Tungsten carbide powder preparation method and tungsten carbide powder
By thermal shock, airflow crushing, hydrogen reduction and in-situ carbonization treatment on tungsten trioxide, high dispersion nanotungsten carbide powder is prepared, which solves the problem of difficulty in preparing nanotungsten carbide powder at low cost in the prior art, and realizes the preparation of high-performance nanotungsten carbide powder.
Patent Information
- Application Number
- CN202411720346.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-02-28
AI Technical Summary
It is difficult for the existing technology to prepare high-performance nano-tungsten carbide powder at a low cost and large-scale basis, resulting in domestic dependence on imported foreign products.
High dispersion nanotungsten carbide powder was prepared by thermal shock treatment, airflow crushing and staging treatment, hydrogen reduction treatment, and in-situ carbonization treatment under a hydrogen atmosphere.
The preparation of high-purity and high-activity nanotungsten carbide powder has been achieved, and the problems of the growth, agglomeration and wide particle size distribution of nanotungsten particles in traditional methods are solved, and it has wide application prospects.
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Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of nano material preparation, and in particular to a tungsten carbide powder preparation method and tungsten carbide powder. Background Art
[0002] Tungsten carbide has the advantages of high hardness, high melting point, high wear resistance, etc. It is used as a base material to manufacture cutting tools, molds and wear-resistant parts. It is widely used in aerospace, precision machining, electronics industry and other fields. With the rapid development of my country's economy and the structural upgrading of the manufacturing industry, the aerospace, precision machining / manufacturing, electronics industry and other fields are developing rapidly. The requirements for precision cutting of high-temperature alloy materials, light alloy materials such as titanium / aluminum, high-hardness steel mold materials, composite materials and printed circuit board materials are increasing rapidly, requiring cemented carbide materials to have higher hardness, higher heat resistance, higher strength and toughness. However, cemented carbide with ordinary structure has a contradiction between hardness and strength matching.
[0003] In response to this problem, domestic and foreign scholars have conducted a lot of research and found that when the grain size of cemented carbide tungsten carbide is reduced to below the nanometer level, the hardness, toughness, strength, etc. of the material can be improved significantly. The basis for preparing nanocrystalline cemented carbide is the preparation of high-performance nano tungsten carbide powder. At present, there are no mature products in China, and currently it mainly relies on importing foreign nano tungsten carbide. Therefore, the low-cost, large-scale and controllable preparation of high-quality nano tungsten carbide powder is a technical problem that needs to be solved urgently.
[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure. Summary of the invention
[0005] The purpose of the present disclosure is to provide a method for preparing tungsten carbide powder and tungsten carbide powder, thereby overcoming the technical problem of being unable to prepare nano tungsten carbide powder at low cost due to the limitations of related technologies, at least to a certain extent.
[0006] Other features and advantages of the present disclosure will become apparent from the following detailed description, or may be learned in part by the practice of the present disclosure.
[0007] According to a first aspect of the present disclosure, a method for preparing tungsten carbide powder is provided, comprising:
[0008] Performing thermal shock treatment on the original tungsten trioxide to obtain treated tungsten trioxide; the defects of the treated tungsten trioxide are higher than those of the original tungsten trioxide;
[0009] The treated tungsten trioxide is subjected to air flow crushing and classification treatment to obtain nano-scale tungsten trioxide powder;
[0010] Performing hydrogen reduction treatment on the nano-scale tungsten trioxide powder to obtain initial tungsten powder;
[0011] Adding the initial tungsten powder, dispersant and water-soluble carbon source into a solvent and heating and mixing them to obtain a mixture;
[0012] The mixture is dried and then carbonized to obtain nano-scale tungsten carbide powder.
[0013] In an exemplary embodiment of the present disclosure, the thermal shock treatment of the original tungsten trioxide to obtain the treated tungsten trioxide includes:
[0014] Performing a preset number of thermal shock treatments on the original tungsten trioxide to obtain treated tungsten trioxide; the preset number of times is 2 to 8 times;
[0015] Each thermal shock treatment includes heating the original tungsten trioxide to a specified temperature and keeping it warm for a preset time, and then cooling it with liquid nitrogen after taking it out;
[0016] The specified temperature is 400° C. to 600° C., and the preset time is 10 min to 150 min.
[0017] In an exemplary embodiment of the present disclosure, the air flow crusher pressure used in the air flow crushing and classification process is 0.5 MPa to 1 MPa.
[0018] In an exemplary embodiment of the present disclosure, the step of subjecting the nanoscale tungsten trioxide powder to hydrogen reduction to obtain initial tungsten powder comprises:
[0019] Placing the nanoscale tungsten trioxide powder in a designated reaction container for hydrogen reduction treatment to obtain the initial tungsten powder;
[0020] Wherein, the designated reaction container has the function of guiding the flow direction of hydrogen gas.
[0021] In an exemplary embodiment of the present disclosure, the reduction temperature used in the hydrogen reduction treatment is 400° C. to 850° C.
[0022] In an exemplary embodiment of the present disclosure, the dispersant is polyvinyl alcohol or polyethylene glycol.
[0023] In an exemplary embodiment of the present disclosure, the water-soluble carbon source is glucose or sucrose.
[0024] In an exemplary embodiment of the present disclosure, the carbonization temperature used in the carbonization treatment is 1200° C. to 1400° C., and the insulation time after reaching the carbonization temperature is 3 h to 6 h.
[0025] In an exemplary embodiment of the present disclosure, the hydrogen flow rate used in the carbonization treatment is 2L-10L, and the dew point of hydrogen is less than -20°C. According to a second aspect of the present disclosure, a tungsten carbide powder is provided, characterized in that it is prepared by the tungsten carbide powder preparation method described in the first aspect above.
[0026] It can be seen from the above technical solutions that the method for preparing tungsten carbide powder in the exemplary embodiment of the present disclosure has at least the following advantages and positive effects:
[0027] In the technical solutions provided by some embodiments of the present disclosure, on the one hand, by subjecting the original tungsten trioxide to thermal shock treatment, a treated high-defect tungsten trioxide is obtained, and a large number of defects, such as dislocations, vacancies, etc., can be introduced based on the thermal shock treatment. The presence of defects enhances the surface activity of the tungsten trioxide, which is beneficial to subsequent chemical reactions, such as hydrogen reduction treatment; further, the treated tungsten trioxide is subjected to air flow crushing and classification treatment to obtain nano-scale tungsten trioxide powder, and the tungsten trioxide particles can be crushed into nano-scale based on air flow crushing, thereby reducing the particle size, increasing the surface area, and improving the reaction activity. Based on the classification treatment, the particle size distribution is narrow, the standard deviation is small, there is no obvious size difference, and the dispersion is improved. degree, which will help to obtain high-purity and high-activity tungsten powder in the future; on the other hand, the tungsten trioxide powder is subjected to hydrogen reduction treatment to obtain initial tungsten powder, the initial tungsten powder, dispersant and water-soluble carbon source are added to the solvent for heating and mixing to obtain a mixture, and the mixture is dried and carbonized to obtain nano-scale tungsten carbide powder. On the basis of obtaining initial tungsten powder with higher purity, the dispersant can be used to prevent particle agglomeration and ensure that the initial tungsten powder and the water-soluble carbon source are evenly dispersed in the solvent. The water-soluble carbon source can be evenly coated on the surface of the tungsten powder during the heating process, which is convenient for subsequent in-situ carbonization under a hydrogen atmosphere, thereby obtaining highly dispersed nano-tungsten carbide powder, which has broad application prospects in the fields of cemented carbide and coating materials.
[0028] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.
[0030] Figure 1 A schematic diagram showing a process of preparing tungsten carbide powder in an embodiment of the present disclosure;
[0031] Figure 2 A schematic diagram showing a specific process of the first method for preparing tungsten carbide powder in an embodiment of the present disclosure is shown;
[0032] Figure 3 The SEM image of the tungsten carbide powder prepared by Example 1 in the present disclosure is shown;
[0033] Figure 4 A specific schematic diagram showing a second method for preparing tungsten carbide powder in an embodiment of the present disclosure is shown;
[0034] Figure 5 The SEM image of the tungsten carbide powder prepared by Example 2 in the present disclosure is shown. DETAILED DESCRIPTION
[0035] The following is an explanation of the implementation of the present disclosure by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification.
[0036] It should be noted that the process equipment or devices not specifically specified in the following embodiments are all conventional equipment or devices in the art.
[0037] In addition, it should be understood that one or more method steps mentioned in the present disclosure do not exclude the existence of other method steps before or after the combination step or the insertion of other method steps between these explicitly mentioned steps, unless otherwise specified; it should also be understood that the combination connection relationship between one or more devices / apparatuses mentioned in the present disclosure does not exclude the existence of other devices / apparatuses before or after the combination device / apparatus or the insertion of other devices / apparatuses between these explicitly mentioned two devices / apparatuses, unless otherwise specified. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or to limit the scope of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the present disclosure without substantially changing the technical content.
[0038] In view of the shortcomings of the prior art, the present invention aims to propose a method for preparing highly dispersed nano-tungsten carbide powder. The method increases the defects of tungsten trioxide powder, improves the dispersibility and particle size distribution of powder by means of cyclic rapid heating and cooling, air flow crushing, powder classification, etc., and quickly discharges the water vapor in the reaction process by regulating the flow direction of hydrogen in the reduction process, reduces the volatilization and deposition of tungsten oxide in the hydrogen reduction process, and inhibits the grain coarsening in the reduction process, thereby solving the problems of nano-tungsten particle growth, agglomeration and wide particle size distribution in the traditional hydrogen reduction process. The nano-tungsten powder is coated with a water-soluble carbon source to facilitate the subsequent in-situ carbonization in a hydrogen atmosphere, and finally highly dispersed nano-tungsten carbide is obtained.
[0039] Next, the method for preparing tungsten carbide powder in the embodiment of the present disclosure is specifically described. Specifically, refer to Figure 1 , Figure 1 The schematic flow chart of the method for preparing tungsten carbide powder in the embodiment of the present disclosure is shown, including steps S110 to S150:
[0040] In step S110, the original tungsten trioxide is subjected to a thermal shock treatment to obtain a treated tungsten trioxide; the defects of the treated tungsten trioxide are higher than those of the original tungsten trioxide;
[0041] In step S120, the treated tungsten trioxide is subjected to air flow crushing and classification treatment to obtain nano-scale tungsten trioxide powder;
[0042] In step S130, the nanoscale tungsten trioxide powder is subjected to hydrogen reduction treatment to obtain initial tungsten powder;
[0043] In step S140, the initial tungsten powder, the dispersant and the water-soluble carbon source are added to a solvent and heated and mixed to obtain a mixture;
[0044] In step S150, the mixture is dried and then carbonized to obtain nano-scale tungsten carbide powder.
[0045] exist Figure 1 In the technical solution provided by the illustrated embodiment, on the one hand, by subjecting the original tungsten trioxide to thermal shock treatment, a treated high-defect tungsten trioxide is obtained, and a large number of defects, such as dislocations, vacancies, etc., can be introduced based on the thermal shock treatment. The presence of defects enhances the surface activity of the tungsten trioxide, which is beneficial to subsequent chemical reactions, such as hydrogen reduction treatment; further, the treated tungsten trioxide is subjected to air flow crushing and classification treatment to obtain nano-scale tungsten trioxide powder, and the tungsten trioxide particles can be crushed into nano-scale based on air flow crushing, thereby reducing the particle size, increasing the surface area, and improving the reaction activity. Based on the classification treatment, the particle size distribution is narrow, the standard deviation is small, and there is no obvious size difference, thereby improving the dispersion, so that the subsequent It helps to obtain high-purity and high-activity tungsten powder; on the other hand, the nano-scale tungsten trioxide powder is subjected to hydrogen reduction treatment to obtain initial tungsten powder, the initial tungsten powder, dispersant and water-soluble carbon source are added to a solvent for heating and mixing to obtain a mixture, and the mixture is dried and carbonized to obtain nano-scale tungsten carbide powder. On the basis of obtaining initial tungsten powder with higher purity, the dispersant can be used to prevent particle agglomeration and ensure that the initial tungsten powder and the water-soluble carbon source are evenly dispersed in the solvent. The water-soluble carbon source can be evenly coated on the surface of the tungsten powder during the heating process, which is convenient for subsequent in-situ carbonization under a hydrogen atmosphere, thereby obtaining highly dispersed nano-tungsten carbide powder, which has broad application prospects in the fields of cemented carbide and coating materials.
[0046] The following Figure 1The specific implementation process of each step is described in detail:
[0047] In step S110, the original tungsten trioxide is subjected to a thermal shock treatment to obtain treated tungsten trioxide; the defects of the treated tungsten trioxide are higher than those of the original tungsten trioxide.
[0048] In this step, the original tungsten trioxide may be subjected to a preset number of thermal shock treatments to obtain treated tungsten trioxide.
[0049] Specifically, each thermal shock treatment can be: placing the original tungsten trioxide in a crucible and placing it in a high-temperature muffle furnace to heat it to a specified temperature, which can be 400°C to 600°C, and keeping it warm for a preset time (10min to 150min), then quickly taking it out and quickly cooling it with liquid nitrogen. By cyclically performing the thermal shock treatment 2 to 8 times, the treated tungsten trioxide can be obtained.
[0050] The treated tungsten trioxide can also be called high-defect tungsten trioxide. For example, high defects can be reflected in dislocations, vacancies, cracks, grain boundaries, etc. in the internal crystal. Dislocations refer to linear defects in crystals, which can be edge dislocations, screw dislocations or mixed dislocations. Vacancies refer to point defects in crystals, i.e., missing atoms at lattice positions, etc. Cracks refer to linear or planar defects in materials, which may lead to the fracture of materials. Grain boundaries refer to interfaces between adjacent grains in polycrystalline materials, etc.
[0051] In step S120, the treated tungsten trioxide is subjected to air flow crushing and classification treatment to obtain nano-scale tungsten trioxide powder.
[0052] In this step, an air flow crusher may be used to crush and grade the treated tungsten trioxide obtained in step S110 to obtain nano-scale tungsten trioxide powder, wherein the pressure of the air flow crusher may be 0.5 MPa to 1 MPa.
[0053] It should be noted that, under an electron microscope, the tungsten trioxide powder obtained in the present invention is nanometer-sized, and the tungsten trioxide powder is a tungsten trioxide powder with high dispersion. For example, the dispersion can be measured according to the particle size distribution width or the specific surface area. For example, when the specific surface area is greater than 2m 2 / g can be regarded as high dispersion.
[0054] The "high dispersion" of high-dispersion tungsten trioxide powder refers to the uniform distribution of tungsten trioxide nanoparticles in space, without obvious agglomeration, and good dispersion and uniformity. This material has a large specific surface area, can improve the reaction activity, and is suitable for a variety of high-end application fields, such as cemented carbide, coating materials, etc.
[0055] In step S130, the nano-scale tungsten trioxide powder is subjected to hydrogen reduction treatment to obtain initial tungsten powder.
[0056] In this step, the nano-scale tungsten trioxide powder obtained in step S120 can be placed in a designated reaction container for hydrogen reduction treatment to obtain initial tungsten powder. The reduction temperature used in the hydrogen reduction treatment can be 400°C to 850°C. The hydrogen reduction treatment refers to the process of heating the nano-scale tungsten trioxide powder in a hydrogen atmosphere (H 2 ) environment, remove tungsten trioxide (WO 3 ) and reduce it to metallic tungsten (W). This process is usually carried out at high temperatures to ensure that the reduction reaction can proceed fully.
[0057] The designated reaction container has the function of guiding or changing the flow direction of hydrogen gas. Specifically, it can make the hydrogen gas pass through the material layer from the bottom to the top. Exemplarily, the designated reaction container can be a crucible that can change the flow direction of hydrogen gas.
[0058] In step S140, initial tungsten powder, dispersant and water-soluble carbon source are added into a solvent and heated and mixed to obtain a mixture.
[0059] In this step, the initial tungsten powder, dispersant and water-soluble carbon source obtained in step S130 may be added to a solvent, heated and mixed, and stirred to obtain a mixture.
[0060] Exemplarily, the solvent may be deionized water, the dispersant may be polyvinyl alcohol (PVA) or polyethylene glycol (PEG), and the water-soluble carbon source may be glucose or sucrose.
[0061] In step S150, the mixture is dried and then carbonized to obtain nano-scale tungsten carbide powder.
[0062] In this step, the mixture obtained in the above step S140 can be dried and then carbonized to obtain nano-scale tungsten carbide powder, and the tungsten carbide powder is a highly dispersed tungsten carbide powder. Carbonization refers to the process of combining elements in a certain compound or mixture with carbon through chemical reactions under specific conditions to form carbides.
[0063] The carbonization temperature used in the carbonization treatment may be 1200°C to 1400°C, the insulation time after reaching the carbonization temperature may be 3h to 6h, and the hydrogen flow rate used in the carbonization treatment may be 2L to 10L, and the dew point of the hydrogen may be <-20°C.
[0064] The solution of the embodiment of the present disclosure is described in detail below through specific examples.
[0065] Example 1
[0066] refer to Figure 2 , Figure 2 The specific process diagram of the first method for preparing tungsten carbide powder in the embodiment of the present disclosure is shown, which includes the following steps S201-S205:
[0067] In step S201, 1000 g of tungsten trioxide is placed in a crucible and placed in a 550° C. high-temperature muffle furnace for heating and heat preservation for 100 minutes, and then quickly taken out and quickly cooled with liquid nitrogen, and the cycle is repeated twice to obtain high-defect tungsten trioxide;
[0068] In step S202, the high-defect tungsten trioxide powder obtained in step S201 is subjected to air flow crushing and classification at a pressure of 0.8 MPa to obtain nano-scale highly dispersed tungsten trioxide powder;
[0069] In step S203, the highly dispersed tungsten trioxide powder obtained in S202 is placed in a crucible for hydrogen reduction to prepare nano tungsten powder, the reduction temperature is 850° C., and the reduction time is 3 h;
[0070] In step S204, the nano tungsten powder obtained in step S203, PVA and glucose are added to deionized water and heated and stirred to mix evenly, wherein the amount of PVA added is 0.5% of the mass of the nano tungsten powder, and the amount of glucose added is 16% of the mass of the nano tungsten powder;
[0071] In step S205, after the mixture obtained in step S204 is dried, it is carbonized in a hydrogen atmosphere to prepare highly dispersed nano-tungsten carbide. The carbonization temperature is 1300°C, the carbonization time is 4h, and the hydrogen flow rate is 5L.
[0072] refer to Figure 3 , Figure 3 The SEM (Scanning Electron Microscopy) image of the tungsten carbide powder prepared by Example 1 in the present disclosure is shown. The scale of the image is 300 nm, and the average particle size of the tungsten carbide powder is about 114 nm.
[0073] Example 2
[0074] refer to Figure 4 , Figure 4 The specific process diagram of the second method for preparing tungsten carbide powder in the embodiment of the present disclosure is shown, which includes the following steps S401-S405:
[0075] In step S401, 1000 g of tungsten trioxide is placed in a crucible and placed in a 550° C. high-temperature muffle furnace for heating and heat preservation for 100 minutes, and then quickly taken out and quickly cooled with liquid nitrogen, and the cycle is repeated twice to obtain high-defect tungsten trioxide;
[0076] In step S402, the tungsten trioxide powder obtained in step S401 is crushed and classified by air flow at a pressure of 0.8 MPa to obtain nano-scale highly dispersed tungsten trioxide powder;
[0077] In step S403, the nano-scale highly dispersed tungsten trioxide powder obtained in step S402 is placed in a crucible for hydrogen reduction to prepare nano-tungsten powder, with the reduction temperature being 800° C. and the reduction time being 4 hours;
[0078] In step S404, the nano tungsten powder obtained in step S403, PVA and glucose are added to deionized water and heated and stirred to mix evenly, wherein the amount of PVA added is 0.8% of the mass of the nano tungsten powder, and the amount of glucose added is 17% of the mass of the nano tungsten powder;
[0079] In step S405, after the mixture obtained in step S404 is dried, it is carbonized in a hydrogen atmosphere to prepare highly dispersed nano-tungsten carbide. The carbonization temperature is 1350°C, the carbonization time is 3h, and the hydrogen flow rate is 3L.
[0080] refer to Figure 5 , Figure 5 The SEM image of the tungsten carbide powder prepared by Example 2 in the present disclosure is shown. The scale of the image is 300 nm, and the average particle size of the tungsten carbide powder is about 137 nm.
[0081] Based on the above technical solution, the present invention has the following advantages compared with the prior art:
[0082] First, the present invention improves the defects and reaction activity of tungsten trioxide, improves the particle size and dispersibility of powder, and provides a basis for the subsequent preparation of nano tungsten powder and nano tungsten carbide by rapidly heating and cooling, air flow crushing, and grading commercial tungsten trioxide;
[0083] Second, a water-soluble organic carbon source is used to evenly mix the organic carbon source and nano-tungsten powder, thereby improving the mixing uniformity and coating of tungsten powder and carbon source, facilitating in-situ carbonization in the subsequent final carbonization stage and improving the reaction efficiency.
[0084] Third, the raw materials used in the present invention are common commercial tungsten trioxide and organic carbon, which have a wide range of sources, low cost, easy promotion, and high industrial application prospects.
[0085] It should be noted that the above embodiments are only illustrative of the principles and effects of the present disclosure, and are not intended to limit the present disclosure. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present disclosure. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present disclosure should still be covered by the claims of the present disclosure.
Claims
1. A method for preparing tungsten carbide powder, characterized in that: include: Performing thermal shock treatment on the original tungsten trioxide to obtain treated tungsten trioxide; the defects of the treated tungsten trioxide are higher than those of the original tungsten trioxide; The treated tungsten trioxide is subjected to air flow crushing and classification treatment to obtain nano-scale tungsten trioxide powder; Performing hydrogen reduction treatment on the nano-scale tungsten trioxide powder to obtain initial tungsten powder; Adding the initial tungsten powder, dispersant and water-soluble carbon source into a solvent and heating and mixing them to obtain a mixture; The mixture is dried and then carbonized to obtain nano-scale tungsten carbide powder.
2. The method according to claim 1, characterized in that The method of subjecting the original tungsten trioxide to thermal shock treatment to obtain treated tungsten trioxide comprises: Performing a preset number of thermal shock treatments on the original tungsten trioxide to obtain treated tungsten trioxide; the preset number of times is 2 to 8 times; Each thermal shock treatment includes heating the original tungsten trioxide to a specified temperature and keeping it warm for a preset time, and then cooling it with liquid nitrogen after taking it out; The specified temperature is 400° C. to 600° C., and the preset time is 10 min to 150 min.
3. The method according to claim 1, characterized in that The pressure of the air flow crusher used in air flow crushing and classification is 0.5Mpa~1Mpa.
4. The method according to claim 1, characterized in that: The step of subjecting the nano-scale tungsten trioxide powder to hydrogen reduction to obtain initial tungsten powder comprises: Placing the nanoscale tungsten trioxide powder in a designated reaction container for hydrogen reduction treatment to obtain the initial tungsten powder; Wherein, the designated reaction container has the function of guiding the flow direction of hydrogen gas.
5. The method according to claim 4, characterized in that The reduction temperature used in the hydrogen reduction treatment is 400°C to 850°C.
6. The method according to claim 1, characterized in that The dispersant is polyvinyl alcohol or polyethylene glycol.
7. The method according to claim 6, characterized in that The water-soluble carbon source is glucose or sucrose.
8. The method according to claim 1, characterized in that The carbonization temperature used in the carbonization treatment is 1200° C. to 1400° C., and the insulation time after reaching the carbonization temperature is 3 h to 6 h.
9. The method according to claim 8, characterized in that The hydrogen flow rate used in the carbonization treatment is 2L-10L, and the dew point of the hydrogen is less than -20°C.
10. A tungsten carbide powder, characterized in that: The tungsten carbide powder is prepared according to the method for preparing the tungsten carbide powder according to any one of claims 1 to 9.