High-hardness and high-strength hard alloy coating blade

Abstract

The invention belongs to the technical field of hard alloy material preparation, and relates to a high-hardness and high-strength hard alloy coating blade which comprises a base body and a coating. The matrix raw materials comprise the following components in percentage by weight: 89-90% of tungsten carbide WC, 6-7% of Co, 1-3% of a tungsten-titanium solid solution and 1-3% of a tantalum-niobium solid solution; the coating comprises an AlTiN substrate layer, a TiAlSiN functional layer and a TiSiN surface layer. The high-hardness and high-strength hard alloy matrix is prepared by adding the reinforcing solvent, and the coating with the specific gradient composite structure is deposited by combining the arc ion plating technology, so that the internal defects of the coating are reduced, the internal stress of the coating is reduced, the toughness and the film-substrate binding force of the coating are improved, and the coating is uniform and compact, has high hardness and high-temperature oxidation resistance, and can be applied to the field of high-temperature-resistant coating. The service life of the blade is greatly prolonged through good matching of the coating and the blade base body.

Description

Technical Field

[0001] The invention belongs to the technical field of cemented carbide material preparation, and in particular relates to a high-hardness and high-strength cemented carbide coating blade. Background Art

[0002] Cemented carbide has a series of excellent properties such as high hardness, high strength, high wear resistance, high high temperature hardness, good chemical stability, etc., and is widely used in the field of modern machining and cutting. With the development of science and technology, the use of cemented carbide is becoming more and more extensive, and people's performance requirements for cemented carbide are getting higher and higher. As a result, coated cemented carbide has developed rapidly, the output has increased significantly, the application field has been continuously expanded, and it has been widely used in industry.

[0003] The contradiction between hardness and strength generally exists in cemented carbide materials. The use of coating technology can effectively solve the contradiction in cemented carbide materials, that is, maintain the toughness of the base material, improve the wear resistance of the tool, and enhance the cutting performance of the tool. In addition, with the increasing use of various difficult-to-process materials, the thermal conductivity of difficult-to-process materials is low during the cutting process, resulting in the inability to diffuse heat during cutting, causing the temperature of the cemented carbide blade to be too high, and the bonding strength of the tool at high temperature to decrease, accelerating tool wear and reducing processing life. The surface coating of cemented carbide tools acts as a chemical barrier and thermal barrier, reducing the friction coefficient between the tool and the workpiece, effectively reducing the heat generated by the friction between the tool and the workpiece, reducing the crater wear of the cemented carbide tool, and significantly improving the processing efficiency, processing accuracy and tool life.

[0004] With the continuous development of the manufacturing industry, the requirements for the surface hardness, wear resistance, and oxidation resistance of materials are constantly increasing. It is difficult for a single film material to meet the requirements for improving the comprehensive performance of parts. The multi-component composite coating obtained by adding different alloy elements to the binary nitride film TiN effectively improves the comprehensive performance of the coating. Ti-Al-Si-N coatings have the characteristics of high hardness, excellent wear resistance, high temperature oxidation resistance, and thermal stability, and have become a research hotspot in the field of surface coatings.

[0005] Chinese invention patent CN106480417A discloses a TiAlSiN-AlTiN composite coating and preparation process. The coating adopts arc and magnetron sputtering composite coating technology, wherein the atomic composition ratio of Al and Ti elements is Al / Ti=67 / 33, and the atomic composition ratio of Al, Ti and Si elements is Al / Ti / Si=60 / 30 / 10. The TiAlSiN-AlTiN composite coating is deposited on the surface of the substrate. The prepared coating has a thickness of about 3.5 μm and a microhardness of 24.5 GPa, and has excellent characteristics of high hardness.

[0006] Chinese invention patent CN111500998A discloses an AlTiN / TiAlSiN gradient nanocomposite structure coating and its integrated preparation method and application. The coating is prepared by arc ion plating (Arc), high power pulsed magnetron sputtering (HiPIMS) and its composite (Arc-HiPIMS) deposition technology, and the coating thickness is 0.5-2μm; the Arc-deposited AlTiN base layer is used as a transition layer between the substrate and the coating, and the AlTiN / TiAlSiN sub-nanometer gradient composite structure deposited by the Arc-HiPIMS composite technology is used as an intermediate layer, and the coating thickness is 1-4μm; the top TiAlSiN functional layer is deposited by HiPIMS technology, and the coating thickness is 0.15-2μm. The coating has a dense structure and high bonding strength, which is as high as 80N or more on stainless steel.

[0007] Although the hardness and wear resistance of the cemented carbide coatings in the above-mentioned prior art are improved, the coatings are prepared by a composite process, which is relatively complex and the cost is increased accordingly. The thickness of the coating will also affect the processing life of the cutting tool. If the coating is too thin, it will not play a good role in heat insulation and wear resistance. If the coating is too thick, there will be high internal stress and the coating will easily peel off, which will make the comprehensive performance of the tool poor and greatly increase the production cost. Summary of the invention

[0008] In view of the deficiencies of the above-mentioned prior art, the present invention provides a high-hardness and high-strength cemented carbide coated blade, and the specific technical solution is as follows:

[0009] A high-hardness and high-strength cemented carbide coated blade, comprising a substrate and a coating;

[0010] In terms of weight percentage, the matrix raw material is composed of 89-90% tungsten carbide WC, 6-7% Co, 1-3% tungsten-titanium solid solution ((W, Ti) C), and 1-3% tantalum-niobium solid solution ((Ta, Nb) C);

[0011] The coating comprises an AlTiN base layer, a TiAlSiN functional layer and a TiSiN surface layer; the thickness of the AlTiN base layer is 1.0-1.5 μm, the thickness of the TiAlSiN functional layer is 2.0-3.0 μm and the thickness of the TiSiN surface layer is 0.1-0.5 μm.

[0012] The present invention improves the hardness, high temperature resistance, thermal shock resistance and oxidation resistance of the alloy by adding (W, Ti)C and (Ta, Nb)C solid solvents, prepares a high-hardness, high-strength cemented carbide matrix, achieves a good match between strength and hardness, improves the comprehensive performance of cemented carbide, and can process difficult-to-process materials such as steel, cast iron, and high-temperature alloys. It is an alloy matrix with good versatility. The first AlTiN base layer, the second AlTiSiN functional layer and the third TiSiN surface layer of the coating of the present invention, such as Figure 1 As shown, the three-layer structure of the coating has different hardness, forming a specific gradient composite structure, which reduces the internal defects of the coating, reduces the internal stress of the coating, and thus improves the toughness of the coating, the film-base bonding, and the bonding strength of the coating, ensuring the stability of the coating during the cutting process, thereby increasing the life of the blade, which is conducive to expanding the application field and industrial production scale of the coating; the addition of Al element in the coating improves the high-temperature oxidation resistance of the film layer, and TiN dissolves a large amount of Al element, which can refine the grains and improve the hardness of the coating; in addition, Si element is added to the AlTiN structure to form a nc-TiAlN / α-Si3N4 amorphous composite structure. Amorphous Si3N4, as an interface phase, is mostly filled in the grain boundary area. Dislocations will pass through the amorphous with lower hardness and are blocked by the amorphous Si3N4 phase with higher modulus on the grain boundary. The cracks are blocked and reflected by Si3N4 and deflected, and effectively block the diffusion of oxygen elements into the coating, so that the coating has higher hardness and high-temperature oxidation resistance, increases the toughness of the film layer, and improves the film-base bonding.

[0013] Furthermore, the coating is deposited by arc ion plating technology.

[0014] The present invention adopts arc ion plating deposition technology, has the advantages of fast deposition rate, high bonding strength, uniform and dense prepared coating, high hardness, good matching of coating and cutting blade substrate, and greatly improving the blade life.

[0015] Furthermore, the preparation method of the substrate comprises the following steps:

[0016] (1) adding the raw material powder into a ball mill for grinding according to the formula ratio, adding 1-3 wt% paraffin molding agent, the ball-to-material ratio is 5-7:1, using alcohol as a wet grinding medium, the liquid-to-solid ratio is 1:(1-3), the ball milling time is 30-35 hours, and granulating to obtain a mixed material powder;

[0017] (2) The mixed material powder is pressed into a blade, and the blade is placed in a pressure sintering integrated furnace for sintering. After dewaxing sintering treatment, vacuum sintering treatment, partial pressure sintering treatment and high temperature and high pressure sintering treatment, it is cooled to room temperature to obtain a blade matrix.

[0018] Furthermore, in the step (2), the temperature when the mixed material powder is pressed into blades is 18-24° C., the humidity is 40-50%, and the pressing pressure is 15-25 KN.

[0019] Furthermore, in the step (2), the temperature of the dewaxing sintering treatment is room temperature to 500°C, the time of the dewaxing sintering treatment is 450 to 550 min, the heating rate is 3 to 5°C / min, and the vacuum degree of the dewaxing sintering treatment is 800 to 900 Pa; the temperature of the vacuum sintering treatment is 500 to 1340°C, the vacuum degree of the vacuum sintering treatment is 5 to 15 Pa, the heating rate is 3 to 5°C / min, and the sintering time is 200 to 400 min; the temperature of the partial pressure sintering treatment is 1340 to 1460°C, the vacuum degree of the partial pressure sintering is 900 to 1000 Pa, the heating rate is 3 to 5°C / min, and the sintering time is 100 to 150 min; the temperature of the high temperature and high pressure sintering treatment is 1460 to 1500°C, the pressurization pressure is 3 to 6 MPa, and the insulation time is 20 to 40 min.

[0020] The blade substrate prepared by the present invention is subjected to performance testing, and the bending strength value can reach 3092MPa, and the Vickers hardness value can reach 1593HV 30 , the Hc value can reach 16.74KA / m.

[0021] Furthermore, the method for preparing the coating on the blade substrate comprises the following steps:

[0022] 1) The blade substrate is finely ground, sandblasted, passivated, and then plasma cleaned for 10 to 30 minutes;

[0023] 2) Deposition of coating: The blade substrate is placed in an arc ion plating system and cleaned with Ar plasma for 10 to 30 minutes. The sample holder speed is adjusted to 2 to 4 rpm, and the vacuum chamber temperature is controlled between 500 and 600°C. An AlTiN base layer, a TiAlSiN functional layer and a TiSiN surface layer are sequentially deposited on the substrate.

[0024] Furthermore, in the step 2), the conditions for depositing the AlTiN substrate layer are as follows: the bias voltage is set to 50-100 V, the reaction gas N2 is introduced, the N2 flow rate is adjusted, the vacuum chamber pressure is 1.0-5.0 Pa, and the Al 0.67 Ti 0.33 alloy target, control the target arc current to 50-120A, and start depositing the AlTiN base layer on the substrate, with a deposition time of 45-60min.

[0025] Furthermore, in step 2), the conditions for depositing the TiAlSiN functional layer are as follows: the bias voltage is adjusted to 80-150V, and the Ti 0.85 Si0.15 Alloy target, control target arc current to 80-120A, deposition time to 50-100min.

[0026] Furthermore, in step 2), the condition for depositing the TiSiN surface layer is to close the Al 0.67 Ti 0.33 alloy target, adjust the bias voltage to 80-150V, turn on Ti 0.85 Si 0.15 Alloy target, control the target arc current to 80-120A, and the deposition time to 10-30min.

[0027] The beneficial effects of the present invention are:

[0028] The present invention prepares a high-hardness and high-strength cemented carbide matrix by adding (W, Ti) C and (Ta, Nb) C solid solvents, and then combines arc ion plating technology to deposit a coating with a specific gradient composite structure, thereby reducing internal defects in the coating, reducing internal stress in the coating, improving the toughness of the coating, and the film-base bonding force. The coating is uniform and dense, has high hardness and high-temperature oxidation resistance, and the coating is well matched with the blade matrix, so that the blade life is greatly improved. The process method of the present invention is simple, easy to operate, low in cost, and high in production efficiency. The product has a better cutting service life and can be mass-produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the coating of the present invention;

[0030] From bottom to top, they are cemented carbide substrate, AlTiN base layer, TiAlSiN functional layer, and TiSiN surface layer;

[0031] Figure 2 This is a SEM image of the cemented carbide substrate prepared in Example 1 of the present invention;

[0032] Figure 3 This is a cross-sectional SEM image of the coating prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0033] The principles and features of the present invention are described below in conjunction with embodiments. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0034] Example 1

[0035] A preparation method of a high-hardness and high-strength cemented carbide coated blade comprises the following steps:

[0036] 1. Preparation of the substrate

[0037] (1) According to the corresponding formula ratio, the corresponding raw materials are weighed respectively: WC: 89.5%, Co: 6.5%, (W, Ti) C: 2.0%, (Ta, Nb) C: 2.0%, and the mixed powder is added into a ball mill, and 2 wt% paraffin molding agent is added. The ball-to-material ratio is 6:1, alcohol is used as a wet grinding medium, the liquid-to-solid ratio is 1:2, and the ball milling time is 32 h. The mixed powder is obtained by granulation.

[0038] (2) The mixed powder was pressed into PS21B green compact specimens with a size of 6.50×5.25×20 mm and APMT11T320PDER-M8 blades at a temperature of 20°C, a humidity of 45%, a pressing pressure of 20 KN, a pressing height of 4.8 mm, and a unit weight of 2.40 g. The prepared specimens and blades were placed in a pressure sintering integrated furnace for sintering, and sequentially subjected to dewaxing sintering treatment, vacuum sintering treatment, partial pressure sintering treatment, and high temperature and high pressure sintering treatment. Dewaxing sintering treatment: the temperature is room temperature ~ 500 ° C, the total time of dewaxing sintering treatment is 480min, the heating rate is 4 ° C / min, and the vacuum degree of dewaxing sintering treatment is 870Pa; vacuum sintering treatment: the temperature is 500 ~ 1340 ° C, the vacuum degree of vacuum sintering treatment is 10Pa, the heating rate is 4 ° C / min, and the sintering time is 300min; partial pressure sintering treatment: the temperature is 1340 ~ 1460 ° C, the vacuum degree of partial pressure sintering is 930Pa, the heating rate is 4 ° C / min, and the sintering time is 120min; high temperature and high pressure sintering treatment: the temperature is 1460 ° C, the pressure is 5MPa, and the insulation time is 30min; cool to room temperature with the furnace, and take out the sample strip and the blade substrate.

[0039] (3) The prepared PS21B sample strips and APMT11T320PDER-M8 blade substrate were subjected to performance tests. The sample strips were used to test the bending strength performance, and the blade products were used to test the Vickers hardness and Hc value. The bending strength value was 3092MPa and the Vickers hardness value was 1593HV 30 , Hc value is 16.74KA / m.

[0040] 2. Preparation of coating

[0041] (1) The sintered blade substrate is subjected to coating pretreatment such as fine grinding, sandblasting, passivation, etc., and then subjected to plasma cleaning for 20 minutes.

[0042] (2) Deposition coating: The alloy blade was placed on the sample holder of the INGENIA arc ion plating system and cleaned with Ar plasma for 20 min. The sample holder speed was adjusted to 3 rpm, the vacuum chamber temperature was controlled between 550°C, the bias voltage was set to 50 V, the reaction gas N2 was introduced, the N2 flow rate was adjusted so that the vacuum chamber pressure was 1.0 Pa, and the Al 0.67 Ti0.33 alloy target, control the target arc current to 80A, start to deposit AlTiN base layer on the substrate, the deposition time is 45min, the coating thickness is 1.0μm; adjust the bias voltage to 80V, turn on Ti 0.85 Si 0.15 alloy target, control the target arc current to 80A, deposit TiAlSiN functional layer, deposition time 50min, coating thickness 2.0μm; turn off Al 0.67 Ti 0.33 alloy target, adjust the bias voltage to 80V, control the target arc current to 80A, deposit the TiSiN surface layer, the deposition time is 10min, the coating thickness is 0.1μm, and the total coating thickness is about 3.0μm.

[0043] Example 2

[0044] A preparation method of a high-hardness and high-strength cemented carbide coated blade comprises the following steps:

[0045] 1. Preparation of the substrate

[0046] The preparation method is the same as that in Example 1 and will not be described again here.

[0047] 2. Preparation of coating

[0048] (1) The sintered blade substrate is subjected to coating pretreatment such as fine grinding, sandblasting, passivation, etc., and then subjected to plasma cleaning for 20 minutes.

[0049] (2) Deposition coating: The alloy blade was placed on the sample holder of the INGENIA arc ion plating system and cleaned with Ar plasma for 20 min. The sample holder speed was adjusted to 3 rpm, the vacuum chamber temperature was controlled between 550°C, the bias voltage was set to 80 V, the reaction gas N2 was introduced, the N2 flow rate was adjusted so that the vacuum chamber pressure was 3.0 Pa, and the Al 0.67 Ti 0.33 alloy target, control the target arc current to 100A, start to deposit AlTiN base layer on the substrate, the deposition time is 50min, the coating thickness is 1.2μm; adjust the bias voltage to 100V, turn on Ti 0.85 Si 0.15 alloy target, control the target arc current to 100A, deposit TiAlSiN functional layer, deposition time 80min, coating thickness 2.4μm; turn off Al 0.67 Ti 0.33 alloy target, adjust the bias voltage to 100 V, control the target arc current to 100 A, deposit the TiSiN surface layer, the deposition time is 20 min, the coating thickness is 0.3 μm, and the total coating thickness is about 4.0 μm.

[0050] Example 3

[0051] A preparation method of a high-hardness and high-strength cemented carbide coated blade comprises the following steps:

[0052] 1. Preparation of the substrate

[0053] The preparation method is the same as that in Example 1 and will not be described again here.

[0054] 2. Preparation of coating

[0055] (1) The sintered blade substrate is subjected to coating pretreatment such as fine grinding, sandblasting, passivation, etc., and then subjected to plasma cleaning for 20 minutes.

[0056] (2) Deposition coating: The alloy blade was placed on the sample holder of the INGENIA arc ion plating system and cleaned with Ar plasma for 20 min. The sample holder speed was adjusted to 3 rpm, the vacuum chamber temperature was controlled between 550°C, the bias voltage was set to 100 V, the reaction gas N2 was introduced, the N2 flow rate was adjusted, and the vacuum chamber pressure was 5.0 Pa. The Al 0.67 Ti 0.33 alloy target, control the target arc current to 120A, start to deposit AlTiN base layer on the substrate, the deposition time is 60min, the coating thickness is about 1.5μm; adjust the bias voltage to 150V, turn on Ti 0.85 Si 0.15 alloy target, control the target arc current to 120A, deposit TiAlSiN functional layer, deposition time 100min, coating thickness is about 3.0μm; turn off Al 0.67 Ti 0.33 alloy target, adjusted the bias voltage to 150V, controlled the target arc current to 120A, deposited the TiSiN surface layer, the deposition time was 30min, the coating thickness was about 0.5μm, and the total coating thickness was about 5.0μm.

[0057] Figure 2 This is a microstructure morphology diagram of the cemented carbide substrate prepared in Example 1 of the present invention. It can be seen from the figure that the average size of the WC grains is small, the density is high, there are no obvious pores inside, and there are no abnormally grown grains.

[0058] Figure 3 This is the cross-sectional morphology of the coating prepared in Example 1 of the present invention. As can be seen from the figure, the coating mainly consists of three parts: AlTiN base layer, TiAlSiN functional layer, and TiSiN surface layer. The coating has a dense structure, no holes or cracks, and good bonding between the coating and the substrate.

[0059] The indentation morphology of the cemented carbide coated inserts of Examples 1-3 was tested by the Rockwell hardness indentation method. The microhardness of the coating of Example 1 was 35 GPa, the microhardness of the coating of Example 2 was 32 GPa, and the microhardness of the coating of Example 3 was 30 GPa. The measured bonding strength was HF1 level, indicating that the coating had good bonding strength.

[0060] Carbide coated insert cutting comparison experiment:

[0061] The cutting test was carried out using the blade APMT11T320PDER-M8 prepared by the embodiment of the present invention and the blade ASMT11T320PDPR-MJ of the prior art. The material of the processed product was QT600, and the cutting conditions were: milling: wet cutting; cutting speed Vc=301m / min; feed rate f=0.54mm / r; cutting depth ap=0.15mm; the test results are shown in Table 1.

[0062] Table 1 Cutting performance test results

[0063]

[0064] It can be seen from Table 1 that under the same cutting conditions, the cemented carbide coated inserts prepared by the present invention have a longer service life and better performance under milling than the best-selling comparable commercial product inserts.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-hardness and high-strength cemented carbide coated blade, characterized in that: Including substrate and coating; In terms of weight percentage, the matrix raw material is composed of tungsten carbide WC: 89-90%, Co: 6-7%, tungsten-titanium solid solution: 1-3%, and tantalum-niobium solid solution: 1-3%; The coating comprises an AlTiN base layer, a TiAlSiN functional layer and a TiSiN surface layer; the thickness of the AlTiN base layer is 1.0-1.5 μm.

2. The high-hardness and high-strength cemented carbide coated blade according to claim 1, characterized in that: The thickness of the TiAlSiN functional layer is 2.0-3.0 μm and the thickness of the TiSiN surface layer is 0.1-0.5 μm.

3. The high-hardness and high-strength cemented carbide coated blade according to claim 1, characterized in that: The coating is deposited by using arc ion plating technology.

4. The high-hardness and high-strength cemented carbide coated blade according to claim 1, characterized in that: The preparation method of the substrate comprises the following steps: (1) adding the raw material powder into a ball mill for grinding according to the formula ratio, adding 1-3 wt% paraffin molding agent, the ball-to-material ratio is 5-7:1, using alcohol as a wet grinding medium, the liquid-to-solid ratio is 1:(1-3), the ball milling time is 30-35 hours, and granulating to obtain a mixed material powder; (2) The mixed material powder is pressed into a blade, and the blade is placed in a pressure sintering integrated furnace for sintering. After dewaxing sintering treatment, vacuum sintering treatment, partial pressure sintering treatment and high temperature and high pressure sintering treatment, it is cooled to room temperature to obtain a blade matrix.

5. The high-hardness and high-strength cemented carbide coated blade according to claim 4, characterized in that: In the step (2), the temperature of the dewaxing sintering treatment is room temperature to 500°C, the total time of the dewaxing sintering treatment is 450 to 550 minutes, the heating rate is 3 to 5°C / min, and the vacuum degree of the dewaxing sintering treatment is 800 to 900 Pa; the temperature of the vacuum sintering treatment is 500 to 1340°C, the vacuum degree of the vacuum sintering treatment is 5 to 15 Pa, the heating rate is 3 to 5°C / min, and the sintering time is 200 to 400 minutes; the temperature of the partial pressure sintering treatment is 1340 to 1460°C, the vacuum degree of the partial pressure sintering is 900 to 1000 Pa, the heating rate is 3 to 5°C / min, and the sintering time is 100 to 150 minutes; the temperature of the high temperature and high pressure sintering treatment is 1460 to 1500°C, the pressurization pressure is 3 to 6 MPa, and the insulation time is 20 to 40 minutes.

6. The high-hardness and high-strength cemented carbide coated blade according to claim 3, characterized in that: The method for preparing the coating on the blade substrate comprises the following steps: 1) The blade substrate is finely ground, sandblasted, passivated, and then plasma cleaned for 10 to 30 minutes; 2) Deposition of coating: The blade substrate is placed in an arc ion plating system and cleaned with Ar plasma for 10 to 30 minutes. The sample holder speed is adjusted to 2 to 4 rpm, and the vacuum chamber temperature is controlled between 500 and 600°C. An AlTiN base layer, a TiAlSiN functional layer and a TiSiN surface layer are sequentially deposited on the substrate.

7. The high-hardness and high-strength cemented carbide coated blade according to claim 6, characterized in that: In the step 2), the conditions for depositing the AlTiN substrate layer are as follows: the bias voltage is set to 50-100 V, the reaction gas N2 is introduced, the N2 flow rate is adjusted, the vacuum chamber pressure is 1.0-5.0 Pa, and the AlTiN substrate is deposited. 0.67 Ti 0.33 alloy target, control the target arc current to 50-120A, and start depositing the AlTiN base layer on the substrate, with a deposition time of 45-60min.

8. The high-hardness and high-strength cemented carbide coated blade according to claim 6, characterized in that: In the step 2), the conditions for depositing the TiAlSiN functional layer are as follows: the bias voltage is adjusted to 80-150V, the Ti 0.85 Si 0.15 Alloy target, control target arc current to 80-120A, deposition time to 50-100min.

9. The high-hardness and high-strength cemented carbide coated blade according to claim 6, characterized in that: In the step 2), the condition for depositing the TiSiN surface layer is to close the Al 0.67 Ti 0.33 alloy target, adjust the bias voltage to 80-150V, turn on Ti 0.85 Si 0.15 Alloy target, control the target arc current to 80-120A, and the deposition time to 10-30min.

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