A cemented carbide and a method for producing and using the same

Abstract

The application discloses a cemented carbide and a preparation method and application thereof. The cemented carbide comprises a hard phase and a binder phase. The hard phase is (W, Re)C. Components of the binder phase comprise one or both of Ru and Os, Co and Re. The mass of Re dissolved in the hard phase accounts for 50% to 90% of the total mass of Re in the cemented carbide. The atomic percentage of total Re / Co in the cemented carbide is not more than 25%. The preparation method comprises the following steps: preparing a mixture by using M alloy powder, tungsten-rhenium alloy powder, WC powder and carbon powder as raw materials, pre-milling, ball milling, drying, granulating, forming and sintering. The cemented carbide is obtained. The cemented carbide has high hardness, high toughness and good high-temperature performance, and has excellent comprehensive mechanical properties, and can be well applied to the preparation of cemented carbide cutters.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of powder metallurgy, and particularly relates to a cemented carbide and a preparation method and application thereof. BACKGROUND

[0002] In the cutting process, the common failure modes of cemented carbide tools are wear and chipping, and the failure reasons are low hardness and low strength of the tool material. In the conventional cemented carbide material system, the hardness of the alloy must be improved at the cost of sacrificing the strength of the alloy, and vice versa. Therefore, how to simultaneously improve the hardness and strength of the material has been the research focus of material researchers and an urgent existing problem to be solved. Patent documents CN1088116C and CN104404337A improve the mechanical properties of cemented carbide by adding Ru elements, and patent document CN111321334B improves the wear resistance and high-temperature performance of cemented carbide by adding Re elements. However, with the rapid development of science and technology, new material technology is changing our world, and new materials have been widely used in aerospace, new energy, biomedicine and other fields. These new materials have surpassed traditional materials in performance, such as high strength, light weight, oxidation resistance, etc. However, the machinability of metal parts of new materials is getting lower and lower, and the requirements for cemented carbide tools are getting higher and higher. Therefore, it is urgent to develop cemented carbide with better comprehensive performance. SUMMARY

[0003] The technical problem to be solved by the application is to overcome the shortcomings of the prior art and provide a cemented carbide with high hardness, high toughness and good high-temperature performance, a preparation method and application thereof, and a preparation process which is stable and convenient for industrial production.

[0004] To solve the above technical problems, the application adopts the following technical solutions.

[0005] A cemented carbide comprises a hard phase and a binder phase, the hard phase is (W, Re)C, the components of the binder phase comprise one or both of Ru and Os, Co and Re, the mass of Re dissolved in the hard phase accounts for 50% to 90% of the total Re mass in the cemented carbide, and the atomic percentage of total Re / Co in the cemented carbide is not greater than 25%.

[0006] Preferably, the atomic percentage of total Re / W in the cemented carbide is not less than 1.3%.

[0007] Preferably, 3%≤ the atomic percentage of total Re / Co ≤15%, and 1.3%≤ the atomic percentage of total Re / W ≤7.2%.

[0008] As a general technical concept, the present application also provides a method for preparing the cemented carbide as described above, comprising the following steps:

[0009] (1) batching: taking M alloy powder, tungsten-rhenium alloy powder, WC powder and carbon powder as raw materials, the M alloy powder being one or both of cobalt-ruthenium alloy powder and cobalt-osmium alloy powder, and taking the total amount of the raw materials as 100%, by mass fraction, when the M alloy powder is cobalt-ruthenium alloy powder, the cobalt-ruthenium alloy powder is 5.5%-18.0%, when the M alloy powder is cobalt-osmium alloy powder, the cobalt-osmium alloy powder is 5.8%-19.7%, when the M alloy powder is both cobalt-ruthenium alloy powder and cobalt-osmium alloy powder, the sum of the cobalt-ruthenium alloy powder and the cobalt-osmium alloy powder is 5.6%-19.5%, the tungsten-rhenium alloy powder is 4.0%-23.0%, the addition amount of the tungsten-rhenium alloy powder shall comply with the principle of making the atomic percentage of total Re / Co in the cemented carbide not more than 25%, and the addition amount of the carbon powder is m C =(0.0653m W +0.0496m Re )×x, x=0.85-1.00, m C is the mass of the carbon powder, m W , m Re are the masses of tungsten and rhenium in the tungsten-rhenium alloy powder, and the WC powder is the balance;

[0010] (2) pre-milling the raw materials, then ball milling, drying, granulating, molding and sintering the obtained mixture to obtain the cemented carbide.

[0011] Preferably in the method for preparing the cemented carbide as described above, in step (1), the atomic percentage of Ru in the cobalt-ruthenium alloy powder is 5%-30%, the atomic percentage of Os in the cobalt-osmium alloy powder is 3%-20%, and 20%≤ the mass fraction of Re in the tungsten-rhenium alloy powder≤26%.

[0012] Preferably in the method for preparing the cemented carbide as described above, in step (2), the specific process of the pre-milling and the ball milling is as follows: mixing the raw materials except the WC powder, pre-milling until the Fsss particle size of the powder≤1μm, and then adding the WC powder for ball milling.

[0013] Preferably in the method for preparing the cemented carbide as described above, in step (2), the time of the pre-milling is 5h-30h, and the time of the ball milling is 20h-50h.

[0014] The preparation method of the cemented carbide, preferably, in the step (1), the purity of the cobalt-ruthenium alloy powder is not less than 99.90%, and the Fsss particle size of the cobalt-ruthenium alloy powder is not more than 5 microns; the purity of the cobalt-osmium alloy powder is not less than 99.90%, and the Fsss particle size of the cobalt-osmium alloy powder is not more than 5 microns; the purity of the tungsten-molybdenum alloy powder is not less than 99.90%, and the Fsss particle size of the tungsten-molybdenum alloy powder is not more than 10 microns.

[0015] The preparation method of the cemented carbide, preferably, in the step (1), the Fsss particle size of the WC powder is 0.5 microns to 5.0 microns.

[0016] The preparation method of the cemented carbide, preferably, in the step (1), the raw material further comprises nitride powder or carbide powder of one or more of Ta, Nb and Ti.

[0017] The preparation method of the cemented carbide, preferably, in the step (1), the raw material further comprises an inhibitor, and the inhibitor comprises Cr3C2 powder and / or VC powder, wherein the content of Cr satisfies a mass ratio of Cr / Co of 0 to 10.0%, and the content of V satisfies a mass ratio of V / Co of 0 to 4.0%.

[0018] The preparation method of the cemented carbide, preferably, in the step (2), the forming agent used in the forming is a mixture of PEG4000 and PEG1500 or PEG4000, and the mass of the forming agent is 2% to 3% of the mass of the mixture, and when the forming agent is the mixture of PEG4000 and PEG1500, the mass of the PEG1500 is 0.5% of the mass of the mixture.

[0019] The sintering is vacuum sintering or high-pressure sintering, the temperature of the sintering is 1400°C to 1550°C, when the sintering is high-pressure sintering, the protective atmosphere used is argon atmosphere, and the pressure of the high-pressure sintering is 40 bar to 80 bar.

[0020] As a general technical concept, the application further provides application of the cemented carbide or the cemented carbide prepared by the preparation method in the preparation of a cemented carbide tool.

[0021] In the application, the mass fraction of impurities in the raw material of the cemented carbide is less than 0.01%.

[0022] In the application, the cemented carbide has high hardness, high toughness and good high-temperature performance, and can be applied to a cemented carbide tool, and can be applied to continuous and intermittent cutting machining of difficult-to-machine materials and stainless steel materials.

[0023] Compared with the prior art, the application has the following advantages:

[0024] 1. According to the applicant's research, Ru and Os have a solid solution strengthening effect on the cobalt phase, which can improve the impact toughness of the cemented carbide. Re has a solid solution strengthening effect on WC, which can improve the wear resistance and high temperature performance of the cemented carbide. The present invention adopts the composite addition of Ru / Os and Re, which can have a solid solution strengthening effect on the binder phase and hard phase WC of the cemented carbide, synergistically strengthen the cemented carbide structure, and can simultaneously improve the hardness, toughness, fatigue performance and high temperature performance of the cemented carbide.

[0025] To address the uneven distribution of Ru, Os, and Re in cemented carbide, the present invention utilizes cobalt-ruthenium alloy powder and / or cobalt-osmium alloy powder, as well as tungsten-rhenium alloy powder, combined with a pre-ball milling process. This allows Ru and / or Os to be uniformly dissolved in the binder phase, Co, while more Re is dissolved in the hard phase, WC, resulting in a cemented carbide with a uniform microstructure. Furthermore, the dissolution of Ru and / or Os in the binder phase, Co, reduces the rhenium content in the cobalt phase, allowing more Re to dissolve in WC, further enhancing the solid solution strengthening effect of Re on the hard phase, WC.

[0026] The present invention adds composite alloy powder to cemented carbide and limits the amount of alloy powder added and the ratio of Ru and / or Os to Re in the alloy, so that the cemented carbide has good comprehensive mechanical properties, is suitable for cemented carbide cutting tools, and can meet various working conditions such as continuous and intermittent cutting of difficult-to-machine materials and stainless steel materials.

[0027] 2. In actual production applications, the cemented carbide of the present invention can be produced and prepared according to a powder metallurgy method, and the preparation process is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is the transmission electron microscope element distribution diagram of the cemented carbide of Comparative Example 1.

[0029] Figure 2 This is the transmission electron microscope element distribution diagram of the cemented carbide of Comparative Example 2.

[0030] Figure 3 This is the transmission electron microscope element distribution diagram of the cemented carbide of Comparative Example 3.

[0031] Figure 4 TEM element distribution diagram of the cemented carbide of Example 1 of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but the scope of protection of the present invention is not limited thereby. The materials and instruments used in the following examples are all commercially available.

[0033] Example 1

[0034] A cemented carbide of the present application, comprising a hard phase and a binder phase, the hard phase being (W, Re)C, the component of the binder phase comprising Ru, Co and Re, the mass of Re in solid solution in the hard phase accounting for 61% of the total Re mass in the cemented carbide, the total Re / Co atomic percentage in the cemented carbide being 4.74 at.%, and the total Re / W atomic percentage being 1.84 at.%.

[0035] A method for preparing a cemented carbide of the present application, comprising the following steps:

[0036] (1) batching: taking M alloy powder, tungsten-rhenium alloy powder, WC powder and carbon powder as raw materials, the M alloy powder being cobalt-ruthenium alloy powder, taking the total amount of the raw materials as 100%, in mass fraction, the cobalt-ruthenium alloy powder being 12.50 wt.%, the tungsten-rhenium alloy powder being 6.10 wt.%, and the addition amount of the carbon powder being m C = (0.0653m W + 0.0496m Re ) x x, x = 0.92, m C being the mass of the carbon powder, m W , m Re being the mass of tungsten and rhenium in the tungsten-rhenium alloy powder respectively, the mass fraction of the carbon powder corresponding to the mass of the carbon powder being 0.62 wt.%, and the WC powder being the balance (80.78 wt.%);

[0037] In this embodiment, the atomic percentage of Ru in the cobalt-ruthenium alloy powder is 12.7%, the purity of the cobalt-ruthenium alloy powder is 99.94%, and the Fsss particle size is 2.0 μm.

[0038] In this embodiment, the mass fraction of Re in the tungsten-rhenium alloy powder is 24.6%, the purity of the tungsten-rhenium alloy powder is 99.92%, and the Fsss particle size is 3.5 μm.

[0039] In this embodiment, the Fsss particle size of the WC powder is 3.2 μm.

[0040] (2) adding ball milling rods in a wet mill, adding the cobalt-ruthenium alloy powder, the tungsten-rhenium alloy powder, the carbon powder, a forming agent and anhydrous alcohol, pre-ball milling for 15 h until the Fsss particle size of the powder is 0.9 μm, then adding the WC powder, and continuing wet milling for 25 h to obtain a mixture, wherein the ball-to-material ratio (mass ratio of the ball milling rods to all raw materials) is 10:1, and the mixture is subjected to spray drying and granulation, and is pressed into a shape, the forming agent being PEG4000, and the mass of the forming agent being 2.0% of the mass of the mixture, high-pressure sintering at 1450℃ in an argon atmosphere for 30 min, the pressure of the argon atmosphere being 60 bar, and after sintering, a cemented carbide is obtained.

[0041] Comparative Example 1

[0042] A cemented carbide, raw material components and mass fractions are as follows: WC powder 90.00wt.%, Fsss particle size 3.2 μm, cobalt powder 10.00wt.%, Fsss particle size 1.0 μm. The preparation process is the same as that of example 1.

[0043] Comparative example 2

[0044] A cemented carbide, raw material components and mass fractions are as follows: WC powder 88.38wt.%, Fsss particle size 3.2 μm, cobalt powder 10.00wt.%, Fsss particle size 1.0 μm, Re powder 1.55wt.%, Fsss particle size 1.5 μm, carbon powder 0.07%. The preparation process is the same as that of example 1. The total Re / W atomic ratio of comparative example 2 and example 1 is 1.84 at.%.

[0045] Comparative example 3

[0046] A cemented carbide, raw material components and mass fractions are as follows: WC powder 87.50wt.%, Fsss particle size 3.2 μm, cobalt powder 10.00wt.%, Fsss particle size 1.0 μm, Ru powder 2.50wt.%, Fsss particle size 2.0 μm. The preparation process is the same as that of example 1. The Ru / Co atomic percentage of comparative example 3 and example 1 is 12.7 at.%.

[0047] Table 1 mechanical properties of cemented carbide of example 1 and comparative examples 1-3

[0048] Mechanical properties Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Hardness (Hv3) 1390 1280 1370 1320 Bending strength TRS (N / mm 2 )]]> 3264 2440 2380 3150 High temperature hardness (Hv10, 800°C) 1020 780 950 920 Fatigue properties (bending resistance, million times) 44 15 19 24 Fatigue properties (average bending force, kN) 26 20 22 22

[0049] As can be seen from table 1, compared with comparative example 1, comparative example 2 and comparative example 3, the cemented carbide of example 1 has higher hardness, bending strength, high temperature hardness and fatigue performance, and it can be seen that the cemented carbide of the application has very high comprehensive mechanical properties.

[0050] The transmission electron microscope element distribution of the cemented carbide of comparative example 1 is shown in Figure 1 , and the main elements of the hard phase are W and C, and the main elements of the binder phase are Co.

[0051] The transmission electron microscope element distribution of the cemented carbide of comparative example 2 is shown in Figure 2 , and the metal Re is solid-solved in the hard phase WC.

[0052] The transmission electron microscope element distribution of the cemented carbide of comparative example 3 is shown in Figure 3 , and the metal Ru is solid-solved in the binder phase Co.

[0053] The transmission electron microscope element distribution of the cemented carbide of example 1 is shown in Figure 4 , and the metal Ru is solid-solved in the binder phase Co, and the metal Re is mainly solid-solved in the hard phase WC.

[0054] RCKT1204M0-NM type milling inserts are prepared from the hard alloy of Example 1 and Comparative Example 1, Comparative Example 2, Comparative Example 3, and a stainless steel 1Cr18Ni9Ti milling comparison test is conducted, and the cutting parameters are shown in Table 2.

[0055] Table 2 Milling comparison test parameter table

[0056] Speed Feed Depth of cut Width of cut Cooling method 240 m / min 0.15 mm / r 3.0 mm 30 mm Coolant

[0057] As can be seen from Table 3, compared with the tool of the hard alloy of Comparative Example 1, Comparative Example 2 and Comparative Example 3, the hard alloy tool produced by Example 1 of the application shows better cutting life.

[0058] Table 3 Milling comparison test result table

[0059] 1st edge 2nd edge 3rd edge 4th edge Example 1 130 min 138 min 126 min 131 min Comparative Example 1 65 min 48 min 58 min 60 min Comparative Example 2 82 min 110 min 90 min 75 min Comparative Example 3 94 min 95 min 104 min 99 min

[0060] Example 2

[0061] A hard alloy of the application comprises a hard phase and a binder phase, the hard phase is (W, Re)C, the components of the binder phase include Os, Co and Re, the mass of Re solid-solved in the hard phase accounts for 66% of the total Re mass in the hard alloy, the atomic percentage of total Re / Co in the hard alloy is 6.33 at.%, the atomic percentage of total Re / W is 1.64 at.%, and the mass ratio of Cr / Co is 0.2 wt.%.

[0062] A preparation method of the hard alloy of the application comprises the following steps:

[0063] (1) batching: taking M alloy powder, cobalt-osmium alloy powder, WC powder, carbon powder, TaNbC powder and Cr3C2 powder as raw materials, the M alloy powder is cobalt-osmium alloy powder, taking the total amount of raw materials as 100%, in mass fraction, the cobalt-osmium alloy powder is 8.37 wt.%, the tungsten-rhenium alloy powder is 5.65 wt.%, the addition amount m C of the carbon powder is (0.0653m W + 0.0496m Re ) x x, x = 0.90, m C is the mass of the carbon powder, m W , m Re are the masses of tungsten and rhenium in the tungsten-rhenium alloy powder, the mass fraction of the carbon powder corresponding to the mass of the carbon powder is 0.60 wt.%, the TaNbC powder is 0.76 wt.%, the Cr3C2 powder is 0.16 wt.%, and the WC powder is the balance (84.46 wt.%).

[0064] In this embodiment, the atomic percentage of Os in the cobalt-osmium alloy powder is 6.0%, the purity of the cobalt-osmium alloy powder is 99.90%, and the Fsss particle size is 3.0 μm.

[0065] In this embodiment, the mass fraction of Re in the tungsten-rhenium alloy powder is 24.6%, the purity of the tungsten-rhenium alloy powder is 99.92%, and the Fsss particle size is 3.5 μm.

[0066] In this embodiment, the Fsss particle size of the WC powder is 0.68 μm, the Fsss particle size of the TaNbC powder is 2.1 μm, and the Fsss particle size of the Cr3C2 powder is 1.2 μm.

[0067] (2) The ball milling rods are added into the wet mill, the cobalt-osmium alloy powder, the tungsten-rhenium alloy powder, the carbon powder, the TaNbC powder, the Cr3C2 powder, the forming agent and the anhydrous alcohol are added, and pre-milling is performed for 15 h until the Fsss particle size of the powder is 0.8 μm, then the WC powder is added, and wet milling is continued for 40 h to obtain a mixture, wherein the ball-to-material ratio is 10:1; the mixture is spray dried and granulated, and is pressed into a shape, the forming agent is PEG4000 and PEG1500, and the mass of the two is 2.0% and 0.5% of the mass of the mixture respectively, high pressure sintering is performed at 1420 °C for 30 min in an argon atmosphere, the pressure of the argon atmosphere is 60 bar, and after sintering, a cemented carbide is obtained.

[0068] Comparative Example 4

[0069] A cemented carbide, the raw material components and mass fractions are as follows: the WC powder is 92.08 wt.% with a Fsss particle size of 0.68 μm, the TaNbC powder is 0.76 wt.%, the cobalt powder is 7.00 wt.% with a Fsss particle size of 1.0 μm, and the Cr3C2 powder is 0.16 wt.% with a Fsss particle size of 1.2 μm. The preparation process is the same as that of Example 2.

[0070] Comparative Example 5

[0071] A cemented carbide, the raw material components and mass fractions are as follows: the WC powder is 90.57 wt.% with a Fsss particle size of 0.68 μm, the TaNbC powder is 0.76 wt.%, the cobalt powder is 7.00 wt.% with a Fsss particle size of 1.0 μm, the Re powder is 1.41 wt.% with a Fsss particle size of 1.5 μm, the Cr3C2 powder is 0.16 wt.% with a Fsss particle size of 1.2 μm, and the carbon powder is added in an amount of 0.10 wt.%. The preparation process is the same as that of Example 2. The total atomic percentage of Re / W in Comparative Example 5 and Example 2 is 1.64 at.%.

[0072] Comparative Example 6

[0073] A cemented carbide, raw material components and mass fractions thereof are as follows: WC powder 90.62 wt.%, Fsss particle size 0.68 μm, TaNbC powder 0.76 wt.%, cobalt powder 7.00 wt.%, Fsss particle size 1.0 μm, Os powder 1.42 wt.%, Fsss particle size 3.0 μm, Cr3C2 powder 0.16 wt.%, Fsss particle size 1.2 μm, and carbon powder 0.04 wt.%, and the preparation process is the same as that of Example 2. The atomic percentage of Os / Co in Comparative Example 6 and Example 2 is 6 at.%.

[0074] Table 4: Mechanical properties of cemented carbide of Example 2 and Comparative Examples 4-6

[0075] Mechanical properties Example 2 Comparative Example 4 Comparative Example 5 Comparative Example 6 Hardness (Hv3) 1760 1650 1720 1700 Bending strength TRS (N / mm 2 )]]> 2844 2247 2150 2752 High temperature hardness (Hv10, 800°C) 1390 980 1230 1150 Fatigue properties (bending resistance, million times) 22 14 16 17 Fatigue properties (average bending force, kN) 18 12 15 14

[0076] As shown in Table 4, compared with Comparative Examples 4, 5 and 6, the cemented carbide of Example 2 has higher hardness, strength, high-temperature hardness and fatigue performance, which indicates that the cemented carbide of Example 2 has better comprehensive mechanical properties.

[0077] The cemented carbide prepared in this example is applied to prepare a cemented carbide turning tool. SNMG120412-SNR type turning inserts are prepared by using the cemented carbide of Example 2 and Comparative Examples 4, 5 and 6, and a nickel-based high-temperature alloy GH4169 turning comparison test is performed, and the cutting parameters are shown in Table 5.

[0078] Table 5: Parameter table of turning comparison test

[0079] Speed Feed Depth of cut Cooling method 45 m / min 0.15 mm / r 1.5 mm Coolant

[0080] In the cutting test, the tool failure criterion is that the tool relief surface wear reaches 0.3 μm or the blade edge collapses. As shown in Table 6, compared with the cemented carbide tools of Comparative Examples 4, 5 and 6, the cemented carbide tool produced by Example 2 has better cutting life.

[0081] Table 6: Test result table of turning comparison test

[0082] Time Wear value Example 2 45 min 0.29 μm Comparative Example 4 28 min 0.35 μm Comparative Example 5 36 min Chipping Comparative Example 6 35 min 0.32 μm

[0083] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art, without departing from the spirit and technical solutions of the present application, can make many possible changes and modifications to the technical solutions of the present application, or modify equivalent embodiments with equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solutions of the present application, still belongs to the protection scope of the technical solutions of the present application.

Claims

1. A cemented carbide, characterized in that: The hard alloy comprises a hard phase and a binder phase, the hard phase is (W, Re)C, components of the binder phase include one or both of Ru and Os, Co and Re, the mass of Re dissolved in the hard phase accounts for 50% to 90% of the total Re mass in the hard alloy, the atomic percentage of total Re / Co in the hard alloy is not more than 25%. The atomic percentage of total Re / W in the hard alloy is not less than 1.3%.

2. The cemented carbide according to claim 1, characterized in that, 3%≤ the atomic percentage of total Re / Co ≤15%, 1.3%≤ the atomic percentage of total Re / W ≤7.2%.

3. A method of producing cemented carbide as claimed in claim 1 or 2, c h a r a c t e r i s e d in that The method comprises the following steps: (1)Batching: taking M alloy powder, tungsten-rhenium alloy powder, WC powder and carbon powder as raw materials, the M alloy powder is one or both of cobalt-ruthenium alloy powder and cobalt-osmium alloy powder, taking the total amount of raw materials as 100%, by mass fraction, when the M alloy powder is cobalt-ruthenium alloy powder, the cobalt-ruthenium alloy powder is 5.5%-18.0%, when the M alloy powder is cobalt-osmium alloy powder, the cobalt-osmium alloy powder is 5.8%-19.7%, when the M alloy powder is cobalt-ruthenium alloy powder and cobalt-osmium alloy powder, the sum of the cobalt-ruthenium alloy powder and the cobalt-osmium alloy powder is 5.6%-19.5%, the tungsten-rhenium alloy powder is 4.0%-23.0%, the addition amount of the tungsten-rhenium alloy powder shall comply with the principle that the atomic percentage of total Re / Co in the hard alloy is not greater than 25%, the addition amount m C of the carbon powder is (0.0653m W +0.0496m Re )×x, x=0.85-1.00, m C is the mass of the carbon powder, m W and m Re are the masses of tungsten and rhenium in the tungsten-rhenium alloy powder respectively, and the WC powder is the balance; (2) Pre-milling and then ball-milling the raw materials, and then drying, granulating, molding and sintering the obtained mixture to obtain the hard alloy.

4. A method of producing cemented carbide according to claim 3, c h a r a c t e r i s e d in that In step (1), the atomic percentage of Ru in the cobalt-ruthenium alloy powder is 5% to 30%, the atomic percentage of Os in the cobalt-osmium alloy powder is 3% to 20%, and the mass fraction of Re in the tungsten-rhenium alloy powder is 20% to 26%.

5. A method of producing cemented carbide according to claim 3, c h a r a c t e r i s e d in that In step (2), the specific process of pre-milling and ball-milling is as follows: mixing the raw materials except the WC powder, pre-milling until the Fsss particle size of the powder is ≤1 μm, and then adding the WC powder for ball-milling.

6. A method of producing cemented carbide according to claim 5, c h a r a c t e r i s e d in that In step (2), the pre-milling time is 5h to 30h, and the ball-milling time is 20h to 50h.

7. A method of producing cemented carbide according to any one of claims 3-6, c h a r a c t e r i s e d in that In step (1), the purity of the cobalt-ruthenium alloy powder is not less than 99.90%, and the Fsss particle size of the cobalt-ruthenium alloy powder is ≤5 μm; the purity of the cobalt-osmium alloy powder is not less than 99.90%, and the Fsss particle size of the cobalt-osmium alloy powder is ≤5 μm; the purity of the tungsten-rhenium alloy powder is not less than 99.90%, and the Fsss particle size of the tungsten-rhenium alloy powder is ≤10 μm.

8. A method of producing cemented carbide according to any one of claims 3-6, c h a r a c t e r i s e d in that In step (1), the Fsss particle size of the WC powder is 0.5 μm to 5.0 μm.

9. A method of producing cemented carbide according to any one of claims 3-6, c h a r a c t e r i s e d in that In step (1), the raw materials further comprise nitride powder or carbide powder of one or more of Ta, Nb and Ti.

10. A method of producing cemented carbide according to any one of claims 3-6, characterised in that, In step (1), the raw materials further comprise an inhibitor, and the inhibitor comprises Cr3C2 powder and / or VC powder, wherein the Cr content satisfies a Cr / Co mass ratio of 0 to 10.0%, and the V content satisfies a V / Co mass ratio of 0 to 4.0%.

11. A method of producing cemented carbide according to any one of claims 3-6, characterised in that, In step (2), the molding agent used for molding is a mixture of PEG4000 and PEG1500 or PEG4000, the mass of the molding agent is 2% to 3% of the mass of the mixture, and when the molding agent is a mixture of PEG4000 and PEG1500, the mass of the PEG1500 is 0.5% of the mass of the mixture. The sintering is vacuum sintering or high-pressure sintering, the sintering temperature is 1400°C to 1550°C, when the sintering is high-pressure sintering, the protective atmosphere used is argon atmosphere, and the pressure of the high-pressure sintering is 40bar to 80bar.

12. Use of the hard alloy of claim 1 or 2 or the hard alloy prepared by the method of any one of claims 3 to 11 in the preparation of a hard alloy cutter.

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