Cutter coating as well as cutting tool and preparation method thereof

Abstract

The invention relates to a cutter coating which is formed by superposing a Tix1Aly1M (1-x1-y1) N layer and a TiCX2Ny2 layer, and M of the Tix1Aly1M (1-x1-y1) N layer is composed of one or more than two of Zr, Hf, Cr, Mo, W, Nb, Ta, Y and Si elements; 1-x1-y1 is equal to 0.002 to 0.1, and y is equal The value range of x1 is from 0.2 to 0.498, and the value range of y1 is from 0.5 to 0.7; according to the TiCX2Ny2 layer, x < 2 > + y < 2 > is equal to 1, and the ratio of x < 2 > to y < 2 > is 1.1-2.2. The Tix1Aly1M (1-x1-y1) N layer and the TiCX2Ny2 are matched and overlapped, so that the Tix1Aly1M (1-x1-y1) N layer has the excellent characteristics of high hardness, high oxidation temperature, good thermal hardness, strong adhesive force, low thermal conductivity and the like.

Description

Technical Field

[0001] This invention belongs to the field of cemented carbide cutting tools, specifically relating to a tool coating, its cutting tool, and its preparation method. Background Art

[0002] A high-hardness coating is formed on the tool surface, thereby increasing the tool's hardness. This effectively resists wear and corrosion during the cutting process, extending tool life. It also reduces cutting forces and the coefficient of friction, minimizing heat and energy loss during cutting. This not only improves cutting efficiency but also reduces thermal deformation and tool wear. Furthermore, the coating enhances cutting surface quality, reducing burrs and scratches during the cutting process.

[0003] Difficult-to-machine materials such as austenitic stainless steel, hardened steel, titanium alloys, high-temperature alloys, and composite materials have always been a challenge in the cutting field. The high hardness, high strength, high plasticity, high toughness, and low thermal conductivity of these materials result in huge cutting forces and high cutting temperatures during the cutting process. At the same time, chip control is difficult, and work hardening is severe, which affects machining efficiency and tool life.

[0004] A search revealed CN202411971861.4, which discloses a CrAlN / TiAlN multilayer tool coating and its preparation method for significantly improving the service life of end mills. First, a Cr target is opened, and the flow ratio of argon and nitrogen is adjusted to deposit a CrN / Cr transition layer. This transition layer significantly enhances the adhesion between the coating and the substrate. After the transition layer is deposited to a thickness of approximately 550-600 nm, the Cr target power is turned off, and the TiAl and CrAl target power is alternately turned on to achieve alternating deposition of TiAlN and CrAlN coatings. The TiAlN coating is deposited on the surface of the transition layer, and the top layer is a CrAlN coating. This CrAlN / TiAlN multilayer tool coating significantly improves the service life and milling quality of end mills while possessing high hardness and high wear resistance.

[0005] CN202310021859.X discloses a multi-structure heterogeneous coating, its preparation method, and its application. The coating comprises a TiAlN underlayer, an AlTiN gradient layer with increasing Al content, an AlTiN / TiSiN nanolayer, and a TiSiN nanocomposite layer sequentially connected. This coating exhibits strong toughness and corrosion resistance, as well as high adhesion. The cutting life of tools coated with this coating is significantly longer than that of traditional AlTiN-coated tools. However, the high hardness of the AlTiN coating still results in significant internal stress, which can negatively impact the tool life in practical applications.

[0006] In metalworking, the adhesion of metal chips to cutting tools can reduce the machining accuracy of the workpiece, result in poor surface finish, and shorten the lifespan of the cutting tools. This is especially important in precision machining, where improving the adhesion resistance of cutting tools is crucial.

[0007] In summary, designing a coated cutting tool suitable for difficult-to-machine materials such as austenitic stainless steel, titanium alloys, high-temperature alloys, and composite materials, especially improving the resistance to melting of stainless steel and other difficult-to-machine materials such as Ti and Ni alloys, has significant market value for production applications. Summary of the Invention

[0008] This invention addresses the shortcomings of existing technologies by providing a tool coating that utilizes Ti x1 Al y1 M (1-x1-y1) N-layers and TiC X2 N y2 Combined with superposition, Ti x1 Al y1 M (1-x1-y1) The N-layer possesses excellent properties such as high hardness, high oxidation temperature, good hot hardness, strong adhesion, and low thermal conductivity, making it particularly suitable for high-speed cutting of high-alloy steel, stainless steel, titanium alloys, nickel alloys, and other materials. Through elemental doping, solid solution strengthening and grain refinement are achieved, conveniently and efficiently improving the cutting performance of coated tools.

[0009] TiC X2 N y2 The coating has high microhardness and a coefficient of friction of about 0.2, which is the lowest among coatings used in practice. It has good friction-reducing properties and can effectively reduce the adhesion of iron filings.

[0010] To achieve the above objectives, the present invention provides the following technical solution: Discloses a tool coating using Ti x1 Al y1 M (1-x1-y1) N-layers and TiC X2 N y2 It is composed of layers, in which Ti x1 Al y1 M (1-x1-y1) The N-layer M is composed of one or more substances selected from Zr, Hf, Cr, Mo, W, Nb, Ta, Y, and Si. This group includes: 1-x1-y1 = 0.002~0.1; x1 ranges from 0.2 to 0.498, and y1 ranges from 0.5 to 0.7; the TiC... X2 N y2 For each layer, x² + y² = 1, and the ratio of x² / y² is 1.1 to 2.2.

[0011] This invention will use Tix1 Al y1 M (1-x1-y1) N-layers and TiC X2 N y2 Layer bonding, through elemental doping, forms solid solution strengthening and grain refinement strengthening, conveniently and efficiently improving the cutting performance of coated tools. Ti x1 Al y1 M (1-x1-y1) Layer N is the main functional layer, TiC X2 N y2 It is an auxiliary functional layer, TiC X2 N y2 TiC does not offer significant advantages in oxidation resistance; therefore, to maximize the overall performance of the coating, the oxidation resistance of TiC must be limited. X2 N y2 The coating thickness.

[0012] Another object of the present invention is to disclose a cutting tool with the above-mentioned tool coating, wherein the tool coating is disposed on a cutting tool substrate and comprises a surface layer and an intermediate layer forming a unit layer, wherein the surface layer is TiC. X2 N y2 Layer, the middle layer is Ti x1 Al y1 M (1-x1-y1) N layers; the total thickness of the unit layer is 1.0µm to 22.0µm, preferably 1.5µm to 15.0µm.

[0013] Furthermore, the blade substrate is coated with a composite tool coating, wherein the Ti x1 Al y1 M (1-x1-y1) The N layer includes Ti x1 Al y1 M (1-x1-y1) N-layer body, first region and second region; the first region is a Ti layer close to the substrate. x1 Al y1 M (1-x1-y1) N layers, the second region is close to TiC X2 N y2 Ti layer x1 Al y1 M (1-x1-y1) The N-layer has a higher Al content in the second region than in the third region. The functional layers gradually increase the Al content from the substrate outwards, resulting in more Al2O3 being generated in the outer layers. This ensures the coating's wear resistance while effectively improving its high-temperature oxidation resistance. The content of low-melting-point Al in the coating can be gradually increased by gradually decreasing the N2 flow rate or gradually increasing the power during coating. For magnetron sputtering, conical aluminum inserts can also be designed to achieve a gradient increase in Al content.

[0014] Furthermore, the Tix1 Al y1 M (1-x1-y1) The Al content of the N-layer body is between 50% and 70%, with the Al content in the first region exceeding 50% and the Al content in the second region less than 70%. Higher Al content promotes Al₂O₃ formation, but excessive Al can lead to the formation of the h-AlN phase, reducing the coating's wear resistance. Conversely, insufficient Al content reduces Al₂O₃ formation, thus decreasing the coating's oxidation resistance. Maintaining an Al content of 50% to 70%, and gradually increasing the Al content from the inside out, more effectively ensures good overall performance.

[0015] Furthermore, the Ti x1 Al y1 M (1-x1-y1) The orientation of the N layer has an I(200) / I(111) strength ratio greater than 1. This design ensures better wear resistance.

[0016] Furthermore, TiC X2 N y2 The coating thickness is 0.5~2.5μm, which is less than that of Ti. x1 Al y1 M (1-x1-y1) N-layer thickness. Ensures good wear resistance and lubrication performance.

[0017] Furthermore, the blade substrate contains a cemented carbide of tungsten carbide and cobalt.

[0018] Furthermore, in the unit layer, the proportion of W and Co elements gradually decreases as the W element is further away from the blade substrate. Under certain conditions, the W and Co components of the cemented carbide substrate diffuse into the coating, ensuring the bonding between the coating and the substrate.

[0019] Another object of the present invention is to disclose a method for preparing the above-mentioned cutting tool, characterized by comprising the following steps: S1. Clean the blade surface, heat to 150℃~200℃ and vacuum process, vacuum degree 2×10 -2 Pa~3×10 -2 Pa, deeply removes impurities; S2. Heat to 500℃~550℃, argon flow rate 800sccm~1000sccm, set blade bias voltage 200V~300V, and perform plasma activation treatment on the blade for 20min~30min; S3. Maintaining a constant temperature, introduce nitrogen gas at a flow rate of 2000 sccm~3500 sccm and a pressure of 1 Pa~10 Pa, and prepare the target metal targets. Ionize the metal targets (the metal source) by evaporation through arc discharge. React the ionized targets with nitrogen gas (the nitrogen source) and deposit them onto the blade surface. This forms a Ti layer with a gradient of Al content. x1 Al y1 M (1-x1-y1) N layers; S4. Keep the temperature constant, argon flow rate 800sccm~1000sccm, set the blade bias voltage 200V~300V, and perform plasma activation treatment on the blade to promote the adhesion of subsequent coatings. The time is 20min~30min. S5. Maintain a constant temperature and introduce nitrogen gas at a flow rate of 35 sccm~75 sccm, and methane at a flow rate of 25 sccm~65 sccm. Using a Ti metal target, the target, acting as a metal source, is evaporated and ionized via arc discharge. The ionized target reacts with methane (carbon source) and nitrogen gas (nitrogen source), and is then deposited onto the blade surface. Using a pure metal Ti target, the pressure is set to 5 Pa~20 Pa, the discharge current to 100 A~200 A, the bias voltage to 30 V~80 V, and the PVD deposition time to 35 min~60 min to form TiC. X2 N y2 layer.

[0020] Compared with the prior art, the advantages of this invention are: Existing technology effectively reduces the adhesion of metal chips to cutting tools, improves workpiece machining accuracy, prevents poor workpiece surface finish, and extends cutting tool life. This significantly improves product quality and achieves cost reduction and efficiency improvement. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the cutting tool structure of the tool coating described in this invention.

[0022] Figure 2 For Ti x1 Al y1 M (1-x1-y1) Test diagram of orientation of layer N. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings. The drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0024] The tool coating of this invention uses Tix1Aly1M. (1-x1-y1) N-layers and TiC X2 N y2 It is composed of layers, among which, Tix1Aly1M (1-x1-y1) The N-layer M is composed of one or more substances selected from Zr, Hf, Cr, Mo, W, Nb, Ta, Y, and Si; 1-x1-y1=0.002~0.1; x1 ranges from 0.2 to 0.498, and y1 ranges from 0.5 to 0.7; the TiC X2 N y2 For each layer, x² + y² = 1, and the ratio of x² / y² is 1.1 to 2.2.

[0025] The tool coating is applied to the tool substrate and consists of a surface layer and an intermediate layer forming a composite unit layer. The surface layer is TiC. X2 N y2 The middle layer is Ti x1 Al y1 M (1-x1-y1) N layers; the total thickness of the unit layer is 1.0µm~22.0µm.

[0026] The specific preparation method is as follows. Example 1

[0027] The cutting tool with the tool coating in this embodiment uses the tool coatings in Table 1. The tool substrate is coated with a composite tool coating, Ti. x1 Al y1 M (1-x1-y1) The N layer includes Ti x1 Al y1 M (1-x1-y1) N-layer body, first region and second region; the first region is Ti close to the substrate. x1 Al y1 M (1-x1-y1) At layer N, the second region is close to TiC. X2 N y2 Ti layer x1 Al y1 M (1-x1-y1) At layer N; the Al content in the second region is higher than the Al content in the first region. In this embodiment, Ti x1 Al y1 M (1-x1-y1) The Al content of the N-layer body is 55%, the Al content of the first region is greater than 51%, and the Al content of the second region is 60%.

[0028] The cutting tool substrate in this embodiment contains tungsten carbide and cobalt cemented carbide, specifically model WNMG080408-MA. Its surface and intermediate layers form a composite unit layer, as shown in Table 1. Within the unit layer, the content of W and Co elements gradually decreases as the W element is further away from the cutting tool substrate. Specifically, this embodiment uses M30 cemented carbide, formulated with 10% Co, 0.8% (W, Ta)C, and 89.2% WC. After ball milling, spray granulation, molding, and sintering, the processed material is used for coating.

[0029] A method for preparing a coating for cutting tools includes the following steps: S1. Clean the blade surface, heat to 150℃ and vacuum process, vacuum degree 2×10 -2 Pa, deeply removes impurities; S2. Heat to 500℃, argon flow rate 1000sccm, set blade bias voltage 200V, and perform plasma activation treatment on the blade for 30min; S3. Maintain a constant temperature, introduce nitrogen gas at a flow rate of 2000 sccm, and gradually reduce it to 2000 sccm during the coating process (to create a gradient of Al content). Set the pressure to 10 Pa and prepare the appropriate metal target. Ionize the metal target (the metal source) by arc discharge. React the ionized target with nitrogen gas (the nitrogen source) and deposit it onto the blade surface. This forms a Ti coating with a gradient of Al content. x1 Al y1 M (1-x1-y1) N layers; S4. Keep the temperature constant, argon flow rate 800 sccm, set the blade bias voltage to 300V, and perform plasma activation treatment on the blade to promote the adhesion of subsequent coatings. The time is 30 minutes. S5. Maintain a constant temperature, introduce nitrogen gas at a flow rate of 35 sccm and methane at 25 sccm; use a Ti metal target and ionize the target (metal source) by arc discharge, etc.; react the ionized target with methane (carbon source) and nitrogen gas (nitrogen source), and deposit it onto the blade surface; use a pure metal Ti target, set the pressure to 5 Pa, discharge current to 100 A, bias voltage to 30 V, and PVD deposition time to 60 min; TiC can be formed. X2 N y2 layer.

[0030] A schematic diagram of the coating in this embodiment is shown below. Figure 1 Ti x1 Al y1 M (1-x1-y1) The orientation of layer N is such that the intensity ratio of I(200) / I(111) is greater than 1, and the test results are shown in [link to test results]. Figure 2 . Example 2

[0031] The cutting tool with the tool coating in this embodiment uses the tool coatings in Table 1. The tool substrate is coated with a composite tool coating, Ti. x1 Al y1 M (1-x1-y1) The N layer includes Ti x1 Al y1 M (1-x1-y1) N-layer body, first region and second region; the first region is Ti close to the substrate. x1 Al y1 M (1-x1-y1) At layer N, the second region is close to TiC. X2 N y2 Ti layer x1 Al y1 M (1-x1-y1) At layer N; the Al content in the second region is higher than the Al content in the first region. In this embodiment, Ti x1 Al y1 M (1-x1-y1) The Al content of the N-layer body is 66%, the Al content of the first region is 62%, and the Al content of the second region is 68%.

[0032] The cutting tool substrate in this embodiment contains tungsten carbide and cobalt cemented carbide, specifically model WNMG080408-MA. Its surface and intermediate layers form a composite unit layer, as shown in Table 1. Within the unit layer, the content of W and Co elements gradually decreases as the W element is further away from the cutting tool substrate. Specifically, this embodiment uses M30 cemented carbide, formulated with 10% Co, 0.8% (W, Ta)C, and 89.2% WC. After ball milling, spray granulation, molding, and sintering, the processed material is used for coating.

[0033] A method for preparing a coating for cutting tools includes the following steps: S1. Clean the blade surface, heat to 200℃ and vacuum process, vacuum degree 3×10 -2 Pa, deeply removes impurities; S2. Heat to 550℃, argon flow rate 800sccm, set blade bias voltage 300V, and perform plasma activation treatment on the blade for 20min; S3. Maintain a constant temperature, introduce nitrogen gas at a flow rate of 3500 sccm, gradually reducing it to 2000 sccm during the coating process, and set the pressure to 3.1 Pa. Prepare the appropriate metal target material. Ionize the metal target (the metal source) by evaporation through arc discharge. React the ionized target with nitrogen gas (the nitrogen source) and deposit it onto the blade surface. This forms a Ti coating with a gradient of Al content. x1 Al y1 M (1-x1-y1) N layers; S4. Keep the temperature constant, argon flow rate 1000 sccm, set the blade bias voltage to 200V, and perform plasma activation treatment on the blade to promote the adhesion of subsequent coatings. The time is 20 minutes. S5. Maintain a constant temperature, introduce nitrogen gas at a flow rate of 75 sccm and methane at 65 sccm; use a Ti metal target and ionize the target (metal source) by arc discharge, etc.; react the ionized target with methane (carbon source) and nitrogen gas (nitrogen source), and deposit it onto the blade surface; use a pure metal Ti target, set the pressure to 20 Pa, discharge current to 200 A, bias voltage to 80 V, and PVD deposition time to 35 min; TiC can be formed. X2 N y2 layer. Example 3

[0034] The cutting tool with the tool coating in this embodiment uses the tool coatings in Table 1. The tool substrate is coated with a composite tool coating, Ti. x1 Al y1 M (1-x1-y1) The N layer includes Ti x1 Al y1 M (1-x1-y1) N-layer body, first region and second region; the first region is Ti close to the substrate. x1 Al y1 M (1-x1-y1) At layer N, the second region is close to TiC. X2 N y2 Ti layer x1 Al y1 M (1-x1-y1) At layer N; the Al content in the second region is higher than the Al content in the first region. In this embodiment, Ti x1 Al y1 M (1-x1-y1) The Al content of the N-layer body is 63%, the Al content of the first region is 60%, and the Al content of the second region is 65%.

[0035] The cutting tool substrate in this embodiment contains tungsten carbide and cobalt cemented carbide, specifically model WNMG080408-MA. Its surface and intermediate layers form a composite unit layer, as shown in Table 1. Within the unit layer, the proportion of W and Co elements gradually decreases as the W element is further away from the cutting tool substrate. Specifically, this embodiment uses M30 cemented carbide, formulated with 10% Co, 0.8% (W, Ta)C, and 89.2% WC. After ball milling, spray granulation, molding, and sintering, it is processed for coating and future use.

[0036] The method for preparing a cutting tool includes the following steps: S1. The blade surface is cleaned, heated to 180℃, and vacuum treated to a vacuum degree of 2.5×10⁻⁶. -2 Pa, deeply removes impurities; S2. Heat to 520℃, argon flow rate 900sccm, set blade bias voltage 250V, and perform plasma activation treatment on the blade for 25min; S3. Maintain a constant temperature, introduce nitrogen gas at a flow rate of 3200 sccm, gradually reducing it to 2000 sccm during the coating process, and set the pressure to 5 Pa. Prepare the appropriate metal target material. Ionize the metal target (the metal source) by evaporation through arc discharge. React the ionized target with nitrogen gas (the nitrogen source) and deposit it onto the blade surface. This forms a Ti coating with a gradient of Al content. x1 Al y1 M (1-x1-y1) N layers; S4. Keep the temperature constant, argon flow rate 1000 sccm, set the blade bias voltage to 200V, and perform plasma activation treatment on the blade to promote the adhesion of subsequent coatings. The time is 25 min. S5. Maintain a constant temperature, introduce nitrogen gas at a flow rate of 50 sccm and methane at 40 sccm; use a Ti metal target and ionize the target (metal source) by arc discharge; react the ionized target with methane (carbon source) and nitrogen gas (nitrogen source), and deposit it onto the blade surface; use a pure metal Ti target, set the pressure to 10 Pa, discharge current to 150 A, bias voltage to 50 V, and PVD deposition time to 45 min; TiC can be formed. X2 N y2 layer. Example 4

[0037] Its coating uses the tool coatings in Table 1, and the tool substrate is coated with a composite tool coating, Ti x1 Al y1 M (1-x1-y1) The N layer includes Ti x1 Al y1 M (1-x1-y1) N-layer body, first region and second region; the first region is Ti close to the substrate. x1 Al y1 M (1-x1-y1) At layer N, the second region is close to TiC. X2 N y2 Ti layer x1 Al y1 M (1-x1-y1) At layer N; the Al content in the second region is higher than the Al content in the first region. In this embodiment, Ti x1 Al y1 M (1-x1-y1)The Al content of the N-layer body is 51.5%, the Al content of the first region is 51%, and the Al content of the second region is 53%. The preparation method is the same as in Example 3. Example 5

[0038] Its coating uses the tool coatings in Table 1, and the tool substrate is coated with a composite tool coating, Ti x1 Al y1 M (1-x1-y1) The N layer includes Ti x1 Al y1 M (1-x1-y1) N-layer body, first region and second region; the first region is Ti close to the substrate. x1 Al y1 M (1-x1-y1) At layer N, the second region is close to TiC. X2 N y2 Ti layer x1 Al y1 M (1-x1-y1) At layer N; the Al content in the second region is higher than the Al content in the first region. In this embodiment, Ti x1 Al y1 M (1-x1-y1) The Al content of the N-layer body is 56%, the Al content of the first region is 55%, and the Al content of the second region is 58%. Its preparation method is the same as in Example 3. Its preparation method is the same as in Example 1.

[0039] Examples 6-9 Its coating uses the tool coatings in Table 1, and the tool substrate is coated with a composite tool coating, Ti x1 Al y1 M (1-x1-y1) The N layer includes Ti x1 Al y1 M (1-x1-y1) N-layer body, first region and second region; the first region is Ti close to the substrate. x1 Al y1 M (1-x1-y1) At layer N, the second region is close to TiC. X2 N y2 Ti layer x1 Al y1 M (1-x1-y1) At layer N; the Al content in the second region is higher than the Al content in the first region. In this embodiment, Ti x1 Al y1 M (1-x1-y1) The Al content of the N-layer body is 65%, the Al content of the first region is 60%, and the Al content of the second region is 68%. Its preparation method is the same as in Example 3. Its preparation method is the same as in Example 1.

[0040] Comparative Examples 1-4 The coating used is the tool coating from Table 1, and its preparation method is the same as in Example 2. No surface structure is present in Comparative Example 1. In Comparative Example 2, the surface layer thickness is greater than the intermediate layer thickness. In Comparative Example 3, the total thickness of the unit layer is greater than 22 μm. In Comparative Example 4, the surface layer thickness is equal to the intermediate layer thickness.

[0041]

[0042] The above-described embodiments and comparative samples were prepared and their performance tested under the following specific experimental conditions.

[0043] Equipment used: Hunan Qianhe Technology Co., Ltd. Horizontal CNC lathe T5.2-500S Performance test experimental conditions 1: Workpiece: Material SUS304 (Φ200×230mm) CNC insert: WNMG080408-MA / Base material M30 Linear velocity (Vc): 160m / min Depth of cut (ap): 1.0mm Feed rate (f): 0.35 mm / r Other: wet (cutting fluid) Judgment method: Process for 30 minutes and observe the chip accumulation at the tool tip and the gloss of the workpiece.

[0044] Performance test experimental conditions 2: Workpiece: Material 42CrMo (Φ200×230mm, with 4 x 10mm wide grooves) CNC insert: WNMG080408-MA / Base material M30 Linear velocity (Vc): 140m / min Depth of cut (ap): 1.0mm Feed rate (f): 0.35 mm / r Other: wet (cutting fluid) Judgment method: The number of impacts until the tool tip breaks (there are 4 impacts per cut) is OK (normal) if it is greater than 1400, and NG (poor impact resistance) if it is less than 1400. The test results are shown in Table 2.

[0045] In summary, the TiCN coating applied to the cutting tools of Examples 1 to 9 improved their resistance to melting and extended their service life when machining SUS304 stainless steel. It also improved the surface finish of the workpiece, achieving precision machining. Tools without surface treatment failed to achieve a satisfactory workpiece surface finish. Furthermore, excessively thick coatings were prone to chipping, and excessively high carbon content in the surface layer caused the coating to lose toughness, leading to tool tip breakage.

[0046] The above are merely embodiments of the present invention, and the invention is not limited to the fields covered by this embodiment. Commonly known structures and characteristics in the solutions are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the scope of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A tool coating, characterized in that, Using Tix1Aly1M (1-x1-y1) N-layers and TiC X2 N y2 It is composed of layers, among which, Tix1Aly1M (1-x1-y1) The N-layer M is composed of one or more substances selected from Zr, Hf, Cr, Mo, W, Nb, Ta, Y, and Si; 1-x1-y1=0.002~0.1; x1 ranges from 0.2 to 0.498, and y1 ranges from 0.5 to 0.7; the TiC X2 N y2 For each layer, x² + y² = 1, and the ratio of x² / y² is 1.1 to 2.

2.

2. A cutting tool comprising the tool coating of claim 1, characterized in that, The tool coating is applied to the tool substrate and comprises a surface layer and an intermediate layer forming a composite unit layer. The surface layer is TiC. X2 N y2 The middle layer is Ti x1 Al y1 M (1-x1-y1) N layers; the total thickness of the unit layer is 1.0µm~22.0µm.

3. The cutting tool with the tool coating according to claim 2, characterized in that, The blade substrate is coated with a composite tool coating, the Ti x1 Al y1 M (1-x1-y1) The N layer includes Ti x1 Al y1 M (1-x1-y1) N-layer body, first region and second region; the first region is a Ti layer close to the substrate. x1 Al y1 M (1-x1-y1) At layer N, the second region is close to TiC. X2 N y2 Ti layer x1 Al y1 M (1-x1-y1) At layer N, the Al content in the second region is higher than that in the first region.

4. The cutting tool according to claim 3, characterized in that, The Ti x1 Al y1 M (1-x1-y1) The Al content of the N-layer body is between 50% and 70%, with the Al content of the first region being greater than 50% and the Al content of the second region being less than 70%.

5. The cutting tool according to claim 4, characterized in that, The Ti x1 Al y1 M (1-x1-y1) The orientation of the N layer is such that the intensity ratio of I(200) / I(111) is greater than 1.

6. The cutting tool with the tool coating according to claim 3, characterized in that, TiC X2 N y2 The coating thickness is 0.5~2.5μm, which is less than that of Ti. x1 Al y1 M (1-x1-y1) N layers thickness.

7. The cutting tool with the tool coating according to any one of claims 2-6, characterized in that, The blade substrate contains a cemented carbide of tungsten carbide and cobalt.

8. The cutting tool according to claim 7, characterized in that, In the unit layer, the proportion of Co element gradually decreases as the W element is further away from the blade substrate.

9. A method for preparing the cutting tool according to claim 8, characterized in that, Includes the following steps: S1. Clean the blade surface, heat to 150℃~200℃ and vacuum process, vacuum degree 2×10 -2 Pa~3×10 -2 Pa, deeply removes impurities; S2. Heat to 500℃~550℃, argon flow rate 800sccm~1000sccm, set blade bias voltage 200V~300V, and perform plasma activation treatment on the blade for 20min~30min; S3. Maintaining a constant temperature, introduce nitrogen gas at a flow rate of 2000 sccm~3500 sccm and a pressure of 1 Pa~10 Pa, and prepare the target metal targets. Ionize the metal targets (the metal source) by evaporation through arc discharge. React the ionized targets with nitrogen gas (the nitrogen source) and deposit them onto the blade surface. This forms a Ti layer with a gradient of Al content. x1 Al y1 M (1-x1-y1) N layers; S4. Keep the temperature constant, argon flow rate 800sccm~1000sccm, set the blade bias voltage 200V~300V, and perform plasma activation treatment on the blade to promote the adhesion of subsequent coatings. The time is 20min~30min. S5. Maintain a constant temperature, introduce nitrogen gas at a flow rate of 35 sccm~75 sccm, and methane at a flow rate of 25 sccm~65 sccm; use a Ti metal target and ionize the target (as the metal source) by arc discharge, etc.; react the ionized target with methane (as the carbon source) and nitrogen gas (as the nitrogen source), and deposit it onto the blade surface; use a pure metal Ti target, set the pressure to 5 Pa~20 Pa, the discharge current to 100 A~200 A, the bias voltage to 30 V~80 V, and the PVD deposition time to 35 min~60 min; TiC can be formed. X2 N y2 layer.

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