Plate-shaped crystal reinforced YT hard alloy and preparation method and application thereof

Abstract

The invention belongs to the technical field of powder metallurgy, and particularly relates to a tabular crystal strengthened YT hard alloy and a preparation method and application thereof.The preparation method comprises the steps that tungsten carbide powder 1, cobalt powder and CK32 compound carbide are subjected to wet ball milling-spray drying, and a mixture 1 is prepared; the tungsten carbide 2 is placed in a rotary spraying device for rotary wax spraying, and wax-containing tungsten carbide is prepared; flexibly mixing the mixture 1 and wax-containing tungsten carbide to obtain a mixture 2; and pressing the mixture 2, sintering, and cooling along with a furnace to obtain the plate-shaped crystal strengthened YT hard alloy. The tabular crystal tungsten carbide grains of the tabular crystal strengthened YT hard alloy are fine and long, the hardness HV10 of the tabular crystal strengthened YT hard alloy is larger than or equal to 1480, the fracture toughness KiC of the tabular crystal strengthened YT hard alloy is larger than or equal to 19.20 MPa.m < 1 / 2 >, and the density of the tabular crystal strengthened YT hard alloy is larger than or equal to 99.5%.

Description

Technical Field

[0001] The present invention belongs to the technical field of powder metallurgy, and specifically relates to a plate-like crystal strengthened YT-based cemented carbide and its preparation method and application. Background Art

[0002] YT-based cemented carbides (usually composite materials obtained by adding carbides such as TiC and TaC to WC-Co-based cemented carbides) are widely used in fields such as cutting tools, mine drilling, and wear-resistant components due to their excellent hardness, wear resistance, and high-temperature stability. However, the toughness of traditional YT-based cemented carbides is relatively low, and brittle fracture or chipping is likely to occur under impact loads or high-stress working conditions, thus affecting their service life and reliability.

[0003] To improve the toughness of YT-based cemented carbides, the following methods are mainly adopted in the prior art: (1) optimizing the binder phase (such as adjusting the Co content or adding elements such as Ni and Cr); (2) introducing a nanostructure or gradient structure to enhance the synergistic effect of strength and toughness; (3) adding a second-phase reinforcement (such as whiskers, fibers, or platelets) to improve the crack propagation resistance. However, these methods often sacrifice some hardness or wear resistance while improving toughness, and it is difficult to achieve a significant improvement in comprehensive performance.

[0004] Research has found that: plate-like tungsten carbide can play a toughening role similar to the "brick bridge structure" in cemented carbides due to its unique morphology and crystal orientation, and effectively consume fracture energy through crack deflection, branching, and pulling-out mechanisms. However, the preparation process of plate-like WC in the prior art is complex, and its dispersion, interfacial bonding, and the influence mechanism on mechanical properties in YT-based cemented carbides are not yet clear, which limits its practical application.

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

[0006] To solve the problems existing in the prior art, the main object of the present invention is to propose a plate-like crystal strengthened YT-based cemented carbide and its preparation method and application.

[0007] According to the first aspect of the present invention, the following technical solution is provided: A preparation method of a plate-like crystal strengthened YT-based cemented carbide, comprising the following steps: S1. Wet ball milling - spray drying tungsten carbide powder 1, cobalt powder, and CK32 double carbide to prepare mixture 1; S2. Rotationally spray wax on tungsten carbide 2 in a rotary spray device to prepare wax-containing tungsten carbide; S3. Flexibly mix the mixture 1 and the wax-containing tungsten carbide to obtain mixture 2; S4. Press and sinter mixture 2, and then cool it in the furnace to obtain the plate-shaped crystal strengthened YT-type cemented carbide.

[0008] According to the second aspect of the present invention, the present invention provides the following technical solution: A plate-shaped crystal strengthened YT-type cemented carbide is prepared by using the preparation method of the plate-shaped crystal strengthened YT-type cemented carbide described above. The plate-shaped crystal tungsten carbide grains of the plate-shaped crystal strengthened YT-type cemented carbide are thin and long. The hardness HV10 of the plate-shaped crystal strengthened YT-type cemented carbide is ≥1480, and the fracture toughness KiC is ≥19.20 MPa·m 1 / 2 , and the relative density is ≥99.5%.

[0009] According to the third aspect of the present invention, the present invention provides the following technical solution: An application of the above-mentioned plate-shaped crystal strengthened YT-type cemented carbide in the field of cutting blades.

[0010] The beneficial effects of the present invention are as follows: The present invention provides a plate-shaped crystal strengthened YT-type cemented carbide, its preparation method and application. The preparation method includes: wet ball milling and spray drying tungsten carbide powder 1, cobalt powder, and CK32 double carbide to obtain mixture 1; placing tungsten carbide 2 in a rotary spraying device for rotary wax spraying to obtain wax-containing tungsten carbide; flexibly mixing mixture 1 and wax-containing tungsten carbide to obtain mixture 2; pressing and sintering mixture 2, and then cooling it in the furnace to obtain the plate-shaped crystal strengthened YT-type cemented carbide. The plate-shaped crystal tungsten carbide grains of the plate-shaped crystal strengthened YT-type cemented carbide are thin and long. The hardness HV10 of the plate-shaped crystal strengthened YT-type cemented carbide is ≥1480, and the fracture toughness KiC is ≥19.20 MPa·m 1 / 2 , and the relative density is ≥99.5%. Description of the Drawings

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0012] Figure 1 It is the SEM image of tungsten carbide 2 used in Example 1 of the present invention; Figure 2 It is the metallographic image of the cemented carbide prepared in Example 1 of the present invention; Figure 3Metallographic diagram of the cemented carbide prepared in Comparative Example 1 of the present invention; Figure 4 Metallographic diagram of the cemented carbide prepared in Comparative Example 4 of the present invention.

[0013] The realization, functional characteristics and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific Embodiments

[0014] The technical solutions in the embodiments will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0015] According to the first aspect of the present invention, the following technical solutions are provided: A preparation method of a plate crystal strengthened YT type cemented carbide, comprising the following steps: S1. Wet ball milling - spray drying tungsten carbide powder 1, cobalt powder and CK32 double carbide to prepare mixture 1; S2. Place tungsten carbide 2 in a rotary spraying device for rotary wax spraying to prepare wax-containing tungsten carbide; S3. Flexibly mix mixture 1 and wax-containing tungsten carbide to obtain mixture 2; S4. After pressing mixture 2, sinter it and cool it with the furnace to obtain a plate crystal strengthened YT type cemented carbide.

[0016] Preferably, in the step S1, the mass ratio of tungsten carbide powder 1, cobalt powder and CK32 double carbide is (85 - 94):(6 - 15):(0.5 - 1.0); and the average Fisher particle size of tungsten carbide 1 is 3.5 - 6.0 μm, and the total carbon is 6.12 - 6.14 wt%. Specifically, the average Fisher particle 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, 6.0 μm or the range between any two of them, and the total carbon can be, for example, any one of 6.12 wt%, 6.125 wt%, 6.13 wt%, 6.135 wt%, 6.14 wt% or the range between any two of them.

[0017] Preferably, in the step S2, the rotary wax spraying pretreatment of the plate-shaped tungsten carbide not only ensures that the plate-shaped tungsten carbide is not damaged, but also ensures the uniformity of wax spraying; tungsten carbide 2 is plate-shaped tungsten carbide, with an aspect ratio of ≥ 3:1, total carbon of 6.13 - 6.15 wt%, and combined carbon accounting for ≥ 98.60 wt%; the rotation speed of rotary wax spraying is 50 - 80 r / min, the wax spraying temperature is 220 - 350 °C, and the wax spraying amount is 3 - 4 wt% of the weight of tungsten carbide 2. Specifically, the total carbon of tungsten carbide 2 can be any one or the range between any two of, for example, 6.13 wt%, 6.135 wt%, 6.14 wt%, 6.145 wt%, 6.15 wt%; the rotation speed of rotary wax spraying can be any one or the range between any two of, for example, 50 r / min, 55 r / min, 60 r / min, 65 r / min, 70 r / min, 75 r / min, 80 r / min, the wax spraying temperature can be any one or the range between any two of, for example, 220 °C, 230 °C, 240 °C, 250 °C, 260 °C, 270 °C, 280 °C, 290 °C, 300 °C, 310 °C, 320 °C, 330 °C, 340 °C, 350 °C, and the wax spraying amount can be any one or the range between any two of, for example, 3 wt%, 3.1 wt%, 3.2 wt%, 3.3 wt%, 3.4 wt%, 3.5 wt%, 3.6 wt%, 3.7 wt%, 3.8 wt%, 3.9 wt%, 4 wt% of the weight of tungsten carbide 2.

[0018] Preferably, in the step S3, tungsten carbide 1 is ball-milled and mixed with cobalt powder and CK32 composite carbide, and then plate-shaped tungsten carbide is introduced through flexible mixing. The mass ratio of the mixture 1 to the wax-containing tungsten carbide is (86 - 90):(10 - 14), and flexible mixing is carried out in a three-dimensional mixer for 120 - 160 min. Specifically, the mixing time can be any one or the range between any two of, for example, 120 min, 125 min, 130 min, 135 min, 140 min, 145 min, 150 min, 155 min, 160 min.

[0019] Preferably, in the step S4, sintering is carried out using a sintering furnace, and the sintering process is as follows: S41. Heat up to 280 - 320 °C at a rate of 10 °C / min in a hydrogen atmosphere and hold for 30 - 60 min; S42. Heat up to 1050 - 1100 °C at a rate of 10 °C / min under vacuum conditions and hold for 90 - 120 min; S43. Heat up to 1300 - 1350 °C at a rate of 5 °C / min under vacuum conditions and hold for 180 - 220 min; S44. Introduce argon gas, control the pressure in the furnace to be 5 - 8 MPa, the sintering temperature to be 1460 - 1520 °C, and keep the temperature for 120 - 180 min.

[0020] Specifically, in the step S41, the heat preservation 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 the range between any two of them; the heat preservation time can be, for example, any one of 30 min, 35 min, 40 min, 45 min, 50 min, 55 min, 60 min or the range between any two of them.

[0021] Specifically, in the step S42, the heat preservation temperature can be, for example, any one of 1050 °C, 1060 °C, 1070 °C, 1080 °C, 1090 °C, 1100 °C or the range between any two of them; the heat preservation time can be, for example, any one of 90 min, 95 min, 100 min, 105 min, 110 min, 115 min, 120 min or the range between any two of them.

[0022] Specifically, in the step S43, the heat preservation temperature can be, for example, any one of 1300 °C, 1310 °C, 1320 °C, 1330 °C, 1340 °C, 1350 °C or the range between any two of them; the heat preservation time can be, for example, any one of 180 min, 185 min, 190 min, 195 min, 200 min, 205 min, 210 min, 215 min, 220 min or the range between any two of them.

[0023] Specifically, in the step S44, the pressure in the furnace can be, for example, any one of 5 MPa, 6 MPa, 7 MPa, 8 MPa or the range between any two of them; the heat preservation temperature can be, for example, any one of 1460 °C, 1470 °C, 1480 °C, 1490 °C, 1500 °C, 1510 °C, 1520 °C or the range between any two of them; the heat preservation 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, 180 min or the range between any two of them.

[0024] According to the second aspect of the present invention, the present invention provides the following technical solutions: A plate-shaped crystal strengthened YT-based cemented carbide is prepared by using the preparation method of the plate-shaped crystal strengthened YT-based cemented carbide described above. The plate-shaped crystal tungsten carbide grains of the plate-shaped crystal strengthened YT-based cemented carbide are fine and long. The hardness HV10 of the plate-shaped crystal strengthened YT-based cemented carbide is ≥1480, and the fracture toughness KiC is ≥19.20 MPa·m 1 / 2 , and the relative density is ≥99.5%.

[0025] According to the third aspect of the present invention, the present invention provides the following technical solution: An application of the above-mentioned plate-shaped crystal strengthened YT-based cemented carbide in the field of cutting blades.

[0026] The technical solution of the present invention will be further described below in conjunction with specific embodiments.

[0027] Example 1 A preparation method of a plate-shaped crystal strengthened YT-based cemented carbide includes the following steps: S1. Wet ball milling-spray drying of tungsten carbide powder 1, cobalt powder, and CK32 double carbide is carried out to prepare mixture 1; the mass ratio of tungsten carbide powder 1, cobalt powder, and CK32 double carbide is 90:8:0.6; and the average Fisher particle size of tungsten carbide 1 is 5.0 μm, and the total carbon is 6.13 wt%; S2. Tungsten carbide 2 is placed in a rotary spraying device for rotary wax spraying to prepare wax-containing tungsten carbide; tungsten carbide 2 is plate-shaped tungsten carbide (as Figure 1 shown), the aspect ratio is greater than 3:1, the total carbon is 6.14 wt%, and the proportion of combined carbon is 99.20 wt%; the rotation speed of rotary wax spraying is 65 r / min, the wax spraying temperature is 270 °C, and the wax spraying amount is 4 wt% of the weight of tungsten carbide 2; S3. Mixture 1 and wax-containing tungsten carbide are flexibly mixed to obtain mixture 2; the mass ratio of mixture 1 and wax-containing tungsten carbide is 90:13, and flexible mixing is carried out in a three-dimensional mixer, and the mixing time is 150 min; S4. After mixture 2 is pressed, sintering is carried out. Sintering is carried out in a sintering furnace, and the sintering process is as follows: S41. Heat up to 290 °C at a rate of 10 °C / min in a hydrogen atmosphere and hold for 50 min; S42. Heat up to 1080 °C at a rate of 10 °C / min under vacuum conditions and hold for 100 min; S43. Heat up to 1320 °C at a rate of 5 °C / min under vacuum conditions and hold for 200 min; S44. Introduce argon, control the furnace pressure to 7 MPa, the sintering temperature is 1490 °C, and hold for 160 min; Cool with the furnace to obtain the plate-shaped crystal strengthened YT-based cemented carbide.

[0028] The metallographic diagram of the plate crystal strengthened YT type cemented carbide prepared in this example is as follows Figure 2 shown. The plate crystal tungsten carbide grains of the plate crystal strengthened YT type cemented carbide are thin and long. The hardness HV10 of the plate crystal strengthened YT type cemented carbide is 1521, and the fracture toughness KiC≥22.69MPa·m 1 / 2 , and the relative density is 99.73%.

[0029] Example 2 A preparation method of a plate crystal strengthened YT type cemented carbide includes the following steps: S1. Wet ball milling - spray drying of tungsten carbide powder 1, cobalt powder, and CK32 double carbide to prepare mixture 1; the mass ratio of tungsten carbide powder 1, cobalt powder, and CK32 double carbide is 85:15:1.0; and the average Fisher particle size of tungsten carbide 1 is 5.7μm, and the total carbon is 6.12wt%; S2. Rotating spray waxing of tungsten carbide 2 in a rotating spray device to prepare wax - containing tungsten carbide; tungsten carbide 2 is plate - shaped tungsten carbide with an aspect ratio greater than 3:1, the total carbon is 6.15wt%, and the proportion of combined carbon is 99.03wt%; the rotating speed of rotating spray waxing is 80r / min, the waxing temperature is 350°C, and the waxing amount is 4wt% of the weight of tungsten carbide 2; S3. Flexibly mixing mixture 1 and wax - containing tungsten carbide to obtain mixture 2; the mass ratio of mixture 1 and wax - containing tungsten carbide is 86:11, and flexible mixing is carried out in a three - dimensional mixer for 160min; S4. After pressing mixture 2, sintering is carried out using a sintering furnace, and the sintering process is as follows: S41. Heating to 280°C at a rate of 10°C / min in a hydrogen atmosphere and holding for 60min; S42. Heating to 1100°C at a rate of 10°C / min under vacuum conditions and holding for 90min; S43. Heating to 1300°C at a rate of 5°C / min under vacuum conditions and holding for 220min; S44. Introducing argon, controlling the furnace pressure to be 5MPa, the sintering temperature to be 1520°C, and holding for 180min; Cooling with the furnace to obtain the plate crystal strengthened YT type cemented carbide.

[0030] The plate crystal tungsten carbide grains of the plate crystal strengthened YT type cemented carbide prepared in this example are thin and long. The hardness HV10 of the plate crystal strengthened YT type cemented carbide is 1518, and the fracture toughness KiC is 19.89MPa·m 1 / 2 , and the relative density is 99.67%.

[0031] Example 3 A preparation method of a plate crystal strengthened YT type cemented carbide, comprising the following steps: S1. Wet ball milling - spray drying of tungsten carbide powder 1, cobalt powder, and CK32 double carbide is carried out to prepare mixture 1; the mass ratio of tungsten carbide powder 1, cobalt powder, and CK32 double carbide is 94:6:1.0; and the average Fischer particle size of tungsten carbide 1 is 3.5 μm, and the total carbon is 6.12 wt%; S2. Tungsten carbide 2 is placed in a rotary spraying 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, the total carbon is 6.13 wt%, and the combined carbon accounts for 99.24 wt%; the rotation speed of rotary wax spraying is 50 r / min, the wax spraying temperature is 220 °C, and the wax spraying amount is 3.5 wt% of the weight of tungsten carbide 2; S3. Mixture 1 and wax - containing tungsten carbide are flexibly mixed to obtain mixture 2; the mass ratio of mixture 1 and wax - containing tungsten carbide is 88:14, and flexible mixing is carried out in a three - dimensional mixer, and the mixing time is 120 min; S4. After the mixture 2 is pressed, sintering is carried out using a sintering furnace, and the sintering process is as follows: S41. Heat up to 280 °C at a rate of 10 °C / min in a hydrogen atmosphere and hold for 60 min; S42. Heat up to 1050 °C at a rate of 10 °C / min under vacuum conditions and hold for 120 min; S43. Heat up to 1300 °C at a rate of 5 °C / min under vacuum conditions and hold for 220 min; S44. Introduce argon, control the furnace pressure to be 8 MPa, the sintering temperature to be 1460 °C, and hold for 180 min; Cool with the furnace to obtain the plate crystal strengthened YT type cemented carbide.

[0032] The plate - shaped crystal tungsten carbide grains of the plate crystal strengthened YT type cemented carbide prepared in this example are fine and long. The hardness HV10 of the plate crystal strengthened YT type cemented carbide is 1542, and the fracture toughness KiC is 20.91 MPa·m 1 / 2 , and the relative density is 99.66%.

[0033] Comparative Example 1 The difference from Example 1 is that, according to the traditional production process, a cemented carbide is prepared. Specifically: Tungsten carbide 1, tungsten carbide 2, cobalt powder, and CK32 double carbide are added to a ball mill in a ratio of 81:13:7.2:0.54 for wet ball milling, pressing and sintering to prepare a YT type cemented carbide. The ball milling time is 24 h, and the ball - to - material ratio is 5:1. The sintering process is the same as that in Example 1.

[0034] The metallographic diagram of the cemented carbide prepared in this comparative example is as follows Figure 3 shown. It has no plate crystal structure, the hardness HV10 is 1454, and the fracture toughness KiC is 13.40 MPa·m 1 / 2 , and the relative density is 99.56%.

[0035] Comparative Example 2 The difference from Example 1 is that tungsten carbide 1, tungsten carbide 2, cobalt powder, and CK32 are subjected to traditional wet ball milling together. Steps S1-S3 of Example 1 are replaced.

[0036] The cemented carbide prepared in this comparative example has no plate crystal structure, the hardness HV10 is 1431, and the fracture toughness KiC is 14.09 MPa·m 1 / 2 , and the relative density is 99.61%.

[0037] Comparative Example 3 The difference from Example 1 is that step S2 is not carried out.

[0038] The plate crystal tungsten carbide grains of the cemented carbide prepared in this comparative example are thin and long, the hardness HV10 is 1503, and the fracture toughness KiC is 20.40 MPa·m 1 / 2 , and the relative density is 97.59%.

[0039] Comparative Example 4 The difference from Example 1 is that in step S4, the sintering process is as follows: S41. Heat up to 290 °C at a rate of 10 °C / min in a hydrogen atmosphere and hold for 50 min; S42. Heat up to 1320 °C at a rate of 10 °C / min under vacuum conditions and hold for 200 min; S43. Introduce argon, control the furnace pressure to 7 MPa, the sintering temperature to 1490 °C, and hold for 160 min; The metallographic diagram of the cemented carbide prepared in this comparative example is as follows Figure 4 shown. Its plate crystal aspect ratio is small, the hardness HV10 is 1388, and the fracture toughness KiC is 15.66 MPa·m 1 / 2 , and the relative density is 99.69%.

[0040] The samples prepared in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 4 were subjected to cast iron cutting tests. The machine tool was a German DMG NLX4000 1750 type, the cutting speed was 290 m / min, the feed rate was 0.35 mm / r, and the cooling method was: coolant wet machining. The test results are as follows. It can be seen from the following table that the plate crystal reinforced YT type cemented carbide prepared in the examples of the present invention has significantly improved wear resistance compared to the cemented carbide prepared in the comparative examples.

[0041] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the content of the specification of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is 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-like tungsten carbide; S3, flexibly mixing the mixture 1 and the waxy tungsten carbide to obtain a mixture 2; S4. Mixture 2 is pressed and sintered, and then cooled in the furnace to obtain plate-like crystal reinforced YT type cemented carbide.

2. The method for preparing plate-like crystal reinforced YT-type 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 complex carbide is (85-94): (6-15): (0.5-1.0).

3. The method for preparing plate-like crystal reinforced YT-type cemented carbide according to claim 1, characterized in that: In the step S1, the average Fisher grain size of the tungsten carbide 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-type cemented carbide according to claim 1, characterized in that: In step S2, the aspect ratio of the plate-like tungsten carbide is ≥3:1, the total carbon content is 6.13-6.15wt%, and the combined carbon content is ≥98.60wt%.

5. The method for preparing plate-like crystal reinforced YT-type cemented carbide according to claim 1, characterized in that: In step S2, the rotation speed of the rotary wax spray is 50-80 r / min, and the wax spray temperature is 220-350°C.

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

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

8. The method for preparing plate-like crystal reinforced YT-type cemented carbide according to claim 1, characterized in that: In the step S4, a sintering furnace is used for sintering, and the sintering process is as follows: S41, heating to 280-320°C at 10°C / min under hydrogen atmosphere, and keeping warm for 30-60min; S42, under vacuum conditions, heating to 1050-1100°C at 10°C / min, and keeping warm for 90-120min; S43, under vacuum conditions, heating to 1300-1350°C at 5°C / min, and keeping the temperature for 180-220min; S44, introduce argon gas, control the pressure in the furnace to 5-8MPa, the sintering temperature to 1460-1520℃, and keep warm for 120-180min.

9. A plate-like crystal strengthened YT-type cemented carbide, characterized in that: The plate-like crystal reinforced YT cemented carbide is prepared by the preparation method of any one of claims 1 to 8, wherein the plate-like crystal tungsten carbide grains of the plate-like crystal reinforced YT cemented carbide are fine and long, the hardness of the plate-like crystal reinforced YT cemented carbide is HV10≥1480, and the fracture toughness KiC≥19.20MPa·m 1 / 2 , density ≥99.5%.

10. Use of the plate-like crystal reinforced YT type cemented carbide according to claim 9 in the field of cutting blades.

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