Method for producing a wear-resistant, strength-coordinated cemented carbide product and use thereof

Abstract

The application provides a preparation method of wear-resistant and strength-coordinated hard alloy products, and the method comprises the following steps: (1) hard phase pretreatment: mixing tungsten carbide powder and yttrium stabilized zirconia precursor solution; (2) nanometer coating modification: placing the mixture in a planetary ball mill for ball milling to obtain yttrium stabilized zirconia coated tungsten carbide composite powder; (3) binder phase preparation; (4) mixing and pressing; (5) gradient sintering to obtain a sintered body; (6) placing the sintered body in a vacuum furnace for post-treatment, and thus the wear-resistant and strength-coordinated hard alloy products are obtained. Through multi-dimensional innovation of material ratio innovation, process optimization and equipment improvement, the technical problems of traditional hard alloy in hardness and toughness balance, high-temperature performance stability and production cost control are successfully solved, and an excellent and economically feasible hard alloy solution is provided for the field of high-end equipment manufacturing.

Description

Technical Field

[0001] This invention belongs to the field of alloy materials technology, specifically relating to a method for preparing a wear-resistant and strength-coordinated cemented carbide product and its application. Background Technology

[0002] Cemented carbide is a composite material made using powder metallurgy, with refractory metal carbides such as tungsten carbide and titanium carbide as the hard phase and metals such as cobalt and nickel as the binder phase. Its core characteristics include a room temperature hardness of HRA86-93, red hardness maintained up to 900-1000℃, and compressive strength exceeding 6000MPa. It is widely used in cutting tools, mining drill bits, molds, and wear-resistant parts. In machining, cemented carbide tools can achieve cutting speeds 4-7 times faster than high-speed steel and have a lifespan 5-80 times longer, making them particularly suitable for machining materials with hardness exceeding 50HRC, such as high-temperature alloys and hardened steel.

[0003] However, traditional cemented carbide faces three key contradictions in practical applications:

[0004] Firstly, there is the issue of balancing hardness and toughness. Increasing the tungsten carbide content can enhance hardness, but it leads to a decrease in the proportion of the binder phase, reducing the bending strength to 1000-3000 MPa, making the cutting tool prone to chipping under impact loads. For example, during rock drilling, stress concentration in mining drill bits causes edge breakage, shortening the average lifespan by 30%. Existing technologies improve toughness by adding tantalum carbide, niobium carbide, etc., to refine the grain size, or by adjusting the cobalt content to 6-15%. However, tantalum carbide is expensive, and a cobalt content exceeding 10% significantly reduces wear resistance.

[0005] Secondly, there is performance degradation under high-temperature conditions. When the temperature exceeds 600℃, the cobalt binder phase undergoes a lattice structure transformation, changing from a face-centered cubic structure to a hexagonal structure, leading to a decrease in hardness and accelerated oxidation. Existing solutions include using a cobalt-nickel-chromium ternary binder phase or surface coating technology, but ternary alloys have poor sintering activity and are prone to compositional segregation, while AlTiN coatings are prone to peeling due to a mismatch in thermal expansion coefficients with the substrate at high temperatures.

[0006] Third, uneven performance is caused by manufacturing process defects. In traditional sintering processes, excessively rapid heating rates can lead to abnormal growth of hard phase grains, forming coarse grains larger than 10 μm in some areas, while decarburization defects can generate brittle η phases. Existing technologies use a filler reheating method to repair decarburization, but this requires the entire structure to be embedded with alumina powder, which cannot selectively treat defective areas, and the powder is prone to contaminating the sintering furnace pipes.

[0007] To address the aforementioned issues, existing technologies have the following limitations: grain refinement additives such as vanadium carbide can inhibit grain growth, but they can also form low-melting-point eutectic phases, reducing the sintering temperature window; gradient sintering processes require precise control of multi-stage heating curves, increasing actual production energy consumption by 40%; and while ultrafine-grained cemented carbides can improve strength, their production cost is 2-3 times higher than that of conventional alloys, limiting their large-scale application.

[0008] Therefore, it is necessary to design a method for preparing cemented carbide products with wear resistance and strength coordination, and to explore their applications. Summary of the Invention

[0009] To overcome the shortcomings of existing technologies, a method for preparing wear-resistant and strength-coordinated cemented carbide products and their applications are provided.

[0010] To achieve the above objectives, the present invention provides the following technical solution:

[0011] A method for preparing a cemented carbide product with wear resistance and balanced strength, the method comprising the following steps:

[0012] (1) Hard phase pretreatment: Tungsten carbide powder is mixed with yttrium-stabilized zirconium oxide precursor solution;

[0013] (2) Nano-coating modification: The mixture obtained in step (1) is placed in a planetary ball mill for ball milling. The ball-milled material is calcined at 800-850℃ for 2-3 hours in a hydrogen atmosphere to obtain yttrium-stabilized zirconium oxide coated tungsten carbide composite powder.

[0014] (3) Preparation of binder phase: Cobalt powder, nickel powder and chromium powder are mixed to obtain mixed metal powder. 1-2% by mass of paraffin is added to the mixed metal powder as a forming agent. After ball milling for 8-10 hours, a uniform binder phase mixed powder is obtained.

[0015] (4) Mixing and pressing: The yttrium-stabilized zirconium oxide-coated tungsten carbide composite powder obtained in step (2) is mixed with the binder phase mixed powder obtained in step (3) at a mass ratio of 90-94:8, and pressed into shape under a pressure of 200-300MPa to obtain a compact;

[0016] (5) The pressed blank obtained in step (4) is subjected to gradient sintering to obtain a sintered body;

[0017] (6) Post-processing: Place the sintered body obtained in step (5) in a vacuum furnace and heat it to 1200-1250°C at 10-15°C / min. Introduce a mixture of argon and 5-8% volume hydrogen at a flow rate of 5-8 liters / min. Maintain the pressure inside the furnace at 0.5-1 MPa. After holding at the temperature for 0.5-1 hours, quench the mixture in oil to room temperature to obtain a wear-resistant and strength-coordinated cemented carbide product.

[0018] In (1), the tungsten carbide powder has a Fisher particle size of 3-5 micrometers, and the mass ratio of the tungsten carbide powder to the yttrium-stabilized zirconium oxide precursor solution is 100:1.5-3.

[0019] The preparation method of the yttrium-stabilized zirconium oxide precursor solution is as follows: yttrium nitrate hexahydrate and zirconium oxychloride octahydrate are dissolved in anhydrous ethanol at a molar ratio of yttrium to zirconium of 1:2-3, stirred until a transparent sol is formed, dried at 60-80℃, and then ground to 200-300 mesh.

[0020] In (2), the specific parameters of the ball milling are: adding tungsten carbide-cobalt cemented carbide grinding balls, and ball milling at 300-400 rpm for 4-6 hours under argon protection, with a ball-to-material mass ratio of 8-12:1.

[0021] The tungsten carbide-cobalt cemented carbide grinding ball has a diameter of 3-6 mm and a cobalt content of 6-8% by mass.

[0022] In (3), cobalt powder, nickel powder and chromium powder are mixed in a mass ratio of 65-75:15-20:8, wherein the purity of nickel powder is ≥99.8%, the purity of chromium powder is ≥99.5%, the particle size D50 of cobalt powder is 1.2-1.5 micrometers, the oxygen content of cobalt powder is ≤0.3% by mass, and the sulfur content of cobalt powder is ≤0.01% by mass.

[0023] In (5), the gradient sintering includes the following three stages:

[0024] First stage: Heat the compact to 1000-1050℃ at 8-10℃ / min, purge with nitrogen for protection, apply pressure of 5-8MPa, and hold for 1-1.5 hours;

[0025] Second stage: Increase the temperature to 1350-1380℃ at a rate of 5-6℃ / minute, pressurize to 18-22MPa, and hold for 2-2.5 hours;

[0026] The third stage: cool down to below 800°C at a rate of 2-3°C / minute to depressurize, with the oxygen content controlled below 50ppm throughout the process.

[0027] During the second stage of sintering, pulse pressure is applied with a pulse frequency of 0.5-1 Hz, a peak pressure of 25-30 MPa, and a valley pressure of 15-18 MPa.

[0028] During the third stage of cooling, a magnetic field of 0.5-1.5 Tesla is applied in the range of 600-800℃, with the direction of the magnetic field parallel to the direction of the sintering pressure.

[0029] The wear-resistant and strength-balanced cemented carbide products are used in heavy-duty cutting tools and mining drill bits.

[0030] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0031] 1. This invention, through multi-dimensional innovation in material proportioning, process optimization, and equipment improvement, successfully solves the technical challenges of traditional cemented carbide in terms of balancing hardness and toughness, high-temperature performance stability, and production cost control, providing a high-performance and economically feasible cemented carbide solution for the high-end equipment manufacturing field.

[0032] 2. This invention utilizes an innovative process of yttrium-stabilized zirconia nanocoating tungsten carbide, enabling the hard phase grain size to be controlled within the range of 0.4-0.6 micrometers, while the coating thickness is precisely controlled within 50-100 nanometers. This successfully resolves the contradiction between hardness and toughness in traditional materials. Due to the synergistic effect of the cobalt-nickel-chromium-yttrium quaternary binder system, the crystal transformation of cobalt at high temperatures is effectively suppressed. Under high-temperature conditions, the hardness retention rate of the product in this application can still reach over 85%.

[0033] 3. The process described in this application employs a composite process combining gradient sintering with pulsed pressure and magnetic field treatment, which solves the problems of abnormal grain growth and compositional segregation during traditional sintering. In the three-stage sintering process, the first stage eliminates the forming agent through slow heating, the second stage promotes densification using pulsed pressure, and the third stage optimizes the grain boundary structure with magnetic field treatment. This combined process results in a product density of 13.9-14.2 g / cm³. 3 Meanwhile, the uniformity of grain size distribution is controlled within 5%, which is a significant improvement compared to traditional processes.

[0034] 4. The introduction of pulse pressure in this application makes liquid phase sintering more complete and reduces porosity to below 0.1%, while magnetic field treatment effectively refines the cobalt phase distribution.

[0035] 5. This application uses relatively inexpensive yttrium-stabilized zirconium oxide instead of expensive tantalum carbide as a grain inhibitor, thus reducing material costs. Simultaneously, by precisely controlling the cobalt content within the range of 6-8%, both performance is ensured and the amount of rare metals used is reduced. Detailed Implementation

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] The sources of various raw materials in this application are briefly described as follows:

[0038] Tungsten carbide powder: High-purity tungsten carbide powder purchased from Zhuzhou Cemented Carbide Group or Xiamen Tungsten Industry.

[0039] Yttrium nitrate hexahydrate: purchased from Aladdin Reagent, CAS No. 20694-11-7.

[0040] Zirconium oxychloride octahydrate: purchased from Sinopharm Group, CAS No. 13520-92-8.

[0041] Anhydrous ethanol: analytical grade, concentration ≥99.7%, purchased from Shanghai Lingfeng Chemical Reagent.

[0042] Cobalt powder: Produced by Zhuhai Kelixin.

[0043] Nickel powder: Produced by Jinchuan Group.

[0044] Chromium powder: Produced by Hunan Jintian Titanium Industry.

[0045] Paraffin wax: Produced by Clariant in Germany, melting point 52-54℃, used as a molding agent.

[0046] A method for preparing a cemented carbide product with wear resistance and balanced strength, the method comprising the following steps:

[0047] (1) Hard phase pretreatment: Tungsten carbide powder is mixed with yttrium-stabilized zirconium oxide precursor solution;

[0048] (2) Nano-coating modification: The mixture obtained in step (1) is placed in a planetary ball mill for ball milling. The ball-milled material is calcined at 800-850℃ for 2-3 hours in a hydrogen atmosphere to obtain yttrium-stabilized zirconium oxide coated tungsten carbide composite powder.

[0049] (3) Preparation of binder phase: Cobalt powder, nickel powder and chromium powder are mixed to obtain mixed metal powder. 1-2% by mass of paraffin is added to the mixed metal powder as a forming agent. After ball milling for 8-10 hours, a uniform binder phase mixed powder is obtained.

[0050] (4) Mixing and pressing: The yttrium-stabilized zirconium oxide-coated tungsten carbide composite powder obtained in step (2) is mixed with the binder phase mixed powder obtained in step (3) at a mass ratio of 90-94:8, and pressed into shape under a pressure of 200-300MPa to obtain a compact;

[0051] (5) The pressed blank obtained in step (4) is subjected to gradient sintering to obtain a sintered body;

[0052] (6) Post-processing: Place the sintered body obtained in step (5) in a vacuum furnace and heat it to 1200-1250°C at 10-15°C / min. Introduce a mixture of argon and 5-8% volume hydrogen at a flow rate of 5-8 liters / min. Maintain the pressure inside the furnace at 0.5-1 MPa. After holding at the temperature for 0.5-1 hours, quench the mixture in oil to room temperature to obtain a wear-resistant and strength-coordinated cemented carbide product.

[0053] In (1), the tungsten carbide powder has a Fisher particle size of 3-5 micrometers, and the mass ratio of the tungsten carbide powder to the yttrium-stabilized zirconium oxide precursor solution is 100:1.5-3.

[0054] The preparation method of the yttrium-stabilized zirconium oxide precursor solution is as follows: yttrium nitrate hexahydrate and zirconium oxychloride octahydrate are dissolved in anhydrous ethanol at a molar ratio of yttrium to zirconium of 1:2-3, stirred until a transparent sol is formed, dried at 60-80℃, and then ground to 200-300 mesh.

[0055] In (2), the specific parameters of the ball milling are: adding tungsten carbide-cobalt cemented carbide grinding balls, and ball milling at 300-400 rpm for 4-6 hours under argon protection, with a ball-to-material mass ratio of 8-12:1.

[0056] The tungsten carbide-cobalt cemented carbide grinding ball has a diameter of 3-6 mm and a cobalt content of 6-8% by mass.

[0057] In (3), cobalt powder, nickel powder and chromium powder are mixed in a mass ratio of 65-75:15-20:8, wherein the purity of nickel powder is ≥99.8%, the purity of chromium powder is ≥99.5%, the particle size D50 of cobalt powder is 1.2-1.5 micrometers, the oxygen content of cobalt powder is ≤0.3% by mass, and the sulfur content of cobalt powder is ≤0.01% by mass.

[0058] In (5), the gradient sintering includes the following three stages:

[0059] First stage: Heat the compact to 1000-1050℃ at 8-10℃ / min, purge with nitrogen for protection, apply pressure of 5-8MPa, and hold for 1-1.5 hours;

[0060] Second stage: Increase the temperature to 1350-1380℃ at a rate of 5-6℃ / minute, pressurize to 18-22MPa, and hold for 2-2.5 hours;

[0061] The third stage: cool down to below 800°C at a rate of 2-3°C / minute to depressurize, with the oxygen content controlled below 50ppm throughout the process.

[0062] During the second stage of sintering, pulse pressure is applied with a pulse frequency of 0.5-1 Hz, a peak pressure of 25-30 MPa, and a valley pressure of 15-18 MPa.

[0063] During the third stage of cooling, a magnetic field of 0.5-1.5 Tesla is applied in the range of 600-800℃, with the direction of the magnetic field parallel to the direction of the sintering pressure.

[0064] The wear-resistant and strength-balanced cemented carbide products are used in heavy-duty cutting tools and mining drill bits.

[0065] The technical solutions of the present invention are further illustrated below through examples and comparative examples, but the scope of protection of the present invention is not limited thereto.

[0066] Example 1

[0067] In the hard phase pretreatment step, the tungsten carbide powder had a Fisher particle size of 5 micrometers and a mass ratio of tungsten carbide powder to yttrium-stabilized zirconium oxide precursor solution of 100:3. During precursor solution preparation, the molar ratio of yttrium to zirconium was 3, the drying temperature was 70℃, and the powder was ground to 200 mesh. In the nano-coating modification step, the ball milling speed was 400 rpm, the milling time was 5 hours, the ball-to-material mass ratio was 10:1, and the calcination temperature was 825℃. In binder phase preparation, the mass ratio of cobalt powder, nickel powder, and chromium powder was 75:17.5:8, and the paraffin wax addition was 1.5%. In the mixed pressing, the mass ratio of tungsten carbide composite powder to binder phase mixed powder was 94:8, and the pressing pressure was 250 MPa. The gradient sintering process involved a first-stage heating rate of 9℃ / min to 1050℃, a second-stage pulse pressure peak of 28 MPa, and a third-stage magnetic field strength of 1.0 T. The post-treatment process included a hydrogen content of 6.5% and a gas flow rate of 6.5 L / min.

[0068] Example 2

[0069] The hard phase pretreatment involved mixing tungsten carbide with a Fisher particle size of 3 microns with a precursor solution at a mass ratio of 100:1.5, a yttrium to zirconium molar ratio of 2, drying at 80℃, and grinding to 250 mesh. The nano-coating stage involved ball milling at 300 rpm for 6 hours with a ball-to-material mass ratio of 12:1 and calcination at 800℃. The binder phase had a mass ratio of 65:20:8 and contained 2% paraffin wax. The mixing and pressing pressure was 300 MPa, with a powder ratio of 90:8. Gradient sintering involved a first stage with a heating rate of 8℃ / min to 1000℃, a second stage with a peak pulse pressure of 30 MPa, and a third stage with a magnetic field strength of 0.5T. Post-treatment included 8% hydrogen content and a gas flow rate of 5 L / min.

[0070] Example 3

[0071] The hard phase pretreatment involved mixing tungsten carbide with a Fisher particle size of 4 microns with a precursor solution at a mass ratio of 100:2.25, a yttrium to zirconium molar ratio of 2.5, drying at 60℃, and grinding to 300 mesh. The nano-coating stage involved ball milling at 350 rpm for 4 hours, with a ball-to-material mass ratio of 8:1, and calcination at 850℃. The binder phase had a mass ratio of 70:15:8 and contained 1% paraffin wax. The mixing and pressing pressure was 200 MPa, with a powder ratio of 92:8. Gradient sintering involved a first stage with a heating rate of 10℃ / min to 1025℃, a second stage with a peak pulse pressure of 25 MPa, and a third stage with a magnetic field strength of 1.5T. Post-treatment included a hydrogen content of 5% and a gas flow rate of 8 L / min.

[0072] Comparative Example 1

[0073] The similarities with Example 1 will not be repeated here; the differences are as follows:

[0074] The yttrium-stabilized zirconium oxide coating step was omitted, and raw tungsten carbide powder was used directly. The grain size increased to 1.2 μm, and the hardness retention at 600℃ decreased to 72%.

[0075] Comparative Example 2

[0076] The similarities with Example 2 will not be repeated here; the differences are as follows:

[0077] A pure cobalt binder phase (12% cobalt content) was used. The flexural strength decreased to 3800 MPa, while the high-temperature oxidation rate increased by 80%.

[0078] Comparative Example 3

[0079] The similarities with Example 3 will not be repeated here; the differences are as follows:

[0080] Conventional isothermal sintering (1350℃ constant temperature) was used. The grain size distribution uniformity deviation increased to 15%, and the porosity increased to 1.2%.

[0081] Comparative Example 4

[0082] The similarities with Example 1 will not be repeated here; the differences are as follows:

[0083] Pulse pressure sintering was eliminated. Density decreased to 13.6 g / cm³. 3 Flexural strength 4200MPa.

[0084] Comparative Example 5

[0085] The similarities with Example 2 will not be repeated here; the differences are as follows:

[0086] Magnetic field treatment was omitted. The cobalt phase distribution uniformity deviation increased to 12%, and the impact toughness decreased by 25%.

[0087] Test Results and Analysis

[0088] The cemented carbide products obtained in the examples and comparative examples were subjected to performance tests to verify their effectiveness, as shown in Table 1.

[0089] Test results show that Examples 1-3 exhibit excellent balance between hardness and toughness. Through yttrium-stabilized zirconia nano-coating and quaternary binder phase design, the room temperature hardness of the example groups all exceeded HRA92.5, while the flexural strength remained at around 4500 MPa, representing an improvement of 12-40% compared to the comparative examples. Regarding high-temperature performance, the hardness retention rate of the example groups at 600℃ reached over 85%, far exceeding the 70% level of traditional alloys. This is attributed to the synergistic effect of the cobalt-nickel-chromium-yttrium system, which suppressed the crystal transformation of cobalt.

[0090] In the example group, WC grain size was stabilized within the range of 0.45-0.48 μm through gradient sintering combined with pulsed pressure and magnetic field treatment, with a grain size distribution uniformity deviation of ≤5%. In contrast, Comparative Example 3, using conventional isothermal sintering, showed a significant increase in grain inhomogeneity. The introduction of pulsed pressure reduced the porosity of the example group to below 0.1%, achieving a density of 13.9-14.2 g / cm³. 3 This confirms the effectiveness of the process in promoting the densification of liquid phase sintering.

[0091] Comparative Example 1 showed that the removal of yttrium-stabilized zirconium oxide coating led to abnormal grain growth to 1.2 μm, resulting in a simultaneous decrease in hardness and toughness. The pure cobalt binder phase (Comparative Example 2) improved toughness but sacrificed high-temperature stability. The omission of pulse pressure (Comparative Example 4) and magnetic field treatment (Comparative Example 5) resulted in a decrease in density and cobalt phase distribution uniformity, respectively, confirming the necessity of synergy in each step of the composite process.

[0092]

[0093] Table 1. Test results of cemented carbide properties

[0094] The cemented carbide products prepared by this invention, through optimization of material ratio and process parameters, significantly improve bending strength (≥4500MPa) and high-temperature stability (hardness retention rate ≥85% at 600℃) while maintaining high hardness (HRA≥92.5). The grain size is uniform and fine (0.45-0.48μm), and the overall performance is significantly better than the comparative products prepared by traditional processes.

[0095] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles 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 of producing a wear resistant, strength balanced cemented carbide product, characterized in that, The method comprises the following steps: (1) Hard phase pretreatment: mix tungsten carbide powder with yttrium stabilized zirconia precursor solution; (2) Nano-coating modification: place the mixture obtained in step (1) in a planetary ball mill for ball milling, and then calcine the ball-milled material in a hydrogen atmosphere at 800-850°C for 2-3 hours to obtain yttrium stabilized zirconia-coated tungsten carbide composite powder; (3) Binder phase preparation: mix cobalt powder, nickel powder and chromium powder to obtain mixed metal powder, add 1-2% of paraffin by mass to the mixed metal powder as a forming agent, and ball mill for 8-10 hours to obtain a uniform binder phase mixed powder; (4) Mixing and pressing: mix the yttrium stabilized zirconia-coated tungsten carbide composite powder obtained in step (2) with the binder phase mixed powder obtained in step (3) at a mass ratio of 90-94:8, and press form under a pressure of 200-300 MPa to obtain a green compact; (5) Gradient sintering of the green compact obtained in step (4) to obtain a sintered body; (6) Post-treatment: place the sintered body obtained in step (5) in a vacuum furnace, heat it to 1200-1250°C at a rate of 10-15°C / min, introduce a mixed gas of argon and 5-8% hydrogen by volume, with a gas flow rate of 5-8 L / min, maintain the pressure in the furnace at 0.5-1 MPa, and after 0.5-1 hours of heat preservation, oil quench to room temperature to obtain a wear-resistant, strength-coordinated hard alloy product; In (5), the gradient sintering comprises the following three stages: First stage: heat the green compact to 1000-1050°C at a rate of 8-10°C / min, introduce nitrogen protection, apply a pressure of 5-8 MPa, and heat for 1-1.5 hours; Second stage: heat to 1350-1380°C at a rate of 5-6°C / min, apply a pressure of 18-22 MPa, and heat for 2-2.5 hours; Third stage: cool to below 800°C at a rate of 2-3°C / min, release the pressure, and control the oxygen content to be below 50 ppm throughout the process; pulse pressure is applied during the second stage sintering, with a pulse frequency of 0.5-1 Hz, a peak pressure of 25-30 MPa, and a valley pressure of 15-18 MPa; a magnetic field of 0.5-1.5 Tesla is applied in the 600-800°C interval during the third stage cooling, with the magnetic field direction parallel to the sintering pressure direction.

2. A method of making a wear resistant, strength consistent cemented carbide product according to claim 1, characterized in that: In (1), the tungsten carbide powder has a Fisher particle size of 3-5 microns, and the mass ratio of the tungsten carbide powder to the yttrium stabilized zirconia precursor solution is 100:1.5-3.

3. A method of making a wear resistant, strength consistent cemented carbide product according to claim 2, characterized in that: The preparation method of the yttrium stabilized zirconia precursor solution is as follows: dissolve yttrium nitrate hexahydrate and zirconium oxychloride octahydrate in anhydrous ethanol at a molar ratio of yttrium to zirconium of 1:2-3, stir until a transparent sol is formed, dry at 60-80°C, and then grind to 200-300 mesh.

4. A method of making a wear resistant, strength consistent cemented carbide product according to claim 1, characterized in that: In (2), the specific parameters of the ball milling are as follows: tungsten carbide-cobalt hard alloy balls are added, ball milling is carried out under argon protection at 300-400 rpm for 4-6 hours, and the ball-to-material mass ratio is 8-12:

1.

5. A method of making a wear resistant, strength consistent cemented carbide product according to claim 4, characterized in that: The diameter of the tungsten carbide-cobalt hard alloy balls is 3-6 mm, and the cobalt content is 6-8% by mass.

6. A method of making a wear resistant, strength consistent cemented carbide product according to claim 1, characterized in that: In (3), the cobalt powder, the nickel powder and the chromium powder are mixed in a mass ratio of 65-75:15-20:8, wherein the purity of the nickel powder is ≥99.8%, the purity of the chromium powder is ≥99.5%, the particle size D50 of the cobalt powder is 1.2-1.5 microns, the oxygen content of the cobalt powder is ≤0.3% by mass, and the sulfur content of the cobalt powder is ≤0.01% by mass.

7. Use of a wear resistant, strength balanced cemented carbide product according to any one of claims 1-6, characterized in that: The wear-resistant, strength-coordinated hard metal product is used for heavy cutting tools and mine drill bits.

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