A short-process and efficient method for preparing plate-shaped WC-Co cemented carbide

Abstract

The present invention discloses a method for efficiently preparing plate-shaped WC-Co cemented carbide in a short process. The method uses WC, Co and an organic forming agent as raw materials, utilizes discharge plasma to assist ball milling of WC-Co mixed powder, and then presses the WC-Co composite powder into a green compact, which is then placed in a low-pressure sintering furnace to prepare plate-shaped WC-Co cemented carbide. The present invention uses discharge plasma to assist ball milling, which reduces the ball milling time and greatly improves the powder activity, promoting the formation of plate-shaped WC. At the same time, this method breaks through the bottleneck of industrial application of dry powder preparation of WC-Co cemented carbide, achieving a combination of high strength and high toughness of the alloy.

Description

Technical Field

[0001] The invention belongs to the technical field of cemented carbide preparation, and in particular relates to a method for efficiently preparing plate-shaped WC-Co cemented carbide with a short process. Background Art

[0002] WC-Co cemented carbide has the characteristics of high hardness, wear resistance and high transverse fracture strength, and is widely used in cutting, molds, wear-resistant parts and mining tools. The rapid development of industry has also placed increasingly higher demands on the comprehensive mechanical properties of cemented carbide. To this end, studies have found that plate-shaped WC-Co cemented carbide can effectively overcome the contradiction between hardness and strength, brittleness and processing softening in traditional cemented carbide, and has high hardness, high strength, high wear resistance and high toughness. However, plate-shaped WC-Co cemented carbide has disadvantages such as complex preparation process and low proportion of prepared plate-shaped WC grains. Therefore, a method for efficiently preparing plate-shaped WC-Co cemented carbide with a high proportion is needed.

[0003] Conventional cemented carbide is a brittle material, with a trade-off between hardness and toughness. From the perspective of WC hard phase morphology, introducing plate-shaped WC grains into cemented carbide can simultaneously improve both hardness and toughness, achieving "double-high" mechanical properties. Currently, there are three main methods for preparing plate-structured WC-Co cemented carbide: one uses flaky W powder, graphite, and Co powder as raw materials to produce plate-shaped cemented carbide. Chinese patent application CN109652717A utilizes this method to produce plate-shaped cemented carbide, but the process is time-consuming, involves multiple steps, and is prone to raw material contamination, making it difficult to obtain high-quality, flattened tungsten powder in bulk. Plate-shaped WC can also be generated by heating fine-grained WC above a critical temperature, resulting in dissolution-precipitation of plate-shaped WC grains. Another method involves nucleation in a chemical medium and preferential growth along the (0001) crystal plane to form plate-shaped WC. These methods are inefficient in producing plate-shaped crystals and result in a low proportion of plate-shaped crystals. Therefore, this also limits the optimal mechanical properties of plate-shaped WC-Co cemented carbide.

[0004] Furthermore, in the traditional industrial process of preparing WC-Co cemented carbide, both the WC-Co composite powder and the WC-Co composite powder are typically prepared using wet ball milling. Consequently, subsequent powder processing and molding require a series of complex processes such as spray drying and alcohol recovery, leading to long production cycles and high costs. Summary of the Invention

[0005] To address the shortcomings of current plate-like WC-Co cemented carbide preparation technologies, such as complex processes, time-consuming processes, the introduction of impurities, and difficulty controlling carbon content, the present invention aims to provide a streamlined, efficient method for preparing plate-like WC-Co cemented carbide by plasma ball milling. This method uses WC, Co, and a forming agent as raw materials to produce a WC-Co composite powder in a relatively short ball milling time. This powder is then sintered to produce a plate-like WC-Co cemented carbide with a high content of plate-like WC grains.

[0006] The purpose of the present invention is achieved through the following technical solutions.

[0007] The present invention can prepare plate-shaped WC-Co cemented carbide in three steps (see Figure 1 ) and the 4-step method (see Figure 2 ); the three-step method includes plasma ball milling, cold pressing and sintering, and the four-step method includes plasma ball milling, powder mixing, cold pressing and sintering.

[0008] A method for efficiently preparing plate-shaped WC-Co cemented carbide in a short process comprises the following steps:

[0009] (1) WC and Co are mixed and added into a plasma ball mill, and then a forming agent and a process control agent are added, and a discharge atmosphere is filled and plasma ball milling is performed to prepare a WC-Co composite powder;

[0010] (2) pressing the WC-Co composite powder prepared in step (1) into a WC-Co green compact;

[0011] (3) Sintering the WC-Co green body in step (2) to obtain plate-like WC-Co cemented carbide.

[0012] A method for efficiently preparing plate-shaped WC-Co cemented carbide in a short process comprises the following steps:

[0013] (1) WC is added to a plasma ball mill, a process control agent is added, a discharge atmosphere is filled, and plasma ball milling is performed to prepare nano WC powder;

[0014] (2) mixing the nano WC powder prepared in step (1) with Co and a forming agent to prepare a WC-Co composite powder;

[0015] (3) pressing the WC-Co composite powder prepared in step (2) into a WC-Co green compact;

[0016] (4) Sintering the WC-Co green body in step (3) to obtain plate-shaped WC-Co cemented carbide.

[0017] Preferably, the plasma ball milling parameters are: ball-to-material ratio of 15:1 to 100:1, ball milling time of 1h-6h, ball amplitude peak-to-peak value of 10-13mm, ball vibration gravity acceleration of 8-15g, plasma discharge atmosphere of 1×10 3 ~1×10 5 Pa, the input pulse voltage in the ball mill is 15KV-28KV.

[0018] Further preferably, the plasma ball milling parameters are: ball-to-material ratio of 15:1, ball milling time of 1h-6h, peak-to-peak amplitude of the grinding balls of 12mm, gravitational acceleration of the grinding balls of 10g, plasma discharge atmosphere of 0.05MPa, and input pulse voltage in the ball milling jar of 15KV.

[0019] Preferably, the discharge atmosphere is argon with a pressure of 0.03 MPa-0.1 MPa; the dielectric barrier layer of the electrode rod of the plasma ball mill is polytetrafluoroethylene with a thickness of 3 mm-5 mm; the particle size of the WC is 1-1.5 μm, and the particle size of the Co is 0.8-1 μm; the amount of Co is 8 wt.% to 15 wt.% of the total amount of WC and Co.

[0020] More preferably, the amount of Co used is 8 wt.% to 10 wt.% of the total amount of WC and Co.

[0021] Preferably, the process control agent is anhydrous ethanol.

[0022] Preferably, the amount of the process control agent is 1 wt.% to 3 wt.% of the total amount of WC and Co.

[0023] Preferably, the molding agent is polyethylene glycol or paraffin.

[0024] Preferably, the amount of the forming agent is 1 wt.%-5 wt.% of the total amount of WC and Co.

[0025] Preferably, the pressing pressure is 150 MPa-250 MPa.

[0026] Preferably, the sintering parameters are: sintering temperature of 1340° C.-1440° C., holding time of 1 h-2 h, and argon pressure of 4 MPa-5 MPa.

[0027] Preferably, the mixing time in step (2) is 5 h to 10 h.

[0028] This invention utilizes dry plasma ball milling to produce a WC-Co composite powder containing an organic forming agent, avoiding the cumbersome process of wet ball milling. Furthermore, the addition of the forming agent resolves issues associated with subsequent mechanical compaction of the powder. Consequently, this invention overcomes the bottleneck in the industrial application of dry powder production of WC-Co cemented carbide, achieving a combination of high strength and high toughness.

[0029] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0030] (1) The present invention directly uses WC as raw material and realizes the preparation technology of plate-like crystal WC-Co cemented carbide through the innovation of ball milling powder making technology. Under the conditions of traditional ball milling technology, it is difficult to prepare WC plate-like crystals by using WC as raw material, whether it is dry ball milling or wet ball milling. The main reason is related to the deformation mechanism of the WC phase during the mechanical ball milling process. Since the plasma ball milling in the present invention adopts a vibrating mechanical mill, the dislocation movement inside the WC phase is significantly increased under the action of plasma, and the number of cross-slip in the dislocation is significantly increased compared with mechanical ball milling, which is conducive to the ductile deformation of WC particles on the (0001) plane, and therefore is conducive to the growth of WC plate-like crystals during the sintering process. When other mechanical ball milling methods are used to prepare WC nanopowders, it is difficult to form a plate-like crystal structure during the subsequent sintering process.

[0031] (2) The industrial method for preparing cemented carbide includes 10 steps, such as high-temperature carbonization, long-term wet grinding, spray drying, dewaxing, granulation, pressing, dewaxing and sintering. The method for preparing plate-shaped WC-Co cemented carbide of the present invention can produce plate-shaped WC-Co cemented carbide with high strength and high toughness through 3 and 4 steps; at the same time, the WC nanopowder or WC-Co composite nanopowder prepared by the plasma ball milling technology of the present invention can achieve the same effect, providing a wider space for expanding the microstructural control of plate-shaped crystals.

[0032] (3) This invention breaks through the bottleneck of industrial application of dry-process powder production of WC-Co cemented carbide. The short process of plasma ball milling with a mixture of "WC-Co-forming agent" to prepare plate-shaped WC-Co cemented carbide breaks through the dry milling process of adding a forming agent. The subsequent robot pressing and sintering process can be directly connected with the pressing and sintering process of industrial production under wet conditions, which has practical significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a process flow chart of the three-step method in the preparation method of the present invention.

[0034] Figure 2 It is a process flow chart of the four-step method in the preparation method of the present invention.

[0035] Figure 3This is a SEM image of the WC-10wt.% Co composite powder prepared in step (1) of Example 1 of the present invention.

[0036] Figure 4 This is an SEM image of the plate-like WC-10wt.% Co cemented carbide prepared in step (3) of Example 1 of the present invention.

[0037] Figure 5 This is the XRD pattern of the plate-like WC-10wt.% Co cemented carbide prepared in step (3) of Example 1 of the present invention.

[0038] Figure 6 This is an SEM image of the plate-like WC-8wt.%Co cemented carbide prepared in step (3) of Example 2 of the present invention.

[0039] Figure 7 This is an SEM image of the plate-like WC-10wt.% Co cemented carbide prepared in step (3) of Example 3 of the present invention.

[0040] Figure 8 This is an SEM image of the plate-like WC-10wt.% Co cemented carbide prepared in step (3) of Example 4 of the present invention.

[0041] Figure 9 This is an SEM image of the plate-like WC-10wt.% Co cemented carbide prepared in step (3) of Example 5 of the present invention.

[0042] Figure 10 This is an SEM image of the plate-like WC-10wt.%Co cemented carbide prepared in step (3) of Example 6 of the present invention.

[0043] Figure 11 This is the XRD pattern of the plate-like WC-10wt.%Co cemented carbide prepared in step (3) of Example 6 of the present invention.

[0044] Figure 12 This is an SEM image of the plate-like WC-10wt.% Co cemented carbide prepared in step (3) of Example 7 of the present invention.

[0045] Figure 13 This is the XRD pattern of the plate-like WC-10wt.%Co cemented carbide prepared in step (3) of Example 7 of the present invention.

[0046] Figure 14 This is an SEM image of the prismatic WC-10wt.%Co cemented carbide prepared in step (3) of Comparative Example 1 of the present invention.

[0047] Figure 15This is the XRD pattern of the prismatic WC-10wt.%Co cemented carbide prepared in step (3) of Comparative Example 1 of the present invention.

[0048] Figure 16 This is an SEM image of the prismatic WC-10wt.%Co cemented carbide prepared in step (3) of Comparative Example 2 of the present invention. DETAILED DESCRIPTION

[0049] The present invention will be further described in detail below with reference to the examples, but the embodiments of the present invention are not limited thereto.

[0050] In the following examples, the plasma discharge atmosphere was argon, the grinding balls were carbide grinding balls, and the tank was a carbide-lined stainless steel tank. The total volume of the grinding balls accounted for 30% to 50% of the volume of the ball mill. The specific diameters and proportions of the grinding balls were as follows: 22 mm grinding balls accounted for 15%, 15 mm grinding balls accounted for 25%, 10 mm grinding balls accounted for 30%, and 6 mm grinding balls accounted for 30%. The volume of the milled powder accounted for 40% of the spaces between the grinding balls. The ball-to-material ratio was 15:1 to 100:1, the discharge voltage was 15 kV, the peak-to-peak amplitude of the grinding balls was 10 mm to 13 mm, and the gravitational acceleration of the grinding balls was 8 g to 15 g.

[0051] The Vickers hardness (HV 30 ) is measured in accordance with GB / T7997-1987 "Vickers hardness test method for cemented carbide"; the fracture toughness is tested by the indentation method in accordance with ISO 28079-2009 "Hardmetals-Palmqvisttoughness test" standard; the transverse rupture strength (TRS) is measured by the three-point bending method in accordance with GB / T 3851-1983 "Determination of transverse rupture strength of cemented carbide" standard.

[0052] The plate-like morphology of WC grains can be expressed by the aspect ratio of the WC grains (the ratio of the major axis length to the minor axis length of the WC grains). The larger the WC aspect ratio, the more obvious the plate-like WC. The WC aspect ratio is close to 1, which means that the WC morphology is equiaxed.

[0053] Example 1

[0054] (1) WC powder with a particle size of 1-1.5 μm and Co powder with a particle size of 0.8-1 μm are mixed according to the ratio of WC-10wt.%Co, and then the powders are stirred and mixed and put into a plasma ball mill, 2% (mass percentage of the total powder) of polyethylene glycol is added as a molding agent, 2% (mass percentage of the total powder) of anhydrous ethanol is added as a process control agent, 0.05 MPa of argon gas is filled into the ball mill, and the ball mill is subjected to plasma ball milling. The electrode rod has a polytetrafluoroethylene dielectric barrier layer with a thickness of 5 mm, a ball-to-material ratio of 50:1, a ball milling speed of 1380 rpm, a ball amplitude peak-to-peak of 12 mm, a ball vibration gravity acceleration of 10 g, and a ball milling time of 6 h. The SEM image of the prepared WC-10wt.%Co composite powder is shown in FIG. Figure 3 shown.

[0055] (2) The WC-10wt.% Co composite powder obtained in step (1) was charged into a mold and pressed into shape with a unit pressing force of 150 MPa and a holding time of 3 min, followed by demolding to obtain a WC-10wt.% Co green body.

[0056] (3) The WC-10wt.% Co green body obtained in step (2) was placed in a low-pressure sintering furnace, evacuated to below 10Pa, heated to 800℃ at a heating rate of 10℃ / min, kept warm for 30min, then heated to a maximum temperature of 1390℃ at a heating rate of 5℃ / min, and simultaneously filled with 4MPa argon gas, kept warm for 1.5h. Then, the temperature was lowered to room temperature at a heating rate of 10℃ / min. The plate-shaped WC-10wt.% Co cemented carbide was prepared by the above process. The plate-shaped WC morphology is as follows: Figure 4 As shown, the XRD pattern is Figure 5 The mechanical properties and WC aspect ratio are shown in Table 1.

[0057] Example 2

[0058] The steps of this embodiment are basically the same as those of embodiment 1, except that the composite powder in step (1) is prepared according to the WC-8wt.%Co composition. The plate-like WC-8wt.%Co cemented carbide is prepared by the above process, and its plate-like WC morphology is as follows: Figure 6 The mechanical properties and WC aspect ratio are shown in Table 1.

[0059] Example 3

[0060] The steps of this embodiment are basically the same as those of embodiment 1, except that paraffin is selected as the molding agent in step (1). Plate-shaped WC-10wt.% Co cemented carbide is prepared by the above process. The plate-shaped WC morphology is as follows: Figure 7 The mechanical properties and WC aspect ratio are shown in Table 1.

[0061] Example 4

[0062] The steps of this embodiment are basically the same as those of embodiment 1, except that the plasma milling time in step (1) is 1 hour. The plate-like WC-10wt.% Co cemented carbide is prepared by the above process. The plate-like WC morphology is as follows: Figure 8 The mechanical properties and WC aspect ratio are shown in Table 1.

[0063] Example 5

[0064] The steps of this embodiment are basically the same as those of embodiment 1, except that the maximum heating temperature in step (3) is 1340°C. Plate-shaped WC-10wt.%Co cemented carbide is prepared by the above process, and the plate-shaped WC morphology is as follows: Figure 9 The mechanical properties and WC aspect ratio are shown in Table 1.

[0065] Example 6

[0066] The steps of this embodiment are basically the same as those of embodiment 1, except that the maximum heating temperature in step (3) is 1440°C. Plate-shaped WC-10wt.% Co cemented carbide is prepared by the above process, and the plate-shaped WC morphology is as follows: Figure 10 As shown, the XRD pattern is Figure 11 The mechanical properties and WC aspect ratio are shown in Table 1.

[0067] Example 7

[0068] (1) 140 g of WC powder with a particle size of 1-1.5 μm was placed in a plasma ball mill. 2% (by mass of the total powder) of anhydrous ethanol was added as a process control agent. 0.05 MPa of argon gas was then introduced into the mill and the mill was plasma milled. The electrode rod had a polytetrafluoroethylene barrier layer with a thickness of 5 mm. The ball-to-material ratio was 50:1. The milling speed was 1380 rpm, the peak-to-peak amplitude of the milling balls was 12 mm, the gravitational acceleration of the milling balls was 10 g, and the milling time was 6 h.

[0069] (2) The WC powder obtained in step (1) was mixed with Co having a particle size of 0.8-1 μm according to the ratio of WC-10 wt.% Co, and 2% polyethylene glycol was added for mixing. The powder was then placed in a blender for homogenization and stirring for 10 hours to obtain a uniform WC-10 wt.% Co powder.

[0070] (3) The WC-10wt.% Co powder obtained in step (2) was charged into a mold and pressed into shape with a unit pressing force of 150 MPa and a holding time of 3 min, followed by demolding to obtain a WC-10wt.% Co green body.

[0071] (4) The WC-10wt.% Co green body obtained in step (2) was placed in a low-pressure sintering furnace, evacuated to below 10Pa, heated to 800℃ at a heating rate of 10℃ / min, kept warm for 30min, then heated to a maximum temperature of 1390℃ at a heating rate of 5℃ / min, and simultaneously filled with 4MPa argon gas, kept warm for 1.5h. Then the temperature was lowered to room temperature at a rate of 20℃ / min. The plate-shaped WC-10wt.% Co cemented carbide was prepared by the above process. The plate-shaped WC morphology is as follows: Figure 12 As shown, the XRD pattern is Figure 13 The mechanical properties and WC aspect ratio are shown in Table 1.

[0072] Comparative Example 1

[0073] (1) WC powder with a particle size of 1-1.5 μm and Co powder with a particle size of 0.8-1 μm were mixed according to the ratio of WC-10 wt.% Co, 2% (mass percentage of the total powder) of polyethylene glycol was added as a molding agent, and then placed in a blender for homogenization and stirring for 10 h to obtain a uniform WC-10 wt.% Co powder.

[0074] (2) The WC-10Co composite powder obtained in step (1) was charged into a mold and pressed into shape with a unit pressing force of 150 MPa and a holding time of 3 min, followed by demolding to obtain a WC-10wt.%Co green body.

[0075] (3) The WC-10wt.% Co green body obtained in step (2) was placed in a low-pressure sintering furnace, evacuated to below 10Pa, heated to 800℃ at a heating rate of 10℃ / min, kept warm for 30min, then heated to a maximum temperature of 1390℃ at a heating rate of 5℃ / min, and filled with 4MPa argon gas at the same time, kept warm for 1.5h. Then the temperature was cooled to room temperature at a heating rate of 10℃ / min. The plate-shaped WC-10wt.% Co cemented carbide was prepared by the above process. The prismatic WC-10wt.% Co cemented carbide was prepared by the above process. Its WC morphology is as follows: Figure 14 As shown, the XRD pattern is Figure 15 The mechanical properties and WC aspect ratio are shown in Table 1.

[0076] Comparative Example 2

[0077] The steps of this embodiment are basically the same as those of embodiment 4, except that plasma ball milling is not performed in step (1), but conventional ball milling is performed. The specific conventional ball milling conditions are as follows: 0.05MPa argon gas is filled into the ball milling jar, the electrode rod has a polytetrafluoroethylene dielectric barrier layer with a thickness of 5mm, the ball-to-material ratio is 50:1, the ball milling speed is 1380rpm, the peak-to-peak amplitude of the grinding balls is 12mm, and the gravity acceleration of the grinding balls is 10g. These parameters are consistent with the plasma ball milling parameters. The only difference is that no pulse voltage is input into the ball milling jar during the conventional ball milling process, and no plasma discharge phenomenon is generated. Prismatic WC-10wt.%Co cemented carbide is prepared by the above process, and its prismatic WC morphology is as follows: Figure 16 The mechanical properties and WC aspect ratio are shown in Table 1.

[0078] Table 1 Mechanical properties of cemented carbide in each embodiment

[0079]

[0080] Table 1 shows the performance parameters of plate-shaped WC-X wt.% Co cemented carbides prepared in various examples and comparative examples. As shown in Table 1, the WC in the cemented carbides prepared in Examples 1-7 exhibits a large aspect ratio, indicating distinct plate-shaped WC grains. The WC in the cemented carbides prepared in Comparative Examples 1-2 exhibits a smaller aspect ratio, indicating equiaxed WC grains. In terms of mechanical properties, the plate-shaped WC cemented carbides of the present invention exhibit significant advantages in hardness, fracture toughness, and transverse rupture strength compared to the prismatic WC cemented carbides prepared in the comparative examples.

[0081] The above embodiments are preferred implementations of the present invention, but the implementations of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A short-process and efficient method for preparing plate-shaped WC-Co cemented carbide, characterized in that: The following steps are involved: (1) WC and Co are mixed and added to a plasma ball mill, and then a forming agent and a process control agent are added, and a discharge atmosphere is filled to perform plasma ball milling to prepare a WC-Co composite powder; the plasma ball mill is a vibrating mechanical ball mill; in the plasma ball mill, the peak-to-peak amplitude of the grinding ball is 10-13 mm, the gravity acceleration of the grinding ball vibration is 8-15 g, and the pulse voltage input into the ball mill is 15 kV-28 kV; (2) pressing the WC-Co composite powder prepared in step (1) into a WC-Co green body; (3) Sintering the WC-Co green body in step (2) to obtain plate-like WC-Co cemented carbide.

2. A short-process and efficient method for preparing plate-shaped WC-Co cemented carbide, characterized in that: The following steps are involved: (1) WC is added to a plasma ball mill, a process control agent is added, a discharge atmosphere is filled, and plasma ball milling is performed to prepare nano WC powder; the plasma ball mill is a vibrating mechanical ball mill; in the plasma ball mill, the peak-to-peak amplitude of the grinding ball is 10-13 mm, the gravity acceleration of the grinding ball vibration is 8-15 g, and the pulse voltage input into the ball mill is 15 kV-28 kV; (2) mixing the nano WC powder prepared in step (1) with Co and a forming agent to prepare a WC-Co composite powder; (3) pressing the WC-Co composite powder prepared in step (2) into a WC-Co green body; (4) Sintering the WC-Co green body in step (3) to obtain plate-like WC-Co cemented carbide.

3. A short-process and efficient method for preparing plate-shaped WC-Co cemented carbide according to claim 1 or 2, characterized in that: The plasma milling parameters are as follows: ball-to-material ratio of 15:1 to 100:1, milling time of 1 h to 6 h, plasma discharge atmosphere of 1×10 3 ~1×10 5 Pa.

4. A short-process and efficient method for preparing plate-shaped WC-Co cemented carbide according to claim 1 or 2, characterized in that: The discharge atmosphere is argon with a pressure of 0.03 MPa-0.1 MPa; the dielectric barrier layer of the electrode rod of the plasma ball mill is polytetrafluoroethylene with a thickness of 3 mm-5 mm; the particle size of WC is 1-1.5 μm, and the particle size of Co is 0.8-1 μm; the amount of Co is 8wt.%-10wt.% of the total amount of WC and Co.

5. A short-process and efficient method for preparing plate-shaped WC-Co cemented carbide according to claim 1 or 2, characterized in that: The process control agent is anhydrous ethanol.

6. A short-process and efficient method for preparing plate-shaped WC-Co cemented carbide according to claim 1 or 2, characterized in that: The amount of the process control agent used is 1 wt.% to 3 wt.% of the total amount of WC and Co.

7. A short-process and efficient method for preparing plate-shaped WC-Co cemented carbide according to claim 1 or 2, characterized in that: The molding agent is polyethylene glycol or paraffin.

8. A short-process and efficient method for preparing plate-shaped WC-Co cemented carbide according to claim 1 or 2, characterized in that: The amount of the forming agent used is 1 wt.%-5 wt.% of the total amount of WC and Co.

9. A short-process and efficient method for preparing plate-shaped WC-Co cemented carbide according to claim 1 or 2, characterized in that: The pressing pressure is 150 MPa-250 MPa.

10. A short-process and efficient method for preparing plate-shaped WC-Co cemented carbide according to claim 1 or 2, characterized in that: The sintering parameters are as follows: sintering temperature of 1340° C.-1440° C., holding time of 1 h-2 h, and argon pressure of 4 MPa-5 MPa.

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