A plate-like crystal reinforced YT-type cemented carbide and its preparation method and application

Abstract

The present invention belongs to the field of powder metallurgy, and specifically relates to a plate-like crystal reinforced YT-type cemented carbide, its preparation method, and application. The preparation method comprises: wet ball milling and spray drying tungsten carbide powder 1, cobalt powder, and CK32 compound carbide to prepare a mixture 1; placing tungsten carbide 2 in a rotary spray device for rotary wax spraying to prepare wax-containing tungsten carbide; flexibly mixing mixture 1 and wax-containing tungsten carbide to obtain mixture 2; and pressing mixture 2, sintering, and cooling with the furnace to obtain plate-like crystal reinforced YT-type cemented carbide. The plate-like crystal tungsten carbide of the plate-like crystal reinforced YT-type cemented carbide has fine and long plate-like crystal tungsten carbide grains, a hardness HV10 ≥ 1480, and a fracture toughness KiC ≥ 19.20 MPa·m 1 / 2 , density ≥99.5%.

Description

Technical Field

[0001] The present invention belongs to the technical field of powder metallurgy, and specifically relates to a plate-shaped crystal reinforced YT-type cemented carbide and a preparation method and application thereof. Background Art

[0002] YT-type cemented carbide (generally referring to a composite material containing carbides such as TiC and TaC added to WC-Co cemented carbide) is widely used in cutting tools, mining drilling, and wear-resistant components due to its excellent hardness, wear resistance, and high-temperature stability. However, traditional YT-type cemented carbide has relatively low toughness and is prone to brittle fracture or chipping when subjected to impact loads or high-stress conditions, thus affecting its service life and reliability.

[0003] To improve the toughness of YT-type cemented carbides, existing technologies mainly use the following methods: (1) optimizing the binder phase (such as adjusting the Co content or adding elements such as Ni and Cr); (2) introducing nanostructures or gradient structures to enhance the synergistic effect of strength and toughness; and (3) adding second-phase reinforcements (such as whiskers, fibers, or platelets) to improve crack propagation resistance. However, these methods often sacrifice some hardness or wear resistance while improving toughness, making it difficult to achieve a significant improvement in overall performance.

[0004] Research has found that plate-like tungsten carbide, due to its unique morphology and crystal orientation, can act as a toughening agent in cemented carbide, similar to a "brick bridge structure," effectively dissipating fracture energy through crack deflection, branching, and pullout mechanisms. However, the existing preparation process for plate-like WC is complex, and its dispersion, interfacial bonding, and mechanism of influence on mechanical properties in YT-based cemented carbide remain unclear, limiting its practical application.

[0005] Therefore, developing a YT-type cemented carbide based on plate-like crystal tungsten carbide reinforcement, by regulating the size, distribution and interface properties of the plate-like crystals, significantly improving the toughness while maintaining high hardness and wear resistance, has important scientific significance and engineering application value. Summary of the Invention

[0006] In order to solve the problems existing in the prior art, the main purpose of the present invention is to provide a plate-shaped crystal strengthened YT type cemented carbide and its preparation method and application.

[0007] According to the first aspect of the present invention, the present invention provides the following technical solutions:

[0008] A method for preparing plate-like crystal reinforced YT-type cemented carbide comprises the following steps:

[0009] S1, wet ball milling and spray drying tungsten carbide powder 1, cobalt powder, and CK32 compound carbide to prepare a mixture 1;

[0010] S2, placing tungsten carbide 2 in a rotary spray device for rotary wax spraying to prepare wax-containing tungsten carbide;

[0011] S3, softly mixing the mixture 1 and the waxy tungsten carbide to obtain the mixture 2;

[0012] S4. Mixture 2 is pressed and sintered, and then cooled in the furnace to obtain plate-like crystal-reinforced YT-type cemented carbide.

[0013] According to the second aspect of the present invention, the present invention provides the following technical solutions:

[0014] A plate-like crystal reinforced YT-type cemented carbide is prepared by the above-mentioned preparation method of the plate-like crystal reinforced YT-type cemented carbide, wherein the plate-like crystal tungsten carbide of the plate-like crystal reinforced YT-type cemented carbide is fine and long, and the plate-like crystal reinforced YT-type cemented carbide has a hardness HV10 ≥ 1480 and a fracture toughness KiC ≥ 19.20 MPa·m 1 / 2 , density ≥99.5%.

[0015] According to the third aspect of the present invention, the present invention provides the following technical solutions:

[0016] An application of the plate-like crystal reinforced YT-type cemented carbide in the field of cutting blades.

[0017] The beneficial effects of the present invention are as follows:

[0018] The present invention proposes a plate-like crystal-reinforced YT-type cemented carbide and its preparation method and application. The preparation method includes: wet ball milling and spray drying tungsten carbide powder 1, cobalt powder, and CK32 compound carbide to prepare a mixture 1; placing tungsten carbide 2 in a rotary spray device for rotary wax spraying to prepare wax-containing tungsten carbide; flexibly mixing the mixture 1 and the wax-containing tungsten carbide to obtain a mixture 2; and pressing and sintering the mixture 2, followed by furnace cooling, to obtain a plate-like crystal-reinforced YT-type cemented carbide. The plate-like crystal tungsten carbide of the plate-like crystal-reinforced YT-type cemented carbide has fine and long plate-like crystal tungsten carbide grains, a hardness HV10 ≥ 1480, and a fracture toughness KiC ≥ 19.20 MPa·m 1 / 2 , density ≥99.5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1is a SEM image of tungsten carbide 2 used in Example 1 of the present invention;

[0021] Figure 2 This is a metallographic diagram of the cemented carbide prepared in Example 1 of the present invention;

[0022] Figure 3 This is a metallographic diagram of the cemented carbide prepared in Comparative Example 1 of the present invention;

[0023] Figure 4 This is the metallographic diagram of the cemented carbide prepared in Comparative Example 4 of the present invention.

[0024] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0025] The following will be a clear and complete description of the technical solutions in the embodiments. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0026] According to the first aspect of the present invention, the present invention provides the following technical solutions:

[0027] A method for preparing plate-like crystal reinforced YT-type cemented carbide comprises the following steps:

[0028] S1, wet ball milling and spray drying tungsten carbide powder 1, cobalt powder, and CK32 compound carbide to prepare a mixture 1;

[0029] S2, placing tungsten carbide 2 in a rotary spray device for rotary wax spraying to prepare wax-containing tungsten carbide;

[0030] S3, softly mixing the mixture 1 and the waxy tungsten carbide to obtain the mixture 2;

[0031] S4. Mixture 2 is pressed and sintered, and then cooled in the furnace to obtain plate-like crystal-reinforced YT-type cemented carbide.

[0032] Preferably, in step S1, the mass ratio of tungsten carbide powder 1, cobalt powder, and CK32 complex carbide is (85-94): (6-15): (0.5-1.0); the average Fisher grain size of tungsten carbide 1 is 3.5-6.0 μm, and the total carbon content is 6.12-6.14 wt%. Specifically, the average Fisher grain size of tungsten carbide 1 can be, for example, any one of 3.5 μm, 4.0 μm, 4.5 μm, 5.0 μm, 5.5 μm, and 6.0 μm, or a range between any two thereof, and the total carbon content can be, for example, any one of 6.12 wt%, 6.125 wt%, 6.13 wt%, 6.135 wt%, and 6.14 wt%, or a range between any two thereof.

[0033] Preferably, in step S2, the rotary wax spraying pretreatment of the plate-like tungsten carbide ensures that the plate-like tungsten carbide is not damaged and ensures the uniformity of the wax spraying; the tungsten carbide 2 is plate-like tungsten carbide with an aspect ratio ≥3:1, a total carbon of 6.13-6.15wt%, and a combined carbon ratio of ≥98.60wt%; the rotation speed of the rotary wax spraying is 50-80r / min, the wax spraying temperature is 220-350°C, and the wax spraying amount is 3-4wt% of the weight of the tungsten carbide 2. Specifically, the total carbon of tungsten carbide 2 can be, for example, any one of 6.13wt%, 6.135wt%, 6.14wt%, 6.145wt%, 6.15wt% or a range between any two thereof; the rotation speed of the rotary wax spray can be, for example, any one of 50r / min, 55r / min, 60r / min, 65r / min, 70r / min, 75r / min, 80r / min or a range between any two thereof, and the wax spraying temperature can be, for example, 220°C, 230°C, Any one of 240°C, 250°C, 260°C, 270°C, 280°C, 290°C, 300°C, 310°C, 320°C, 330°C, 340°C, 350°C, or a range between any two thereof, and the wax spraying amount can be any one of 3wt%, 3.1wt%, 3.2wt%, 3.3wt%, 3.4wt%, 3.5wt%, 3.6wt%, 3.7wt%, 3.8wt%, 3.9wt%, or 4wt% of the weight of tungsten carbide 2, or a range between any two thereof.

[0034] Preferably, in step S3, tungsten carbide 1 is ball-milled with cobalt powder and CK32 composite carbide, and then plate-shaped tungsten carbide is introduced through flexible mixing. The mass ratio of mixture 1 to waxy tungsten carbide is (86-90):(10-14), and the flexible mixing is performed in a three-dimensional mixer for 120-160 minutes. Specifically, the mixing time can be, for example, any one of 120 minutes, 125 minutes, 130 minutes, 135 minutes, 140 minutes, 145 minutes, 150 minutes, 155 minutes, and 160 minutes, or a range between any two thereof.

[0035] Preferably, in step S4, a sintering furnace is used for sintering, and the sintering process is:

[0036] S41. Raise the temperature to 280-320°C at 10°C / min under a hydrogen atmosphere and keep warm for 30-60 minutes;

[0037] S42. Raise the temperature to 1050-1100°C at 10°C / min under vacuum conditions and keep warm for 90-120 minutes;

[0038] S43, under vacuum conditions, heating to 1300-1350°C at 5°C / min and keeping warm for 180-220 minutes;

[0039] S44. Introduce argon gas, control the pressure in the furnace to 5-8 MPa, the sintering temperature to 1460-1520°C, and keep warm for 120-180 minutes.

[0040] Specifically, in step S41, the insulation temperature can be, for example, any one of 280°C, 285°C, 290°C, 295°C, 300°C, 305°C, 310°C, 315°C, 320°C, or a range between any two of them; the insulation time can be, for example, any one of 30min, 35min, 40min, 45min, 50min, 55min, 60min, or a range between any two of them.

[0041] Specifically, in step S42, the insulation temperature can be, for example, any one of 1050°C, 1060°C, 1070°C, 1080°C, 1090°C, 1100°C, or a range between any two of them; the insulation time can be, for example, any one of 90 min, 95 min, 100 min, 105 min, 110 min, 115 min, 120 min, or a range between any two of them.

[0042] Specifically, in step S43, the insulation temperature can be, for example, any one of 1300°C, 1310°C, 1320°C, 1330°C, 1340°C, and 1350°C, or a range between any two of them; the insulation time can be, for example, any one of 180min, 185min, 190min, 195min, 200min, 205min, 210min, 215min, and 220min, or a range between any two of them.

[0043] Specifically, in step S44, the pressure in the furnace can be, for example, any one of 5 MPa, 6 MPa, 7 MPa, and 8 MPa, or a range between any two of them; the holding temperature can be, for example, any one of 1460°C, 1470°C, 1480°C, 1490°C, 1500°C, 1510°C, and 1520°C, or a range between any two of them; the holding time can be, for example, any one of 120 min, 125 min, 130 min, 135 min, 140 min, 145 min, 150 min, 155 min, 160 min, 165 min, 170 min, 175 min, and 180 min, or a range between any two of them.

[0044] According to the second aspect of the present invention, the present invention provides the following technical solutions:

[0045] A plate-like crystal reinforced YT-type cemented carbide is prepared by the above-mentioned preparation method of the plate-like crystal reinforced YT-type cemented carbide, wherein the plate-like crystal tungsten carbide of the plate-like crystal reinforced YT-type cemented carbide is fine and long, and the plate-like crystal reinforced YT-type cemented carbide has a hardness HV10 ≥ 1480 and a fracture toughness KiC ≥ 19.20 MPa·m 1 / 2 , density ≥99.5%.

[0046] According to the third aspect of the present invention, the present invention provides the following technical solutions:

[0047] An application of the plate-like crystal reinforced YT-type cemented carbide in the field of cutting blades.

[0048] The technical solution of the present invention is further described below with reference to specific embodiments.

[0049] Example 1

[0050] A method for preparing plate-like crystal reinforced YT-type cemented carbide comprises the following steps:

[0051] S1. Wet ball milling and spray drying of tungsten carbide powder 1, cobalt powder, and CK32 compound carbide to prepare a mixture 1. The mass ratio of tungsten carbide powder 1, cobalt powder, and CK32 compound carbide is 90:8:0.6. The average Fisher's particle size of tungsten carbide 1 is 5.0 μm, and the total carbon content is 6.13 wt%.

[0052] S2, placing tungsten carbide 2 in a rotary spray device for rotary wax spraying to prepare wax-containing tungsten carbide; tungsten carbide 2 is a plate-like tungsten carbide (such as Figure 1 As shown in the figure, the aspect ratio is greater than 3:1, the total carbon content is 6.14wt%, and the combined carbon content is 99.20wt%. The rotation speed of the wax spraying machine is 65r / min, the wax spraying temperature is 270℃, and the wax spraying amount is 4wt% of the weight of tungsten carbide.

[0053] S3, softly mixing the mixture 1 and the waxy tungsten carbide to obtain the mixture 2; the mass ratio of the mixture 1 and the waxy tungsten carbide is 90:13, and the mixture is softly mixed in a three-dimensional mixer for 150 minutes;

[0054] S4. Mixture 2 is pressed and then sintered in a sintering furnace. The sintering process is as follows:

[0055] S41, under hydrogen atmosphere, heating to 290°C at 10°C / min and keeping warm for 50 min;

[0056] S42, heating to 1080°C at 10°C / min under vacuum conditions and keeping the temperature for 100 min;

[0057] S43, under vacuum conditions, heating to 1320°C at 5°C / min and holding for 200 min;

[0058] S44, introduce argon, control the pressure in the furnace to 7MPa, sintering temperature to 1490℃, and keep warm for 160min;

[0059] After cooling in the furnace, plate-like crystal-reinforced YT-type cemented carbide is obtained.

[0060] The metallographic image of the plate-like crystal reinforced YT cemented carbide prepared in this embodiment is as follows: Figure 2 As shown, the plate-like tungsten carbide grains of the plate-like crystal strengthened YT type cemented carbide are fine and long, the hardness HV10 of the plate-like crystal strengthened YT type cemented carbide is 1521, and the fracture toughness KiC ≥ 22.69 MPa·m 1 / 2 , the density is 99.73%.

[0061] Example 2

[0062] A method for preparing plate-like crystal reinforced YT-type cemented carbide comprises the following steps:

[0063] S1. Wet ball milling and spray drying of tungsten carbide powder 1, cobalt powder, and CK32 compound carbide to prepare a mixture 1. The mass ratio of tungsten carbide powder 1, cobalt powder, and CK32 compound carbide is 85:15:1.0. The average Fisher's particle size of tungsten carbide 1 is 5.7 μm, and the total carbon content is 6.12 wt%.

[0064] S2. Place tungsten carbide 2 in a rotary spray device for rotary wax spraying to prepare wax-containing tungsten carbide; tungsten carbide 2 is plate-shaped tungsten carbide with an aspect ratio greater than 3:1, a total carbon content of 6.15wt%, and a combined carbon content of 99.03wt%; the rotary wax spraying is performed at a rotation speed of 80r / min, a wax spraying temperature of 350°C, and a wax spraying amount of 4wt% of the weight of tungsten carbide 2;

[0065] S3, softly mixing the mixture 1 and the waxy tungsten carbide to obtain the mixture 2; the mass ratio of the mixture 1 to the waxy tungsten carbide is 86:11, and the mixture is softly mixed in a three-dimensional mixer for 160 minutes;

[0066] S4. Mixture 2 is pressed and then sintered in a sintering furnace. The sintering process is as follows:

[0067] S41, under hydrogen atmosphere, heating to 280°C at 10°C / min and keeping warm for 60 min;

[0068] S42, heating to 1100°C at 10°C / min under vacuum conditions and keeping warm for 90 min;

[0069] S43, heating to 1300°C at 5°C / min under vacuum conditions and holding for 220 min;

[0070] S44, introduce argon, control the pressure in the furnace to 5MPa, sintering temperature to 1520℃, and keep warm for 180min;

[0071] After cooling in the furnace, plate-like crystal-reinforced YT-type cemented carbide is obtained.

[0072] The plate-like tungsten carbide grains of the plate-like crystal reinforced YT cemented carbide prepared in this embodiment are fine and long. The hardness HV10 of the plate-like crystal reinforced YT cemented carbide is 1518, and the fracture toughness KiC is 19.89 MPa·m 1 / 2 , the density is 99.67%.

[0073] Example 3

[0074] A method for preparing plate-like crystal reinforced YT-type cemented carbide comprises the following steps:

[0075] S1. Wet ball milling and spray drying of tungsten carbide powder 1, cobalt powder, and CK32 compound carbide to prepare a mixture 1. The mass ratio of tungsten carbide powder 1, cobalt powder, and CK32 compound carbide is 94:6:1.0. The average Fisher's particle size of tungsten carbide 1 is 3.5 μm, and the total carbon content is 6.12 wt%.

[0076] S2. Place tungsten carbide 2 in a rotary spray device for rotary wax spraying to prepare wax-containing tungsten carbide; tungsten carbide 2 is plate-shaped tungsten carbide with an aspect ratio greater than 3:1, a total carbon content of 6.13wt%, and a combined carbon content of 99.24wt%; the rotary wax spraying speed is 50r / min, the wax spraying temperature is 220°C, and the wax spraying amount is 3.5wt% of the weight of tungsten carbide 2;

[0077] S3, softly mixing the mixture 1 and the waxy tungsten carbide to obtain the mixture 2; the mass ratio of the mixture 1 and the waxy tungsten carbide is 88:14, and the mixture is softly mixed in a three-dimensional mixer for 120 minutes;

[0078] S4. Mixture 2 is pressed and then sintered in a sintering furnace. The sintering process is as follows:

[0079] S41, under hydrogen atmosphere, heating to 280°C at 10°C / min and keeping warm for 60 min;

[0080] S42, heating to 1050°C at 10°C / min under vacuum conditions and keeping warm for 120 min;

[0081] S43, heating to 1300°C at 5°C / min under vacuum conditions and holding for 220 min;

[0082] S44, introduce argon, control the pressure in the furnace to 8 MPa, sintering temperature to 1460 ° C, and keep warm for 180 minutes;

[0083] After cooling in the furnace, plate-like crystal-reinforced YT-type cemented carbide is obtained.

[0084] The plate-like tungsten carbide grains of the plate-like crystal reinforced YT cemented carbide prepared in this embodiment are fine and long. The hardness HV10 of the plate-like crystal reinforced YT cemented carbide is 1542, and the fracture toughness KiC is 20.91 MPa·m 1 / 2 , the density is 99.66%.

[0085] Comparative Example 1

[0086] The difference from Example 1 is that the cemented carbide was prepared according to a traditional production process. Specifically, tungsten carbide 1, tungsten carbide 2, cobalt powder, and CK32 composite carbide were added to a ball mill in a ratio of 81:13:7.2:0.54, and wet ball milling and pressing and sintering were performed to prepare YT-type cemented carbide. The ball milling time was 24 hours, and the ball-to-material ratio was 5:1. The sintering process was the same as that of Example 1.

[0087] The metallographic image of the cemented carbide prepared in this comparative example is as follows: Figure 3 As shown, it has no plate-like crystal structure, a hardness HV10 of 1454, and a fracture toughness KiC of 13.40 MPa·m 1 / 2 , the density is 99.56%.

[0088] Comparative Example 2

[0089] The difference from Example 1 is that tungsten carbide 1, tungsten carbide 2, cobalt powder, and CK32 are all subjected to conventional wet ball milling, replacing steps S1 to S3 of Example 1.

[0090] The cemented carbide prepared in this comparative example has no plate-like crystal structure, a hardness HV10 of 1431, and a fracture toughness KiC of 14.09 MPa·m 1 / 2 , the density is 99.61%.

[0091] Comparative Example 3

[0092] The difference from Example 1 is that step S2 is not performed.

[0093] The plate-like tungsten carbide grains of the cemented carbide prepared in this comparative example are fine and long, with a hardness HV10 of 1503 and a fracture toughness KiC of 20.40 MPa·m 1 / 2 , the density is 97.59%.

[0094] Comparative Example 4

[0095] The difference from Example 1 is that in step S4, the sintering process is:

[0096] S41, under hydrogen atmosphere, heating to 290°C at 10°C / min and keeping warm for 50 min;

[0097] S42, heating to 1320°C at 10°C / min under vacuum conditions and keeping warm for 200 min;

[0098] S43, introduce argon, control the pressure in the furnace to 7MPa, sintering temperature to 1490℃, and keep warm for 160min;

[0099] The metallographic image of the cemented carbide prepared in this comparative example is as follows: Figure 4As shown, the plate crystal has a small aspect ratio, a hardness HV10 of 1388, and a fracture toughness KiC of 15.66 MPa·m 1 / 2 , the density is 99.69%.

[0100] Samples prepared in Examples 1, 2, and 3, as well as Comparative Examples 1, 2, 3, and 4, were tested in cast iron cutting using a German DMG NXL40001750 machine tool. The cutting speed was 290 m / min, the feed rate was 0.35 mm / r, and the cooling method was liquid wet machining. The test results are as follows. As shown in the table below, the plate-grain-reinforced YT-type cemented carbides prepared in the present examples exhibit significantly improved wear resistance compared to the cemented carbides prepared in the comparative examples.

[0101]

[0102] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for preparing plate-like crystal reinforced YT-type cemented carbide, characterized in that: The steps include: S1, wet ball milling and spray drying tungsten carbide powder 1, cobalt powder, and CK32 compound carbide to prepare a mixture 1; S2, placing tungsten carbide 2 in a rotary spray device for rotary wax spraying to prepare wax-containing tungsten carbide; tungsten carbide 2 is plate-shaped tungsten carbide; the rotation speed of the rotary wax spraying is 50-80 r / min, and the wax spraying temperature is 220-350°C; S3, softly mixing the mixture 1 and the waxy tungsten carbide to obtain the mixture 2; S4, after the mixture 2 is pressed, it is sintered and cooled in the furnace to obtain plate-like crystal-reinforced YT-type cemented carbide; In step S4, sintering is performed in a sintering furnace, and the sintering process is as follows: S41. In a hydrogen atmosphere, heat the mixture to 280-320°C at a rate of 10°C / min and keep the temperature for 30-60 min. S42. Raise the temperature to 1050-1100°C at 10°C / min under vacuum conditions and keep warm for 90-120 minutes; S43, under vacuum conditions, heating to 1300-1350°C at 5°C / min and holding for 180-220 min; S44. Introduce argon gas, control the pressure in the furnace to 5-8 MPa, the sintering temperature to 1460-1520°C, and keep warm for 120-180 minutes.

2. The method for preparing plate-like crystal reinforced YT cemented carbide according to claim 1, characterized in that: In the step S1, the mass ratio of tungsten carbide powder 1, cobalt powder, and CK32 compound carbide is (85-94): (6-15): (0.5-1.0).

3. The method for preparing plate-like crystal reinforced YT cemented carbide according to claim 1, characterized in that: In step S1, the average Fisher's particle size of the tungsten carbide powder 1 is 3.5-6.0 μm, and the total carbon content is 6.12-6.14 wt%.

4. The method for preparing plate-like crystal reinforced YT cemented carbide according to claim 1, characterized in that: In step S2, the aspect ratio of the plate-shaped tungsten carbide is ≥3:1, the total carbon content is 6.13-6.15 wt%, and the combined carbon content is ≥98.60 wt%.

5. The method for preparing plate-like crystal reinforced YT cemented carbide according to claim 1, characterized in that: In step S2, the amount of wax sprayed is 3-4 wt% of the weight of the tungsten carbide 2.

6. The method for preparing plate-like crystal reinforced YT cemented carbide according to claim 1, characterized in that: In step S3, the mass ratio of the mixture 1 to the waxy tungsten carbide is (86-90): (10-14), and the mixture is softly mixed in a three-dimensional mixer for 120-160 minutes.

7. A plate-like crystal strengthened YT-type cemented carbide, characterized in that: The plate-like crystal strengthened YT cemented carbide is prepared by the preparation method of any one of claims 1 to 6, wherein the plate-like crystal tungsten carbide of the plate-like crystal strengthened YT cemented carbide is fine and long, and the plate-like crystal strengthened YT cemented carbide has a hardness HV10 ≥ 1480 and a fracture toughness KiC ≥ 19.20 MPa·m 1 / 2 , density ≥99.5%.

8. Use of the plate-like crystal strengthened YT type cemented carbide according to claim 7 in the field of cutting inserts.

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