mill to obtain a pre-alloyed powder; the average particle size of the tungsten carbide powder is 0.4 μm, and the average particle size of the high-entropy ceramic powder is (Hf 0.2 Mo 0.2 Ta 0.2 Nb 0.2 Ti0.2 The high-entropy ceramic powder has an average particle size of 0.11 μm, the cobalt powder has an average particle size of 0.8 μm, and the purity of the tungsten carbide powder, high-entropy ceramic powder, and cobalt powder is independently ≥99.95%; the mass ratio of the tungsten carbide powder, high-entropy ceramic powder, and cobalt powder is 88:7:5; the ball milling medium is YG6 cemented carbide; the ball-to-material ratio of the ball milling is 22:1, the ball milling speed is 720 rpm, and the ball milling time is 21 h.

[0048] (2) Carbon black powder is added to the pre-alloyed powder obtained in step (1) and ball-milled. Then, rapid sintering is performed in a pulse current sintering device to obtain a cemented carbide tool blank. The amount of carbon black powder is 0.05% of the mass of the pre-alloyed powder. The rotor surface and grinding balls of the ball mill are independently made of zirconium dioxide. The ball milling speed is 240 rpm and the ball-to-material ratio is 37:1. The heating rate of the rapid sintering process is 830℃ / min, the cooling rate of the rapid sintering process is 35℃ / min, the holding temperature of the rapid sintering process is 1120℃, the holding time of the rapid sintering process is 3 min, and the pressure of the rapid sintering process is 40 MPa.

[0049] (3) The cemented carbide tool blank obtained in step (2) is subjected to heat treatment to obtain cemented carbide tool material for high entropy alloy machining; the heat treatment operation is as follows: the cemented carbide tool blank is first heated to 1220°C at a heating rate of 17°C / min and held for 2.5min, then cooled to 890°C at a heating rate of 45°C / min and held for 5min, and finally furnace cooled to room temperature.

[0050] Example 3

[0051] A method for preparing a cemented carbide tool material for machining high-entropy alloys includes the following steps:

[0052] (1) Tungsten carbide powder, high-entropy ceramic powder, and cobalt powder are mixed and then ball-milled in a planetary ball mill to obtain a pre-alloyed powder; the average particle size of the tungsten carbide powder is 0.3 μm, and the average particle size of the high-entropy ceramic powder is (Hf 0.2 Zr 0.2 Ta 0.2 Nb 0.2 Ti 0.2 The high-entropy ceramic powder has an average particle size of 0.09 μm, the cobalt powder has an average particle size of 0.7 μm, and the purity of the tungsten carbide powder, high-entropy ceramic powder, and cobalt powder is independently ≥99.95%; the mass ratio of the tungsten carbide powder, high-entropy ceramic powder, and cobalt powder is 90:5:5; the ball milling medium is YG6 cemented carbide; the ball-to-material ratio of the ball milling is 24:1, the ball milling speed is 770 rpm, and the ball milling time is 19 h.

[0053] (2) Carbon black powder is added to the pre-alloyed powder obtained in step (1) and ball-milled. Then, rapid sintering is performed in a pulse current sintering device to obtain a cemented carbide tool blank. The amount of carbon black powder is 0.06% of the mass of the pre-alloyed powder. The rotor surface and grinding balls of the ball mill are independently made of zirconium dioxide. The ball milling speed is 230 rpm and the ball-to-material ratio is 38:1. The heating rate of the rapid sintering process is 860℃ / min, the cooling rate of the rapid sintering process is 40℃ / min, the holding temperature of the rapid sintering process is 1120℃, the holding time of the rapid sintering process is 3 min, and the pressure of the rapid sintering process is 40 MPa.

[0054] (3) The cemented carbide tool blank obtained in step (2) is subjected to heat treatment to obtain cemented carbide tool material for high entropy alloy machining; the heat treatment operation is as follows: the cemented carbide tool blank is first heated to 1210°C at a heating rate of 15°C / min and held for 1.5min, then cooled to 860°C at a heating rate of 40°C / min and held for 4min, and finally furnace cooled to room temperature.

[0055] Example 4

[0056] A method for preparing a cemented carbide tool material for machining high-entropy alloys includes the following steps:

[0057] (1) Tungsten carbide powder, high-entropy ceramic powder, and cobalt powder are mixed and then ball-milled in a planetary ball mill to obtain a pre-alloyed powder; the average particle size of the tungsten carbide powder is 0.2 μm, and the average particle size of the high-entropy ceramic powder is (Hf 0.2 Mo 0.2 Ta 0.2 Nb 0.2 Ti 0.2 The high-entropy ceramic powder has an average particle size of 0.07 μm, the cobalt powder has an average particle size of 0.8 μm, and the purity of the tungsten carbide powder, high-entropy ceramic powder, and cobalt powder is independently ≥99.95%; the mass ratio of the tungsten carbide powder, high-entropy ceramic powder, and cobalt powder is 92:5:3; the ball milling medium is YG6 cemented carbide; the ball-to-material ratio of the ball milling is 23:1, the ball milling speed is 670 rpm, and the ball milling time is 19 h.

[0058] (2) Carbon black powder is added to the pre-alloyed powder obtained in step (1) and ball-milled. Then, rapid sintering is performed in a pulse current sintering device to obtain a cemented carbide tool blank. The amount of carbon black powder is 0.04% of the mass of the pre-alloyed powder. The rotor surface and grinding ball material of the ball mill are independently zirconium dioxide. The ball milling speed is 210 rpm and the ball-to-material ratio is 35:1. The heating rate of the rapid sintering process is 780℃ / min, the cooling rate of the rapid sintering process is 30℃ / min, the holding temperature of the rapid sintering process is 1070℃, the holding time of the rapid sintering process is 2 min, and the pressure of the rapid sintering process is 40 MPa.

[0059] (3) The cemented carbide tool blank obtained in step (2) is subjected to heat treatment to obtain cemented carbide tool material for high entropy alloy machining; the heat treatment operation is as follows: the cemented carbide tool blank is first heated to 1230°C at a heating rate of 18°C / min and held for 1.5min, then cooled to 880°C at a heating rate of 40°C / min and held for 4min, and finally furnace cooled to room temperature.

[0060] The properties of the high-entropy alloy cemented carbide cutting tool materials prepared in Examples 1-4 were tested, and the results are shown in Table 1:

[0061] Table 1. Properties of cemented carbide cutting tool materials for high-entropy alloy machining prepared in Examples 1-4

[0062]

[0063]

[0064] As shown in Table 1, the fracture toughness of the cemented carbide cutting tool material prepared by the method provided in this invention is ≥12.3 MPa·m. 1 / 2 It has a microhardness ≥20.4GPa, a flexural strength ≥3380MPa, and a high temperature (1000℃) hardness ≥18.2GPa, exhibiting excellent wear resistance, high temperature resistance, and cutting rejection properties.

[0065] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a cemented carbide tool material for machining high-entropy alloys, comprising the following steps: (1) Tungsten carbide powder, high-entropy ceramic powder and cobalt powder are mixed and then ball-milled to obtain pre-alloyed powder; (2) Add carbon black powder to the pre-alloyed powder obtained in step (1) and ball mill it, and then perform rapid sintering to obtain a cemented carbide tool blank. (3) Heat-treat the cemented carbide tool blank obtained in step (2) to obtain cemented carbide tool material for high entropy alloy machining; In step (1), the high-entropy ceramic powder is (Hf 0.2 Zr 0.2 Ta 0.2 Nb 0.2 Ti 0.2 C or (Hf) 0.2 Mo 0.2 Ta 0.2 Nb 0.2 Ti 0.2 C; In step (2), the amount of carbon black powder used is 0.04~0.06% of the mass of the pre-alloyed powder; The heating rate of the rapid sintering process in step (2) is 780~880℃ / min, the cooling rate of the rapid sintering process is 30~40℃ / min, the holding temperature of the rapid sintering process is 1070~1120℃, the holding time of the rapid sintering process is 2~3min, and the pressure of the rapid sintering process is 35~50MPa. The heat treatment operation in step (3) is as follows: the cemented carbide tool blank is first heated to 1210~1230℃ at a heating rate of 15~18℃ / min and held for 1.5~2.5min, then cooled to 860~940℃ at a heating rate of 40~45℃ / min and held for 4~6min, and finally furnace cooled to room temperature.

2. The preparation method according to claim 1, characterized in that, In step (1), the average particle size of tungsten carbide powder is 0.2~0.4μm, the average particle size of high-entropy ceramic powder is 0.07~0.11μm, and the average particle size of cobalt powder is 0.5~0.8μm.

3. The preparation method according to claim 1 or 2, characterized in that, In step (1), the mass ratio of tungsten carbide powder, high-entropy ceramic powder and cobalt powder is (87~92):(5~7):(3~6).

4. The preparation method according to claim 1, characterized in that, In step (1), the ball milling medium is YG6 cemented carbide, the ball-to-material ratio is (22~25):1, the ball milling speed is 630~770 rpm, and the ball milling time is 19~23 h.

5. The preparation method according to claim 1, characterized in that, In step (2), the rotor surface of the ball mill and the material of the grinding balls are independently zirconium dioxide, the rotation speed of the ball mill is 210~260 rpm, and the ball-to-material ratio of the ball mill is (35~39):

1.

6. The high-entropy alloy machining cemented carbide tool material prepared by the preparation method according to any one of claims 1 to 5, wherein the high-entropy alloy machining cemented carbide tool material has a dual hard phase structure.

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