Wear-resistant cemented carbide and method for producing the same

Abstract

The application relates to the field of hard alloy materials, in particular to a wear-resistant hard alloy and a preparation method thereof, which is composed of a hard alloy base body, a transition layer and a wear-resistant coating layer, the transition layer is made of a rare earth-iron binary alloy and LaMO3, M is a transition metal element, the gradient structure of the thermal expansion coefficient can be formed by adding the transition layer, the thermal stress distribution between the layers is more uniform, the stress concentration phenomenon is reduced, the bonding strength between the wear-resistant coating layer and the hard alloy base body is improved, and the service life is prolonged.

Description

Technical Field

[0001] This invention relates to the field of cemented carbide materials, specifically to a wear-resistant cemented carbide and its preparation method. Background Technology

[0002] With the rapid development of dry high-performance cutting technology, cutting tools need to withstand higher temperatures and faster cutting speeds during the machining process. Especially when cutting difficult-to-machine materials such as high-temperature alloys, a violent chemical reaction will occur at the cutting edge of the tool, resulting in severe wear on the workpiece surface and a shortened tool life.

[0003] Applying a wear-resistant coating to the surface of cemented carbide can improve the wear resistance and extend the service life of cutting tools to a certain extent. TiN coatings, due to their high wear resistance and chemical stability, are widely used in the field of tool coatings. However, their application is mainly under low temperature and simple operating conditions. When the cutting temperature exceeds 500℃, TiN coatings will experience severe oxidative wear, eventually leading to coating peeling. TiAlN coatings, obtained by doping with Al, are metastable solutions formed by Al atoms replacing some Ti atoms in TiN. Furthermore, TiAlN coated tools can form a dense alumina protective film on the surface, maintaining good cutting performance even at operating temperatures exceeding 800℃.

[0004] However, both TiN and TiAIN coatings have significantly different coefficients of thermal expansion with cemented carbide, resulting in insufficient interfacial adhesion. During high-speed cutting, the coating is prone to peeling off from the substrate. How to improve the bonding strength between the coating and the substrate has become a research hotspot for those skilled in the art. Summary of the Invention

[0005] Purpose of the invention: In view of the above-mentioned technical problems, the present invention proposes a wear-resistant cemented carbide and its preparation method.

[0006] The technical solution adopted is as follows:

[0007] A wear-resistant cemented carbide comprises a cemented carbide matrix, a transition layer, and a wear-resistant coating:

[0008] The transition layer is made of rare earth-iron binary alloy and LaMO3, where M is a transition metal element.

[0009] Furthermore, the mass ratio of the rare earth-iron binary alloy to the rare earth oxide is 1-5:1-5.

[0010] Furthermore, the rare earth-iron binary alloy is TbFe2 and / or DyFe2.

[0011] Furthermore, M is Ni 3+ Co 3+ or Cr3+ .

[0012] Furthermore, the wear-resistant coating is a TiAlN coating.

[0013] Furthermore, the TiAlN coating is obtained by depositing a titanium-aluminum alloy target in a mixed atmosphere of nitrogen and silane.

[0014] Furthermore, the silane is a product in which one or more carbon atoms selected from methane, ethane, propane, butane, pentane, or hexane are replaced by silicon atoms.

[0015] Furthermore, the silane is n-butylsilane (CAS NO: 1600-29-9).

[0016] This invention also provides a method for preparing wear-resistant cemented carbide:

[0017] After grinding, polishing, cleaning and drying, the cemented carbide substrate is mixed evenly with rare earth-iron binary alloy and LaMO3 and then laser cladding technology is used to form a transition layer on the surface of the cemented carbide substrate. Subsequently, a TiAlN coating is deposited on the transition layer in a mixed atmosphere of nitrogen and silane.

[0018] Furthermore, the process parameters for laser cladding are as follows:

[0019] The laser power is 3-5kW, the scanning speed is 200-400mm / min, the spot diameter is 1-5mm, and argon gas protection is used with an argon gas flow rate of 1-10L / min.

[0020] Furthermore, the flow rate ratio of nitrogen to silane is 40-50:1.

[0021] It has the following beneficial effects:

[0022] The difference in the coefficients of thermal expansion between the cemented carbide and the wear-resistant coating is a key factor affecting the interfacial bonding performance and service life of the coating. During the cooling process after deposition or high-temperature service, the wear-resistant coating shrinks more significantly, leading to tensile and compressive residual stresses at the interface. These stresses can cause coating peeling and shorten service life. Adding a transition layer can create a gradient structure of thermal expansion coefficients, resulting in a more uniform distribution of thermal stress between layers. This reduces stress concentration, improves the bonding strength between the wear-resistant coating and the cemented carbide substrate, and extends service life.

[0023] This invention provides a wear-resistant cemented carbide. The high-temperature stability and oxygen vacancy characteristics of LaMO3 can promote chemical bonding and offset the internal stress of the coating through compressive stress. The transition layer made by combining LaMO3 with a rare earth-iron binary alloy with a low coefficient of thermal expansion can effectively alleviate the difference in the coefficient of thermal expansion between the wear-resistant coating and the cemented carbide substrate, and improve the bonding force at the interface between the two. Moreover, the rare earth-iron binary alloy promotes interfacial wettability through high surface energy and enhances physical bonding. At the same time, rare earth elements have high activity and can form strong chemical bonds with the cemented carbide substrate, and at the same time undergo partial diffusion reactions with elements in the wear-resistant coating, improving the interfacial bonding performance.

[0024] When silane is introduced during TiAlN coating deposition, the silicon generated from silane decomposition forms amorphous Si3N4 within the TiAlN coating. This not only increases grain boundaries between different phases but also provides internal resistance within the coating, promoting grain isolation, preventing dislocation formation, and reducing grain movement, thereby increasing the coating's hardness. During high-speed friction, the amorphous Si3N4 reacts with moisture in the air to generate SiO2·nH2O, which has lubricating properties and can also reduce the coating's friction coefficient, improving wear resistance. Carbon from silane decomposition replaces some nitrogen atoms in the TiAlN unit cell to form TiAlCN solid solution, increasing coating hardness. Furthermore, carbon's lubricating properties also contribute to reducing the coating's friction coefficient and extending its service life. However, the above information is a reasonable inference based on performance test results and existing research; there may be imperfections or omissions, requiring further investigation. Attached Figure Description

[0025] Figure 1 The image shows the cross-sectional morphology of the wear-resistant cemented carbide prepared in Example 1. Detailed Implementation

[0026] Unless otherwise specified in the examples, the conditions were performed under standard conditions or as recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all commercially available products. Techniques not mentioned in this invention refer to existing technologies. Unless otherwise specified, the following examples and comparative examples are parallel experiments, using the same processing steps and parameters.

[0027] Example 1:

[0028] This embodiment provides a wear-resistant cemented carbide, which consists of a cemented carbide matrix, a transition layer, and a wear-resistant coating. See the cross-sectional morphology diagram below. Figure 1 :

[0029] The transition layer is made of DyFe2 alloy and LaNiO3 in a mass ratio of 1:1, and the wear-resistant coating is a TiAlN coating.

[0030] The preparation method of the above-mentioned wear-resistant cemented carbide is as follows:

[0031] A cemented carbide with a Co content of 12 wt.% and a WC grain size of 1.6 μm was used as the substrate. After grinding, polishing, and alcohol cleaning, the cemented carbide substrate was dried with hot air. A 1:1 mass ratio of DyFe2 alloy and LaNiO3 was mixed uniformly and laser cladding technology was used to form a transition layer with a thickness of 1.5 ± 0.1 μm on the surface of the cemented carbide substrate. The laser cladding process parameters were: laser power 4 kW, scanning speed 300 mm / min, spot diameter 3 mm, argon protection, and argon flow rate of 5 L / min. Subsequently, the cemented carbide substrate was placed in the chamber of a cathode arc evaporation device. Ti33Al67 alloy was used as the target material, and nitrogen and n-butylsilane with a flow rate ratio of 45:1 were used as the working gas. The deposition temperature was 700℃ and the target current was 180 A, the bias voltage was 40 V, the pressure was 3.2 Pa, and the deposition temperature was 240 min to obtain a TiAlN coating.

[0032] Example 2:

[0033] This embodiment provides a wear-resistant cemented carbide, which consists of a cemented carbide matrix, a transition layer, and a wear-resistant coating:

[0034] The transition layer is made of DyFe2 alloy and LaNiO3 in a mass ratio of 1:1, and the wear-resistant coating is a TiAlN coating.

[0035] The preparation method of the above-mentioned wear-resistant cemented carbide is as follows:

[0036] A cemented carbide with a Co content of 12 wt.% and a WC grain size of 1.6 μm was used as the substrate. After grinding, polishing, and alcohol cleaning, the cemented carbide substrate was dried with hot air. A 1:1 mass ratio of DyFe2 alloy and LaNiO3 was mixed uniformly and laser cladding technology was used to form a transition layer with a thickness of 1.5 ± 0.1 μm on the surface of the cemented carbide substrate. The laser cladding process parameters were: laser power 4 kW, scanning speed 300 mm / min, spot diameter 3 mm, argon protection, and argon flow rate of 5 L / min. Subsequently, the cemented carbide substrate was placed in the chamber of a cathode arc evaporation device. Ti33Al67 alloy was used as the target material, nitrogen was used as the working gas, and a TiAlN coating was obtained by deposition at a target current of 180 A, a bias voltage of 40 V, a pressure of 3.2 Pa, and a deposition temperature of 700 °C for 240 min.

[0037] The difference between Example 2 and Example 1 is that n-butylsilane was not introduced during the deposition of the TiAlN coating. This led to a decrease in the wear-resistant properties of the cemented carbide. The reason may be that the introduction of n-butylsilane during TiAlN coating deposition resulted in silicon elements forming amorphous Si3N4 in the TiAlN coating. This not only increases the grain boundaries between different phases, but also provides internal resistance within the coating, promoting grain isolation, preventing dislocation formation, and reducing grain movement, thereby increasing the coating's hardness. During high-speed friction, the amorphous Si3N4 reacts with moisture in the air to generate SiO2·nH2O, which has a lubricating effect and can also reduce the coating's friction coefficient, improving wear resistance. The carbon elements from silane decomposition replace some nitrogen atoms in the TiAlN unit cell to form TiAlCN solid solution, increasing the coating's hardness. Furthermore, the lubricating effect of carbon also helps reduce the coating's friction coefficient and extend its service life.

[0038] Example 3:

[0039] This embodiment provides a wear-resistant cemented carbide, which consists of a cemented carbide matrix, a transition layer, and a wear-resistant coating:

[0040] The transition layer is made of DyFe2 alloy and LaNiO3 in a mass ratio of 5:1, and the wear-resistant coating is a TiAlN coating.

[0041] The preparation method of the above-mentioned wear-resistant cemented carbide is as follows:

[0042] A cemented carbide with a Co content of 12 wt.% and a WC grain size of 1.6 μm was used as the substrate. After grinding, polishing, and alcohol cleaning, the cemented carbide substrate was dried with hot air. A DyFe2 alloy and LaNiO3 were mixed evenly in a mass ratio of 5:1 and laser cladding was used to form a transition layer with a thickness of 1.5 ± 0.1 μm on the surface of the cemented carbide substrate. The laser cladding process parameters were: laser power 5 kW, scanning speed 400 mm / min, spot diameter 5 mm, argon protection, and argon flow rate of 10 L / min. Subsequently, the cemented carbide substrate was placed in the chamber of a cathode arc evaporation device. Ti33Al67 alloy was used as the target material, and nitrogen and n-butylsilane in a flow ratio of 50:1 were used as the working gas. The deposition temperature was 700 °C and the target current was 180 A, the bias voltage was 40 V, the pressure was 3.2 Pa, and the deposition temperature was 240 min to obtain a TiAlN coating.

[0043] The difference between Example 3 and Example 1 is that the mass ratio of DyFe2 alloy and LaNiO3 is different. It is possible that changing the ratio of the two will affect the construction of the thermal expansion gradient system of the wear-resistant cemented carbide, thereby affecting the performance of the wear-resistant cemented carbide.

[0044] Example 4:

[0045] This embodiment provides a wear-resistant cemented carbide, which consists of a cemented carbide matrix, a transition layer, and a wear-resistant coating:

[0046] The transition layer is made of DyFe2 alloy and LaNiO3 in a mass ratio of 1:5, and the wear-resistant coating is a TiAlN coating.

[0047] The preparation method of the above-mentioned wear-resistant cemented carbide is as follows:

[0048] A cemented carbide with a Co content of 12 wt.% and a WC grain size of 1.6 μm was used as the substrate. After grinding, polishing, and alcohol cleaning, the cemented carbide substrate was dried with hot air. A 1.5 ± 0.1 μm thick transition layer was formed on the surface of the cemented carbide substrate by uniformly mixing DyFe2 alloy and LaNiO3 in a mass ratio of 1:5. The laser cladding process parameters were: laser power 3 kW, scanning speed 200 mm / min, spot diameter 1 mm, argon protection, and argon flow rate 1 L / min. Subsequently, the cemented carbide substrate was placed in the chamber of a cathode arc evaporation device. Ti33Al67 alloy was used as the target material, and nitrogen and n-butylsilane in a flow ratio of 40:1 were used as the working gas. The TiAlN coating was obtained by deposition for 240 min at a target current of 180 A, a bias voltage of 40 V, a pressure of 3.2 Pa, and a deposition temperature of 700 °C.

[0049] The difference between Example 4 and Example 1 is that the mass ratio of DyFe2 alloy and LaNiO3 is different. It is possible that changing the ratio of the two will affect the construction of the thermal expansion gradient system of the wear-resistant cemented carbide, thereby affecting the performance of the wear-resistant cemented carbide.

[0050] Example 5:

[0051] This embodiment provides a wear-resistant cemented carbide, which consists of a cemented carbide matrix, a transition layer, and a wear-resistant coating:

[0052] The transition layer is made of TbFe2 alloy and LaNiO3 in a mass ratio of 1:1, and the wear-resistant coating is a TiAlN coating.

[0053] The preparation method of the above-mentioned wear-resistant cemented carbide is as follows:

[0054] A cemented carbide with a Co content of 12 wt.% and a WC grain size of 1.6 μm was used as the substrate. After grinding, polishing, and alcohol cleaning, the cemented carbide substrate was dried with hot air. A 1:1 mass ratio of TbFe2 alloy and LaNiO3 was mixed uniformly and laser cladding technology was used to form a transition layer with a thickness of 1.5 ± 0.1 μm on the surface of the cemented carbide substrate. The laser cladding process parameters were: laser power 4 kW, scanning speed 300 mm / min, spot diameter 3 mm, argon protection, and argon flow rate of 5 L / min. Subsequently, the cemented carbide substrate was placed in the chamber of a cathode arc evaporation device. Ti33Al67 alloy was used as the target material, and nitrogen and n-butylsilane with a flow rate ratio of 45:1 were used as the working gas. The deposition temperature was 700 °C and the target current was 180 A, the bias voltage was 40 V, the pressure was 3.2 Pa, and the deposition temperature was 240 min to obtain a TiAlN coating.

[0055] The difference between Example 5 and Example 1 is that TbFe2 alloy is used instead of DyFe2 alloy. This may affect the construction of the thermal expansion gradient system of the wear-resistant cemented carbide, thereby affecting the performance of the wear-resistant cemented carbide. It may also be due to the difference in activity of different rare earth elements, which may lead to changes in the performance of the wear-resistant cemented carbide.

[0056] Example 6:

[0057] This embodiment provides a wear-resistant cemented carbide, which consists of a cemented carbide matrix, a transition layer, and a wear-resistant coating:

[0058] The transition layer is made of DyFe2 alloy and LaCoO3 in a mass ratio of 1:1, and the wear-resistant coating is a TiAlN coating.

[0059] The preparation method of the above-mentioned wear-resistant cemented carbide is as follows:

[0060] A cemented carbide with a Co content of 12 wt.% and a WC grain size of 1.6 μm was used as the substrate. After grinding, polishing, and alcohol cleaning, the cemented carbide substrate was dried with hot air. A 1:1 mass ratio of DyFe2 alloy and LaCoO3 was mixed uniformly and laser cladding technology was used to form a transition layer with a thickness of 1.5 ± 0.1 μm on the surface of the cemented carbide substrate. The laser cladding process parameters were: laser power 4 kW, scanning speed 300 mm / min, spot diameter 3 mm, argon protection, and argon flow rate of 5 L / min. Subsequently, the cemented carbide substrate was placed in the chamber of a cathode arc evaporation device. Ti33Al67 alloy was used as the target material, and nitrogen and n-butylsilane with a flow rate ratio of 45:1 were used as the working gas. The deposition temperature was 700℃ and the target current was 180 A, the bias voltage was 40 V, the pressure was 3.2 Pa, and the deposition temperature was 240 min to obtain a TiAlN coating.

[0061] The difference between Example 6 and Example 1 is that LaCoO3 is used instead of LaNiO3. This may affect the construction of the thermal expansion gradient system of the wear-resistant cemented carbide, thereby affecting the performance of the wear-resistant cemented carbide. It may also be due to the difference in activity of different transition metal elements, which may lead to changes in the performance of the wear-resistant cemented carbide.

[0062] Example 7:

[0063] This embodiment provides a wear-resistant cemented carbide, which consists of a cemented carbide matrix, a transition layer, and a wear-resistant coating:

[0064] The transition layer is made of DyFe2 alloy and LaCrO3 in a mass ratio of 1:1, and the wear-resistant coating is a TiAlN coating.

[0065] The preparation method of the above-mentioned wear-resistant cemented carbide is as follows:

[0066] A cemented carbide with a Co content of 12 wt.% and a WC grain size of 1.6 μm was used as the substrate. After grinding, polishing, and alcohol cleaning, the cemented carbide substrate was dried with hot air. A 1:1 mass ratio of DyFe2 alloy and LaCrO3 was mixed uniformly and laser cladding technology was used to form a transition layer with a thickness of 1.5 ± 0.1 μm on the surface of the cemented carbide substrate. The laser cladding process parameters were: laser power 4 kW, scanning speed 300 mm / min, spot diameter 3 mm, argon protection, and argon flow rate of 5 L / min. Subsequently, the cemented carbide substrate was placed in the chamber of a cathode arc evaporation device. Ti33Al67 alloy was used as the target material, and nitrogen and n-butylsilane with a flow rate ratio of 45:1 were used as the working gas. The deposition temperature was 700℃ and the target current was 180 A, the bias voltage was 40 V, the pressure was 3.2 Pa, and the deposition temperature was 240 min to obtain a TiAlN coating.

[0067] The difference between Example 7 and Example 1 is that LaCrO3 is used instead of LaNiO3. This may affect the construction of the thermal expansion gradient system of the wear-resistant cemented carbide, thereby affecting the performance of the wear-resistant cemented carbide. It may also be due to the difference in activity of different transition metal elements, which may lead to changes in the performance of the wear-resistant cemented carbide.

[0068] Comparative Example 1:

[0069] It is basically the same as Example 1, except that it does not contain a transition layer;

[0070] This comparative example provides a wear-resistant cemented carbide, consisting of a cemented carbide matrix and a wear-resistant coating:

[0071] The wear-resistant coating is a TiAlN coating.

[0072] The preparation method of the above-mentioned wear-resistant cemented carbide is as follows:

[0073] A cemented carbide with a Co content of 12 wt.% and a WC grain size of 1.6 μm was used as the substrate. After grinding, polishing, and alcohol cleaning, the cemented carbide substrate was dried with hot air. The cemented carbide substrate was placed in the chamber of a cathode arc evaporation device. Ti33Al67 alloy was used as the target material, and nitrogen and n-butylsilane with a flow ratio of 45:1 were used as the working gas. The TiAlN coating was obtained by deposition for 240 min at a target current of 180 A, a bias voltage of 40 V, a pressure of 3.2 Pa, and a deposition temperature of 700 °C.

[0074] Because there is no transition layer, the difference in the coefficient of thermal expansion between the cemented carbide and the wear-resistant coating affects the interfacial bonding performance and service life of the coating. During the cooling process after the deposition of the wear-resistant coating or after high-temperature service, the wear-resistant coating shrinks more, resulting in tensile and compressive residual stress at the interface, which leads to the deterioration of the wear-resistant cemented carbide performance.

[0075] Comparative Example 2:

[0076] This is essentially the same as Example 1, except that the transition layer does not contain LaNiO. 3；

[0077] This comparative example provides a wear-resistant cemented carbide, which consists of a cemented carbide matrix, a transition layer, and a wear-resistant coating:

[0078] The transition layer is made of DyFe2 alloy, and the wear-resistant coating is a TiAlN coating.

[0079] The preparation method of the above-mentioned wear-resistant cemented carbide is as follows:

[0080] A cemented carbide with a Co content of 12 wt.% and a WC grain size of 1.6 μm was used as the substrate. After grinding, polishing, and alcohol cleaning, the cemented carbide substrate was dried with hot air. A transition layer with a thickness of 1.5 ± 0.1 μm was formed on the surface of the cemented carbide substrate using DyFe2 alloy laser cladding technology. The laser cladding process parameters were: laser power 4 kW, scanning speed 300 mm / min, spot diameter 3 mm, argon protection, and argon flow rate of 5 L / min. Subsequently, the cemented carbide substrate was placed in the chamber of a cathode arc evaporation device. Ti33Al67 alloy was used as the target material, and nitrogen and n-butylsilane with a flow ratio of 45:1 were used as the working gas. The TiAlN coating was obtained by deposition for 240 min at a target current of 180 A, a bias voltage of 40 V, a pressure of 3.2 Pa, and a deposition temperature of 700 °C.

[0081] Since the transition layer does not contain LaNiO3, a thermal expansion gradient system cannot be constructed, resulting in a decrease in the wear-resistant properties of the cemented carbide.

[0082] Comparative Example 3:

[0083] The example is basically the same as in Example 1, except that the DyFe2 alloy is replaced with Fe-36Ni Invar alloy.

[0084] Although Fe-36Ni Invar alloy also has a low coefficient of thermal expansion and can form a thermal expansion gradient system with LaNiO3, it lacks highly active rare earth elements, which leads to a decrease in the wear-resistant properties of the cemented carbide.

[0085] Performance testing:

[0086] The wear-resistant cemented carbides prepared in Examples 1-7 and Comparative Examples 1-3 of this invention were used as samples for performance testing.

[0087] The bonding strength between the coating and the cemented carbide substrate was determined using a WS-500 automatic adhesion scratch tester. A normal pressure of 0-140 N was uniformly applied to the coating surface using a diamond scratch tester. Large fluctuations and sharp increases in the coefficient of friction and acoustic signal during the scratch test were related to the exposure of the substrate after coating failure. Therefore, the bonding strength between the coating and the substrate can be obtained by combining the acoustic signal, coefficient of friction, and normal loading force.

[0088] The sliding friction test of the sample coating was carried out at room temperature. GCr15 was used to test the friction and wear of the grinding ball on the Rtec MFT-5000 friction and wear tester. The load was 5N, the wear radius was 3mm, the rotation speed was 180r / min, and the wear time was 30min.

[0089] The test results are shown in Table 1 below:

[0090]

[0091] As shown in Table 1 above, the wear-resistant cemented carbide prepared by the method of the present invention has excellent wear resistance and hardness, and the TiAlN coating has high hardness and high bonding strength with the cemented carbide substrate.

[0092] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wear resistant cemented carbide, characterized in that, consisting of a cemented carbide substrate, a transition layer and a wear resistant coating layer: The transition layer is made of a rare earth-iron binary alloy and LaMO3, M being Ni 3+ , Co 3+ or Cr 3+ ; the mass ratio of the rare earth-iron binary alloy and the rare earth oxide is 1-5:1-5; the rare earth-iron binary alloy is TbFe2 and / or DyFe2; the wear resistant coating layer is a TiAlN coating layer; the TiAlN coating layer is deposited by a titanium-aluminum alloy target in a mixed atmosphere consisting of nitrogen and silane.

2. The wear resistant cemented carbide according to claim 1, wherein the silane is any one of methane, ethane, propane, butane, pentane or hexane, or a product after two or more carbon atoms are replaced by silicon atoms.

3. A method of producing a wear resistant cemented carbide according to claim 2, c h a r a c t e r i s e d in that After the cemented carbide substrate is polished, polished and cleaned, it is dried, the rare earth-iron binary alloy and LaMO3 are mixed uniformly, and then a transition layer is formed on the surface of the cemented carbide substrate by laser cladding technology, and then a TiAlN coating layer is deposited on the transition layer in a mixed atmosphere consisting of nitrogen and silane.

4. The method of producing a wear resistant cemented carbide according to claim 3, wherein The process parameters of laser cladding are as follows: laser power 3-5kW, scanning speed 200-400mm / min, spot diameter 1-5mm, argon protection, argon flow rate 1-10L / min.

5. The method of producing a wear resistant cemented carbide according to claim 3, wherein The flow rate ratio of nitrogen and silane is 40-50:1.

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