Surface coated cutting tools with preferred texture orientation and method of making and use thereof

Abstract

This invention discloses a surface-coated cutting tool with a preferred texture orientation, its preparation method, and its application. The surface-coated cutting tool includes a tool substrate and a surface coating disposed on the tool substrate. At least one layer of the surface coating is an α-Al₂O₃ coating. The α-Al₂O₃ coating has a preferred texture orientation relative to the {1010} and {0012} crystal planes, and the texture coefficient satisfies the following characteristics: 5.0 ≤ TC(1010) + TC(0012) < 9.0, and 3.0 ≤ TC(1010) < 9.0, 0 < TC(0012) < 4.0. The preparation method includes depositing the coatings on the tool substrate using a CVD process. The surface-coated cutting tool of this invention possesses both excellent wear resistance and anti-chipping properties, exhibiting superior performance in the machining of materials such as cast iron, stainless steel, and alloy steel.

Description

Technical Field

[0001] This invention belongs to the field of coated cutting tool technology, specifically relating to a surface-coated cutting tool with preferred texture orientation, its preparation method, and its application. Background Technology

[0002] With high-speed and dry cutting becoming the mainstream, the rapid development of coating technology plays a key role in improving tool performance and advancing cutting technology. Coated cutting tools have become an important symbol of modern cutting tools.

[0003] Al2O3 coatings possess high chemical stability and excellent thermal barrier properties, making them ideal coating materials for high-speed cutting tools. Three different phases can be obtained by CVD deposition of Al2O3 coatings: α-Al2O3, κ-Al2O3, and γ-Al2O3, with α-Al2O3 being the only stable Al2O3 phase. Considering both coating preparation technology and wear resistance, the α-Al2O3 phase is the best and safest choice for use as a wear-resistant material and cutting tool coating. CVD α-Al2O3 coatings are also currently the most widely used surface coating for cutting tools.

[0004] It has been found that coatings with specific preferred grain orientations exhibit different properties in PVD and CVD coatings, and demonstrate superior performance for different processing conditions. Coating technologies with specific preferred grain orientations have attracted great interest and attention from coating researchers.

[0005] US Patent document US5654035 discloses an alumina coating with a (012) texture orientation, but its performance is insufficient under high wear resistance conditions. Chinese Patent document CN105714268B discloses an alumina coating with a texture orientation of TC(0012)≥7.2, which is mainly used in high wear resistance conditions. For α-Al2O3, the (0012) crystal plane is its close-packed plane, and the strong (0012) texture makes cracks easy to propagate along the grain boundaries, which greatly limits its plastic deformation ability, resulting in insufficient performance under high speed and high efficiency conditions. For CVD α-Al2O3 coatings, the texture orientation is mainly affected by the transition layer and the deposition parameters during the nucleation and growth of the α-Al2O3 coating. For CVD MT-TiCN / Al2O3 coatings, the transition layer structure and composition are complex, and the mechanism by which changes in structure and composition affect the growth and texture orientation of α-Al2O3 coatings remains unclear, making the control of new texture orientations in CVD α-Al2O3 coatings exceptionally difficult. Furthermore, existing technologies still have performance limitations for high-efficiency, high-speed machining processes such as steel and cast iron. With further research, different growth texture orientations can be adopted for different machining conditions to achieve better processing performance. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a surface-coated cutting tool with a preferred texture orientation that has excellent wear resistance and anti-chipping properties, and also has excellent wear resistance and anti-plastic deformation properties in high-speed and high-efficiency machining of cast iron, steel and other materials, as well as its preparation method and application.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0008] A surface-coated cutting tool with a preferred texture orientation includes a tool substrate and a surface coating disposed on the tool substrate. At least one layer of the surface coating is an α-Al2O3 coating. The α-Al2O3 coating has a preferred texture orientation relative to the {1010} and {0012} planes of the crystal, and the texture coefficient satisfies the following characteristics: 5.0≤TC(1010)+TC(0012)<9.0, and 3.0≤TC(1010)<9.0, 0<TC(0012)<4.0.

[0009] The surface-coated cutting tool with the above-mentioned preferred texture orientation preferably has 3.0≤TC(1010)<8.0 and 1.0<TC(0012)<4.0.

[0010] Preferably, in the aforementioned surface-coated cutting tools with preferred texture orientation, the texture coefficient of the surface coating is represented by TC(hkl), which is defined as follows:

[0011] in, I(hkl) = (hkl) is the measured intensity of the reflected light. I0(hkl) = Standard intensity of reflection based on the standard powder diffraction data (hkl) of the applied JCPDF card No. 10-0173. n represents the number of reflections used in the calculation; n=9. (hkl) i The (hkl) used i The reflective crystal planes are (012), (104), (110), (113), (116), (214), (300), (1010) and (0012).

[0012] Preferably, in the aforementioned surface-coated cutting tool with preferred texture orientation, a central Ti compound layer is provided between the tool substrate and the α-Al2O3 coating, and a BL layer is provided between the central Ti compound layer and the α-Al2O3 coating.

[0013] Preferably, in the aforementioned surface-coated cutting tool with preferred texture orientation, the BL layer comprises a TiCN layer, a (TiAl)(CNO) layer, and an oxide layer arranged sequentially from bottom to top.

[0014] Preferably, in the above-mentioned surface-coated cutting tool with preferred texture orientation, the average thickness of the BL layer is 0.115 μm to 2.25 μm, the average thickness of the TiCN layer is 0.1 μm to 2.0 μm, the average thickness of the (TiAl)(CNO) layer is 0.01 μm to 0.2 μm, and the average thickness of the oxide layer is 0.005 μm to 0.05 μm.

[0015] Preferably, in the aforementioned surface-coated cutting tool with preferred texture orientation, a bottom Ti compound layer is provided between the tool substrate and the central Ti compound layer.

[0016] Preferably, in the aforementioned surface-coated cutting tool with preferred texture orientation, the middle Ti compound layer is composed of Ti compound, and the average thickness of the middle Ti compound layer is 0.1 μm to 18 μm; the bottom Ti compound layer is a TiN layer, and the average thickness of the bottom Ti compound layer is 0.1 μm to 2.0 μm.

[0017] Preferably, in the above-mentioned surface-coated cutting tool with preferred texture orientation, the α-Al2O3 coating has a surface Ti compound layer, the surface Ti compound layer is a TiN layer, and the average thickness of the surface Ti compound layer is 0.1μm to 3μm.

[0018] Preferably, the surface coating of the aforementioned surface-coated cutting tool with preferred texture orientation has a total thickness of 2 μm to 35 μm.

[0019] Preferably, in the above-mentioned surface-coated cutting tool with preferred texture orientation, the microstructure of the α-Al2O3 coating is a fibrous columnar structure. The average width of the columnar grains at 50% of the thickness along the growth direction of the α-Al2O3 coating on a cross section perpendicular to the α-Al2O3 coating is set as d, and the thickness of the α-Al2O3 coating is set as h. The ratio of h to d is h / d≥10.

[0020] As a general technical concept, the present invention also provides a method for preparing the above-mentioned surface-coated cutting tool with preferred texture orientation, comprising the following steps: A surface coating is deposited on the tool substrate, wherein at least one layer of the surface coating is an α-Al₂O₃ coating. The α-Al₂O₃ coating is deposited using a CVD process, and the deposition conditions are as follows: deposition temperature 980℃~1010℃, deposition pressure 4kPa~20kPa, and initial introduction of 1.5vol%~6.5vol% AlCl₃ gas, 0.5vol%~5.0vol% CO₂ gas, 0.5vol%~6.0vol% CO gas, and 0.3vol%~1. A deposition process involving 5 vol% HCl gas and the remainder H2 was initiated, with a deposition time of 15 to 75 minutes. Subsequently, a mixture of 2.0 vol% to 8.0 vol% AlCl3 gas, 1.0 vol% to 5.0 vol% CO2 gas, 1.0 vol% to 10.0 vol% CO gas, 0.2 vol% to 1.0 vol% H2S gas, 0.3 vol% to 2.2 vol% HCl gas, and the remainder H2 gas was introduced. The volume fraction V of CO2 in the reintroduced deposition gas was... CO2 Volume fraction V of AlCl3 AlCl3 The ratio V CO2 / V AlCl3 The volume fraction V of H2S is 0.3–0.9. H2S V, the ratio of the volume fractions of CO2 and CO to the sum of their volume fractions H2S / (V CO2 +V CO The concentration of the precipitate was 0.05–0.20, and the deposition time was 30 min–1000 min.

[0021] In the preferred embodiment of the above-mentioned method for preparing a surface-coated cutting tool with a preferred texture orientation, a central Ti compound layer is provided between the tool substrate and the α-Al2O3 coating. The central Ti compound layer is deposited using a CVD process, and the deposition conditions are: deposition temperature 810℃~950℃, deposition pressure 4kPa~50kPa, and the composition of the deposition gas is 2.1vol%~13.0vol% TiCl4 gas, 35.0vol%~61.5vol% N2 gas, 0.4vol%~1.2vol% CH3CN gas, 0.3vol%~1.5vol% HCl gas, and the balance being H2 gas.

[0022] In the above-mentioned method for preparing a surface-coated cutting tool with preferred texture orientation, preferably, a BL layer is provided between the central Ti compound layer and the α-Al2O3 coating. The BL layer includes a TiCN layer, a (TiAl)(CNO) layer and an oxide layer arranged sequentially from bottom to top. The TiCN layer, the (TiAl)(CNO) layer and the oxide layer are all deposited using a CVD process, and the deposition process is carried out in a coating furnace with two gas inlets. The deposition conditions for the TiCN layer are as follows: deposition temperature 900℃~1010℃, deposition pressure 0.5kPa~4kPa, and two gas streams are used to load the coating furnace. The first gas stream, Q1, consists of 2.0 vol%~13.0 vol% TiCl4 gas, 5.0 vol%~25.0 vol% N2 gas, 0.7 vol%~5.0 vol% CH4 gas, and the balance being H2 gas. The second gas stream, Q2, consists of 0.5 vol%~2.0 vol% NH3 gas and the balance being H2 gas. The volume ratio of the first gas stream, Q1, to the second gas stream, Q2 is 1.1~5.0, and the volume fraction of N2, V... N2 Volume fraction V of NH3 NH3 Ratio V N2 / V NH3 The volume fraction V of CH4 is 10–50. CH4 The ratio V to the total volume fraction of nitrogen-containing gas CH4 / (V N2 +V NH3 The volume fraction V of TiCl4 is 0.05–0.50. TiCl4 Volume fraction V of NH3 NH3 The ratio V TiCl4 / V NH3 The value ranges from 5.0 to 45. The deposition conditions for the (TiAl)(CNO) layer are as follows: deposition temperature 950℃~1010℃, deposition pressure 0.8kPa~4kPa, and two gas streams are used to load the coating furnace. The first gas stream, P1, consists of 2.0 vol%~15.0 vol% TiCl4 gas, 0.5 vol%~5.5 vol% AlCl3 gas, 1.2 vol%~3.0 vol% oxygen-containing gas, 8.0 vol%~20.0 vol% N2, and the balance H2. The oxygen-containing gas is composed of CO2 and CO or only CO. The volume fraction V of CO2 in the first gas stream, P1, is... CO2 Volume fraction of CO V CO The ratio satisfies the condition 0 ≤ V CO2 / V CO ≤0.6, the composition of the second gas mixture P2 is 0.5 vol% to 2.0 vol% NH3 and the balance H2; in the two gas mixtures, the volume ratio of the first gas mixture P1 to the second gas mixture P2 is 1.0 to 5.0, and the volume fraction of N2 is V N2 Volume fraction V of NH3 NH3 The ratio V N2 / V NH3 The volume fraction V of TiCl4 gas is 15–62. TiCl4Volume fraction V of NH3 gas NH3 The ratio V TiCl4 / V NH3 The value ranges from 6.0 to 35.0. The deposition process conditions for the oxide layer are as follows: deposition temperature of 950℃~1010℃, deposition pressure of 1kPa~7kPa, and deposition using a single reactive gas stream. First, 2.0 vol%~11.0 vol% TiCl4 gas, 1.5 vol%~5.5 vol% AlCl3 gas, and the balance H2 are introduced for a deposition time of 1 min~10 min. Then, 1.5 vol%~4.0 vol% CO2 gas, 3.0 vol%~11.0 vol% CO gas, and the balance H2 are introduced. The volume fraction V of CO gas in the subsequently introduced deposition gas is... CO Volume fraction of CO2 gas V CO2 The ratio V CO / V CO2 The pH ranges from 1.2 to 3.5, and the deposition time is from 1 to 10 minutes.

[0023] In the above-mentioned method for preparing a surface-coated cutting tool with preferred texture orientation, preferably, a bottom Ti compound layer is provided between the tool substrate and the middle Ti compound layer. The bottom Ti compound layer is deposited using a CVD process, and the deposition process conditions are: deposition temperature 810℃~950℃, deposition pressure 4kPa~50kPa, and the composition of the deposition gas is 2.1vol%~13.0vol% TiCl4 gas, 32.0vol%~50.5vol% N2, and the balance H2.

[0024] In the above-mentioned method for preparing a surface-coated cutting tool with preferred texture orientation, preferably, a surface Ti compound layer is provided on the α-Al2O3 coating. The surface Ti compound layer is deposited using a CVD process, and the deposition process conditions are: deposition temperature 950℃~1010℃, deposition pressure 50kPa~65kPa, and the composition of the deposition gas is 2.5vol%~13.0vol% TiCl4 gas, 32.0vol%~65.0vol% N2, and the balance H2.

[0025] As a general technical concept, the present invention also provides the application of the above-mentioned surface-coated cutting tool with preferred texture orientation or the surface-coated cutting tool with preferred texture orientation prepared by the above-mentioned preparation method in the field of machining cast iron, stainless steel or alloy steel materials.

[0026] The coating of this invention can be used on substrates made of steel tools, hard materials (including cemented carbide, cermet and non-metallic ceramics, etc.), cubic boron nitride and other superhard materials.

[0027] In this invention, the surface Ti compound layer can be used simultaneously with the α-Al2O3 coating, the BL layer, the bottom Ti compound layer, and the middle Ti compound layer to obtain superior performance. At the same time, the surface Ti compound layer in this invention can also serve as a surface coloring layer to achieve better appearance and usability.

[0028] Compared with the prior art, the advantages of the present invention are as follows: 1. The α-Al2O3 coating of the present invention achieves the deposition of an α-Al2O3 coating with a columnar crystal structure and preferred crystal growth orientation on the surface of a cutting tool by controlling the texture orientation and grain structure, and has 5.0≤TC(1010)+TC(0012)<9.0, 3.0≤TC(1010)<9.0, and 0<TC(0012)<4.0.

[0029] The wear-resistant coating of the present invention obtains a BL layer with strong bonding performance through N source and process optimization control, which effectively improves the interfacial bonding performance between the α-Al2O3 coating and the TiCN layer, and achieves excellent comprehensive performance under high-speed and high-efficiency conditions through synergy with the α-Al2O3 coating with preferred crystal growth orientation.

[0030] The wear-resistant coating of the present invention achieves the control of the {1010} and {0012} crystal texture orientation of the α-Al2O3 coating through the optimized control of the BL layer and the regulation of the deposition parameters of the α-Al2O3 coating. Through the optimal combination and synergy of crystal growth orientation, the cutting tool of the present invention has both excellent wear resistance and resistance to plastic deformation.

[0031] 2. The preparation method of the present invention achieves the control of the performance of the transition layer of the composite coating and the texture orientation of the α-Al2O3 coating by using a low-pressure process and NH3, which effectively solves the problem of insufficient performance of existing coatings under high-speed and high-efficiency working conditions of materials such as cast iron and steel. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the coated cutting tool T1 in Embodiment 1 of the present invention.

[0033] Figure 2 The image shows the XRD diffraction pattern of the coated cutting tool T1 in Embodiment 1 of the present invention.

[0034] Figure 3 This is a SEM image of the coated cutting tool T1 in Embodiment 1 of the present invention.

[0035] Legend: 1. Tool substrate; 2. Surface coating; 3. Bottom Ti compound layer; 4. Middle Ti compound layer; 5. BL layer; 51. TiCN layer; 52. (TiAl)(CNO) layer; 53. Oxide layer; 6. α-Al2O3 coating; 7. Surface Ti compound layer. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention. All materials and instruments used in the following embodiments are commercially available.

[0037] Examples 1-8 The surface-coated cutting tools T1-T8 of the present invention with preferred texture orientation, such as Figure 1 As shown, the tool substrate 1 and a surface coating 2 disposed on the tool substrate 1 are included. The surface coating 2 has a total thickness of 2 μm to 35 μm. The surface coating 2 includes at least an α-Al2O3 coating 6. The α-Al2O3 coating 6 has a preferred texture orientation relative to the {1010} and {0012} planes of the crystal. The texture coefficient satisfies the following characteristics: 5.0≤TC(1010)+TC(0012)<9.0, and 3.0≤TC(1010)<9.0, 0<TC(0012)<4.0.

[0038] TC(hkl) is defined as follows:

[0039] in, I(hkl) = (hkl) is the measured intensity of the reflected light. I0(hkl) = Standard intensity of reflection based on the standard powder diffraction data (hkl) of the applied JCPDF card No. 10-0173. n represents the number of reflections used in the calculation; n=9. (hkl) i The (hkl) used i The reflective crystal planes are: (012), (104), (110), (113), (116), (214), (300), (1010) and (0012).

[0040] In this embodiment, a central Ti compound layer 4 is provided between the tool substrate 1 and the α-Al2O3 coating 6, and a BL layer 5 is provided between the central Ti compound layer 4 and the α-Al2O3 coating 6.

[0041] In this embodiment, the BL layer 5 is composed of multiple layers. According to the order of coating deposition, the BL layer 5 includes a TiCN layer 51, a (TiAl)(CNO) layer 52 and an oxide layer 53 arranged from bottom to top.

[0042] In this embodiment, a bottom Ti compound layer 3 is provided between the tool substrate 1 and the middle Ti compound layer 4.

[0043] In this embodiment, the middle Ti compound layer 4 is composed of Ti compounds, and the bottom Ti compound layer 3 is a TiN layer.

[0044] In this embodiment, the α-Al2O3 coating 6 is provided with a surface Ti compound layer 7, which is a TiN layer.

[0045] That is, in this embodiment, the coatings on the surface of the tool substrate 1 from bottom to top are, in sequence, a bottom Ti compound layer 3, a middle Ti compound layer 4, a BL layer 5, an α-Al2O3 coating 6, and a surface Ti compound layer 7. The coatings in the BL layer 5 from bottom to top are, in sequence, a TiCN layer 51, a (TiAl)(CNO) layer 52, and an oxide layer 53.

[0046] In this embodiment, the microstructure of the α-Al2O3 coating 6 is a fibrous columnar structure. The average width of the columnar crystal grains at 50% of the thickness along the growth direction of the α-Al2O3 coating 6 on a cross section perpendicular to the α-Al2O3 coating 6 is set as d, and the thickness of the α-Al2O3 coating 6 is set as h. The ratio of h to d is h / d≥10.

[0047] In this embodiment, the average thickness of the bottom Ti compound layer 3 is 0.5 μm to 2.0 μm, the average thickness of the middle Ti compound layer 4 is 7 μm to 12 μm, the average thickness of the BL layer 5 is 0.5 μm to 2 μm, the average thickness of the TiCN layer 51 is 0.7 μm to 1.8 μm, the average thickness of the (TiAl)(CNO) layer 52 is 0.03 μm to 0.20 μm, the average thickness of the oxide layer 53 is 0.005 μm to 0.025 μm, the average thickness of the α-Al2O3 coating 6 is 5.0 μm to 9.0 μm, and the average thickness of the surface Ti compound layer 7 is 0.5 μm to 3.0 μm.

[0048] In this embodiment, the tool substrate 1 is a cemented carbide substrate, but it is not limited to this. It can also be a substrate made of superhard materials such as cermet, ceramic, steel or cubic boron nitride.

[0049] In this embodiment, the thickness of each layer of the surface-coated cutting tools T1-T8 is shown in Table 1.

[0050] Table 1. Average thickness of each layer of surface-coated cutting tools T1-T8

[0051] In this embodiment, the texture coefficient of the α-Al2O3 coating 6 of the surface-coated cutting tools T1-T8 is shown in Table 2.

[0052] Table 2 Texture coefficient of α-Al2O3 coating 6 in surface-coated cutting tools T1-T8

[0053] The method for preparing surface-coated cutting tools T1-T8 with preferred texture orientation according to the present invention includes the following steps: S1. Preparation of Tool Matrix 1: A mixture of powders containing 9% Co, 2.5% TaNbC, 0.35% Cr3C2, and the balance WC with a particle size of 1.5-1.8 μm is pressed, sintered, and ground to produce a WC-Co cemented carbide matrix with the blade shape specified in ISO standard WNMG080408. Tools T1, T2, T3, T4, T5, T6, T7, and T8 use the same tool matrix, groove shape, and preparation method.

[0054] To prepare indexable coated cutting inserts, a hot-wall coating furnace with two air inlets is used for surface coating deposition, such as the Bernex BPX530L CVD coating equipment.

[0055] S2. Deposition of the bottom Ti compound layer 3: A bottom Ti compound layer 3, with TiN composition, is deposited on the tool substrate 1 using a CVD process. The bottom Ti compound layer 3 is deposited in a hot-wall coating furnace with two gas inlets, through one reactive gas inlet. The deposition conditions are shown in Table 3.

[0056] Table 3. Deposition parameters of the bottom Ti compound layer 3

[0057] S3, Deposition of the middle Ti compound layer 4: Adjust the 1-channel reactive gas and use the 1-channel reactive gas to deposit the middle Ti compound layer 4 on the bottom Ti compound layer 3. The deposition conditions are shown in Table 4.

[0058] Table 4. Deposition parameters of Ti compound layer 4 in the middle.

[0059] S4. Deposition of BL Layer 5: TiCN layer 51, (TiAl)(CNO) layer 52, and oxide layer 53 are sequentially deposited on the central Ti compound layer 4 to form BL layer 5. Specifically, two reactive gas streams are used to deposit the lower TiCN layer 51, with deposition conditions shown in Table 5; two reactive gas streams are used to deposit the central (TiAl)(CNO) layer 52, with deposition conditions shown in Table 6; and one reactive gas stream is used to deposit the upper oxide layer 53, with deposition conditions shown in Table 7. When using two reactive gas streams, the two streams are kept separate and mixed before entering the preheater of the coating furnace. The mixture is then deposited in the CVD reactor through a hollow graphite rod with perforated edges connected to the preheater.

[0060] Table 5. Deposition parameters of TiCN layer 51 below BL layer.

[0061] Table 6. Deposition parameters of layer 52 in the middle of layer BL (TiAl)(CNO).

[0062] Table 7 Deposition parameters of oxide layer 53 above BL layer

[0063] S5. Deposit α-Al2O3 coating 6: Deposit α-Al2O3 coating 6 on the surface of BL layer 5 (i.e. the surface of the upper oxide layer 53 of BL layer), and the deposition conditions are shown in Tables 8 and 9.

[0064] Table 8. First-step deposition parameters for α-Al2O3 coating 6

[0065] Table 9. Second-step deposition parameters for α-Al₂O₃ coating 6

[0066] Under the limited deposition process conditions, the thickness of the α-Al2O3 coating 6 is highly correlated with the deposition time, and the coating thickness can be controlled by adjusting the α-Al2O3 deposition time.

[0067] S6. Deposit surface Ti compound layer 7: Continue to deposit surface Ti compound layer 7 on the tool surface, and the deposition conditions are shown in Table 10.

[0068] Table 10 Deposition parameters of the Ti compound layer 7 on the surface

[0069] The deposition process parameters for each layer of the tool, T1-T8, are shown in Table 11.

[0070] Table 11 Deposition process of each layer for T1-T8 cutting tools

[0071] The thickness of each layer in surface coating 2 can be adjusted according to time.

[0072] Surface coating thickness measurement The thickness of each coating layer can be observed using SEM or metallographic microscopy. A vertical cross-section containing the coating is obtained by cutting along the vertical direction of the blade with a diamond saw blade. After mounting, grinding, and polishing, the cross-section is observed using SEM or metallographic microscopy. The thicknesses of the bottom TiCN layer 51, the middle (TiAl)(CNO) layer 52, and the upper oxide layer 53 in the BL layer are observed and measured using TEM. A vertical cross-section containing the coating is obtained by cutting along the vertical direction of the blade with a FIB, and then observed using TEM. The thicknesses of each layer of the T1-T8 tools are shown in Table 1.

[0073] Structure and columnar crystal size detection of α-Al2O3 coating 6 A vertical cross-section containing the coating was obtained by cutting along the vertical direction of the blade using a diamond saw blade. After mounting, grinding, and polishing, the cross-sectional SEM morphology was observed in SEM-SE mode. For the T1 blade in this embodiment, the cross-sectional SEM morphology is as follows: Figure 3 As shown, the average width of the columnar grains measured at 50% of the thickness along the α-Al2O3 growth direction on a cross section perpendicular to the coating surface is 0.55 μm, the thickness of the α-Al2O3 coating 6 is 6.5 μm, and the ratio of h to d is h / d = 11.8. Using the same calculation method, the h to d ratios for the α-Al2O3 coating 6 of the T2-T8 tools can be calculated to be 12.5, 13.6, 12.8, 12.9, 12.5, 13.6, and 13.2, respectively.

[0074] Texture orientation detection of α-Al2O3 coating 6 The texture orientation of α-Al₂O₃ coating 6 was calculated based on XRD diffraction analysis data. TC(hkl) is defined as follows: (1-1) in, I(hkl) = (hkl) is the measured intensity of the reflected light. I0(hkl) = Standard intensity of reflection based on the standard powder diffraction data (hkl) of the applied JCPDF card No. 10-0173. n = the number of reflections used in the calculation; in this example, n = 9. (hkl) i The (hkl) used iThe reflective crystal planes are: (012), (104), (110), (113), (116), (214), (300), (1010) and (0012).

[0075] like Figure 2 As shown, according to the XRD diffraction pattern, the (1010) peak (2θ=76.88°) of α-Al2O3 (JCPDF card number: 10-0173) overlaps with the (222) peak (2θ=76.77°) of TiCN (JCPDF card number: 42-1489). Therefore, the intensity of the (1010) peak of TiCN needs to be subtracted when calculating the intensity of the (1010) peak of α-Al2O3. According to the standard diffraction pattern of TiCN (JCPDF card number: 42-1489), the intensities of the (111) peak and the (222) peak of TiCN are as follows: , (1-2) The actual intensity value of the TiCN(222) peak is: (1-3) The actual intensity of the (1010) peak of α-Al2O3 (JCPDF card number: 10-0173) is: (1-4) Based on equations (1-2), (1-3), and (1-4), the actual intensity of the (1010) peak of α-Al2O3 (JCPDF card number: 10-0173) after subtracting the (222) peak intensity of TiCN (JCPDF card number: 42-1489) can be calculated. Based on equations (1-1) and (1-4), the texture orientation of the α-Al2O3 coating 6 on cutting tools T1-T8 can be calculated, and the results are shown in Table 2.

[0076] Comparative Example 1 This comparative example provides a cutting tool D1, the preparation method of which includes the following steps: Tool D1 uses the same substrate and groove shape as tool T1 in Example 1, and adopts the same preparation process as tool T1 for the bottom Ti compound layer 3 and the middle Ti compound layer 4. A BL layer is deposited on the middle Ti compound layer 4. The process parameters of the BL layer are as follows: First step, temperature 1000℃, deposition pressure 36kPa, using one-way reaction gas for deposition, introducing 0.85 vol% TiCl4, 35.5 vol% N2, 2.1 vol% CH4, 0.5 vol% HCl and the balance H2, deposition time 15 min; Second step... The second step involves a deposition temperature of 1000℃ and a deposition pressure of 8 kPa, using a single reactive gas stream. The gas stream consists of 1.53 vol% TiCl4, 37.5 vol% N2, 1.42 vol% CO, 0.42 vol% AlCl3, and the remainder H2. The deposition time is 30 min. The third step involves a deposition temperature of 1000℃ and a deposition pressure of 5.5 kPa, using a single reactive gas stream. The gas stream consists of 15.5 vol% N2, 1.10 vol% CO2, 5.15 vol% CO, and the remainder H2. The deposition time is 2 min. Next, an α-Al₂O₃ growth layer was deposited on the surface of the BL layer under the following conditions: temperature 1000℃, deposition pressure 6 kPa, and the composition of the deposition gas was 1.83 vol% AlCl₃, 0.17 vol% H₂S, 2.45 vol% CO₂, 0.75 vol% CO, 0.71 vol% HCl, and the balance H₂. The thickness of the α-Al₂O₃ layer was adjusted to 6.5 μm by adjusting the time. Finally, a surface TiN layer was deposited using the same preparation process as the surface Ti compound layer 7 used for tool T1. The texture coefficient of the α-Al₂O₃ layer of tool D1 was obtained by XRD detection and calculation using equations (1-2), (1-3), and (1-4) in Example 1, as shown in Table 12.

[0077] Table 12 Texture coefficients of α-Al2O3 (JCPDF card number: 10-0173) in tool D1

[0078] Comparative Example 2 This comparative example provides a cutting tool D2, the preparation method of which includes the following steps: Tool D2 uses the same base and groove shape as tool T1, and adopts the same preparation process as tool T3 for bottom Ti compound layer 3 and middle Ti compound layer 4. A BL layer was deposited on the central Ti compound layer 4. The process parameters were as follows: Step 1: Temperature 1000℃, deposition pressure 40kPa, using one reactive gas stream, with 0.91 vol% TiCl4, 37.2 vol% N2, 2.4 vol% CH4, 0.5 vol% HCl and the balance H2 introduced, deposition time 15 min; Step 2: Temperature 1000℃, deposition pressure 65mbar, using one reactive gas stream, with 1.52 vol% TiCl4, 19.89 vol% N2, 0.32 vol% CH3CN, 3.78 vol% CO, 0.82 vol% AlCl3 and the balance H2 introduced, deposition time 20 min; Step 3: Temperature 1000℃, deposition pressure 5.5kPa, using one reactive gas stream, with 27.5 vol% N2, 3.20 vol% CO2, 5.15 vol% CO and the balance H2 introduced, deposition time 2 min. Next, an α-Al₂O₃ growth layer was deposited on the surface of the BL layer under the following conditions: temperature 1005℃, deposition pressure 6.5 kPa, and the composition of the deposition gas was 1.97 vol% AlCl₃, 0.56 vol% H₂S, 2.21 vol% CO₂, 0.31 vol% CO, 0.42 vol% HCl, and the balance H₂. The thickness of the α-Al₂O₃ layer was adjusted to 6.5 μm by adjusting the time. Finally, a surface TiN layer was deposited using the same preparation process as the surface Ti compound layer 7 used in tool T2. The texture orientation values ​​of the α-Al₂O₃ layer of tool D2 were obtained by XRD detection and calculation using equations (1-2), (1-3), and (1-4) in Example 1, as shown in Table 13.

[0079] Table 13 Texture coefficient of α-Al2O3 (JCPDF card number: 10-0173) in tool D2

[0080] Comparative Example 3 This comparative example provides a cutting tool D3, the preparation method of which includes the following steps: Tool D3 uses the same substrate and groove shape as tool D2, and employs the same preparation process for the bottom Ti compound layer 3, the middle Ti compound layer 4, and the BL layer process as tool D2. The deposition conditions for its α-Al2O3 growth layer are as follows: temperature 1005℃, deposition pressure 5.5 kPa, and the composition of the deposition gas is 1.67 vol% AlCl3, 0.15 vol% H2S, 6.21 vol% CO2, 1.51 vol% CO, 1.42 vol% HCl, and the balance H2. The thickness of the α-Al2O3 coating 6 is adjusted to 6.5 μm by adjusting the time. Finally, the surface Ti compound layer 7 is deposited using the same preparation process as tool D2. The texture orientation values ​​of the α-Al2O3 coating of tool D3, obtained by XRD analysis and calculation using equations (1-2), (1-3), and (1-4) in Example 1, are shown in Table 14.

[0081] Table 14 Texture Coefficient of α-Al2O3 (JCPDF Card No.: 10-0173) in Tool D3

[0082] Cutting Test 1 The T1-T8 cutting tools prepared in Example 1 and the comparative cutting tools D1, D2 and D3 prepared in Comparative Examples 1-3 were subjected to stress relief treatment by sandblasting using conventional coating post-treatment methods, and then comparative cutting tests were conducted.

[0083] The cutting tools were subjected to turning tests as shown in Table 15. The final life evaluation was based on the machining time corresponding to the wear value of the tool face reaching 0.3 mm. Their wear resistance life is shown in Table 16.

[0084] Table 15 Parameter Table for Turning Experiment Mode

[0085] Table 16 Comparison of Experimental Results

[0086] As shown in Table 16, under the cutting parameters in Table 15, the wear life of the tool of the present invention is increased by about 30% on average compared with the comparative tool.

[0087] Cutting Test 2 The T1-T8 cutting tools prepared in Example 1 and the comparative cutting tools D1, D2 and D3 prepared in Comparative Examples 1-3 were subjected to stress relief treatment by sandblasting using conventional coating post-treatment methods, and then comparative cutting tests were conducted.

[0088] The cutting tools were subjected to turning tests as shown in Table 17. The final life evaluation was based on the machining time corresponding to the wear value of the tool face reaching 0.3 mm. Their wear resistance life is shown in Table 18.

[0089] Table 17 Parameter Table for Turning Experiment Mode

[0090] Table 18 Comparison of Experimental Results

[0091] As shown in Table 18, under the cutting parameters in Table 17, the wear life of the tool of the present invention is increased by more than 50% on average compared with that of the comparative tool.

[0092] A comprehensive comparison of cutting experiments 1 and 2 reveals that when turning QT500 material, at the same cutting speed, the wear life of all tools decreases with increasing depth of cut and feed rate. However, under the same parameters, the wear life of the tool of this invention is higher than that of the comparative tool. Moreover, at the same cutting speed, under conditions of large depth of cut and large feed rate, the tool of this invention exhibits superior wear resistance, demonstrating its superior cutting performance in the field of high-efficiency machining.

[0093] Cutting test 3 The substrates for the T9 and T10 tools and the comparative tools D4, D5, and D6 of this invention were prepared according to the following process: A mixture of powders containing 7% Co, 4.9% TaNbC, 2.62% TiC, 0.38% TiN, 0.15% Cr3C2, and the balance WC with a particle size of 1.5-1.8 μm was pressed, sintered, and ground to produce a surface-rich binder-phase gradient cemented carbide substrate with the blade shape specified in ISO standard WNMG080408-XM. The thickness of the surface-rich binder phase was 20 μm-25 μm. The T9 tool was manufactured using the coating process of the T3 tool in Example 1, and the T10 tool was manufactured using the coating process of the T6 tool in Example 1. Tools D4, D5, and D6 were manufactured using the same coating processes as tools D1, D2, and D3 in Comparative Examples 1, 2, and 3, respectively. By adjusting the deposition time, the thicknesses of the central Ti compound layer and the α-Al2O3 coating on tools D4, D5, and D6 were adjusted to be similar to those on tools T9 and T10, respectively. The thicknesses of the central Ti compound layer on tools D4, D5, and D6 were 9.8 μm, 6.2 μm, and 10.1 μm, respectively, and the thicknesses of the α-Al2O3 coating on tools D4, D5, and D6 were 6.1 μm, 10.1 μm, and 6.0 μm, respectively. After coating production, the tools underwent stress-relieving sandblasting treatment using conventional post-coating methods and were then subjected to comparative cutting tests.

[0094] The five cutting tools were subjected to turning tests as shown in Table 19. The final life evaluation was based on the machining time corresponding to a tool wear value of 0.3 mm, and the wear life is shown in Table 20.

[0095] Table 19 Parameter Table for Turning Experiment Mode

[0096] Table 20 Comparison of Experimental Results

[0097] As shown in Table 20, under the cutting parameters in Table 19, the wear life of the tool of the present invention is increased by more than 30% on average compared with the comparative tool. The coating tool of the present invention has a significantly better life than the comparative tool, demonstrating excellent wear resistance.

[0098] Cutting test 4 The prepared T9, T10, D4, D5, and D6 cutting tools were subjected to turning tests as shown in Table 21. The final life evaluation was based on the machining time corresponding to a tool wear value of 0.3 mm, and their wear resistance life is shown in Table 22.

[0099] Table 21 Parameter Table for Turning Experiment Mode

[0100] Table 22 Comparison of Experimental Results

[0101] As shown in Table 22, under the cutting parameters in Table 21, the wear life of the tool of the present invention is increased by more than 50% on average compared with the comparative tool. The coating tool of the present invention has a significantly better life than the comparative tool, demonstrating excellent wear resistance. Combining comparative cutting experiments 3 and 4, it can be found that when turning 42CrMo material, at the same cutting speed, the wear life of all tools decreases with increasing depth of cut and feed rate. However, under the same parameters, the wear life of the tool of the present invention is higher than that of the comparative tool. Moreover, at the same cutting speed, under conditions of large depth of cut and large feed rate, the tool of the present invention exhibits superior wear resistance, demonstrating its superior cutting performance in the field of high-efficiency machining.

[0102] Cutting test (impact resistance test) The T1-T8 cutting tools produced according to Example 1 and the comparative cutting tools D1, D2 and D3 prepared according to Comparative Examples 1-3 were subjected to stress relief treatment by sandblasting using conventional coating post-treatment methods, and then comparative cutting tests were conducted.

[0103] The workpiece material was a longitudinally divided, four-grooved, heat-treated round bar of 1045 steel. The cutting speed was 220 m / min, the depth of cut was 2.0 mm, the feed rate was 0.30 mm / rev, the cutting method was intermittent wet cutting, and the cooling method was water cooling. The final life assessment was based on the machining time or turning time reaching 5 minutes when chipping occurred at the tool tip with a notch depth of 0.3 mm. Six sets of tests were repeated for each example sample, and the average value was taken. The test results are shown in Table 23.

[0104] Table 23 Comparison of Experimental Results

[0105] As shown in Table 23, using the same tool substrate and groove shape, the impact resistance test life of the coated tool of the present invention exceeds 230 seconds, while the impact resistance test life of the comparative tool does not exceed 50 seconds, demonstrating the excellent impact resistance performance of the coated tool of the present invention.

[0106] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the spirit and technical essence of the present invention. Therefore, any simple modifications, equivalent substitutions, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall still fall within the protection scope of the technical solutions of the present invention.

Claims

1. A surface-coated cutting tool with a preferred texture orientation, characterized in that, The tool includes a tool substrate (1) and a surface coating (2) disposed on the tool substrate (1), wherein at least one layer of the surface coating (2) is an α-Al2O3 coating (6), and the α-Al2O3 coating (6) has a preferred texture orientation relative to the {1010} and {0012} planes of the crystal, and the texture coefficient satisfies the following characteristics: 5.0≤TC(1010)+TC(0012)<9.0, and 3.0≤TC(1010)<9.0, 0<TC(0012)<4.

0.

2. The surface-coated cutting tool with preferred texture orientation according to claim 1, characterized in that, 3.0≤TC(1010)<8.0, 1.0<TC(0012)<4.

0.

3. The surface-coated cutting tool with preferred texture orientation according to claim 1, characterized in that, The texture factor of the surface coating (2) is denoted by TC(hkl), which is defined as follows: in, I(hkl) = (hkl) is the measured intensity of the reflected light. I0(hkl) = Standard intensity of reflection based on the standard powder diffraction data (hkl) of the applied JCPDF card No. 10-0173. n represents the number of reflections used in the calculation; n=9. (hkl) i The (hkl) used i The reflective crystal planes are (012), (104), (110), (113), (116), (214), (300), (1010) and (0012).

4. The surface-coated cutting tool with preferred texture orientation according to any one of claims 1 to 3, characterized in that, A central Ti compound layer (4) is provided between the tool substrate (1) and the α-Al2O3 coating (6), and a BL layer (5) is provided between the central Ti compound layer (4) and the α-Al2O3 coating (6).

5. The surface-coated cutting tool with preferred texture orientation according to claim 4, characterized in that, The BL layer (5) includes a TiCN layer (51), a (TiAl)(CNO) layer (52), and an oxide layer (53) arranged sequentially from bottom to top.

6. The surface-coated cutting tool with preferred texture orientation according to claim 5, characterized in that, The average thickness of the BL layer (5) is 0.115 μm to 2.25 μm, the average thickness of the TiCN layer (51) is 0.1 μm to 2.0 μm, the average thickness of the (TiAl)(CNO) layer (52) is 0.01 μm to 0.2 μm, and the average thickness of the oxide layer (53) is 0.005 μm to 0.05 μm.

7. The surface-coated cutting tool with preferred texture orientation according to claim 4, characterized in that, A bottom Ti compound layer (3) is provided between the tool substrate (1) and the middle Ti compound layer (4).

8. The surface-coated cutting tool with preferred texture orientation according to claim 7, characterized in that, The middle Ti compound layer (4) is composed of Ti compounds, and the average thickness of the middle Ti compound layer (4) is 0.1 μm to 18 μm; the bottom Ti compound layer (3) is a TiN layer, and the average thickness of the bottom Ti compound layer (3) is 0.1 μm to 2.0 μm.

9. A surface-coated cutting tool with a preferred texture orientation according to any one of claims 1 to 3, characterized in that, The α-Al2O3 coating (6) has a surface Ti compound layer (7), which is a TiN layer, and the average thickness of the surface Ti compound layer (7) is 0.1 μm to 3 μm.

10. A surface-coated cutting tool with a preferred texture orientation according to any one of claims 1 to 3, characterized in that, The surface coating (2) has a total thickness of 2 μm to 35 μm.

11. The surface-coated cutting tool with preferred texture orientation according to any one of claims 1 to 3, characterized in that, The microstructure of the α-Al2O3 coating (6) is a fibrous columnar structure. The average width of the columnar crystal grains at 50% of the thickness along the growth direction of the α-Al2O3 coating (6) on a cross section perpendicular to the α-Al2O3 coating (6) is set as d, and the thickness of the α-Al2O3 coating (6) is set as h. The ratio of h to d is h / d≥10.

12. A method for preparing a surface-coated cutting tool with a preferred texture orientation as described in any one of claims 1 to 11, characterized in that, Includes the following steps: A surface coating (2) is deposited on the tool substrate (1), wherein at least one layer of the surface coating (2) is an α-Al2O3 coating (6). The α-Al2O3 coating (6) is deposited using a CVD process, and the deposition process conditions are: deposition temperature 980℃~1010℃, deposition pressure 4kPa~20kPa, and 1.5vol%~6.5vol% AlCl3 gas, 0.5vol%~5.0vol% CO2 gas, 0.5vol%~6.0vol% CO gas, and 0. The deposition process involves introducing 3 vol%–1.5 vol% HCl gas and the remainder H2, with a deposition time of 15–75 min. Then, the following gases are introduced: 2.0 vol%–8.0 vol% AlCl3 gas, 1.0 vol%–5.0 vol% CO2 gas, 1.0 vol%–10.0 vol% CO gas, 0.2 vol%–1.0 vol% H2S gas, 0.3 vol%–2.2 vol% HCl gas, and the remainder H2 gas. The volume fraction V of CO2 in the reintroduced deposition gas is... CO2 Volume fraction V of AlCl3 AlCl3 The ratio V CO2 / V AlCl3 The volume fraction V of H2S is 0.3–0.

9. H2S V, the ratio of the volume fractions of CO2 and CO to the sum of their volume fractions H2S / (V CO2 +V CO The concentration of the precipitate was 0.05–0.20, and the deposition time was 30 min–1000 min.

13. The method for preparing a surface-coated cutting tool with preferred texture orientation according to claim 12, characterized in that, A central Ti compound layer (4) is provided between the tool substrate (1) and the α-Al2O3 coating (6). The central Ti compound layer (4) is deposited by CVD process. The deposition process conditions are: deposition temperature 810℃~950℃, deposition pressure 4kPa~50kPa, and the composition of the deposition gas is 2.1vol%~13.0vol% TiCl4 gas, 35.0vol%~61.5vol% N2 gas, 0.4vol%~1.2vol% CH3CN gas, 0.3vol%~1.5vol% HCl gas and the balance H2 gas.

14. The method for preparing a surface-coated cutting tool with preferred texture orientation according to claim 13, characterized in that, A BL layer (5) is provided between the central Ti compound layer (4) and the α-Al2O3 coating (6). The BL layer (5) includes a TiCN layer (51), a (TiAl)(CNO) layer (52), and an oxide layer (53) arranged sequentially from bottom to top. The TiCN layer (51), the (TiAl)(CNO) layer (52), and the oxide layer (53) are all deposited using CVD technology. The deposition process is carried out using a coating furnace with two gas inlets. The deposition process conditions for the TiCN layer (51) are as follows: deposition temperature 900℃~1010℃, deposition pressure 0.5kPa~4kPa, and two gas streams are used to load the coating furnace. The first gas stream, Q1, consists of 2.0vol%~13.0vol% TiCl4 gas, 5.0vol%~25.0vol% N2 gas, 0.7vol%~5.0vol% CH4 gas, and the balance H2 gas. The second gas stream, Q2, consists of 0.5vol%~2.0vol% NH3 gas and the balance H2 gas. The volume ratio of the first gas stream, Q1, to the second gas stream, Q2 is 1.1~5.0, and the volume fraction of N2 is V. N2 Volume fraction V of NH3 NH3 Ratio V N2 / V NH3 The volume fraction V of CH4 is 10–50. CH4 The ratio V to the total volume fraction of nitrogen-containing gas CH4 / (V N2 +V NH3 The volume fraction V of TiCl4 is 0.05–0.

50. TiCl4 Volume fraction V of NH3 NH3 The ratio V TiCl4 / V NH3 The value ranges from 5.0 to 45. The deposition process conditions for the (TiAl)(CNO) layer (52) are as follows: deposition temperature 950℃~1010℃, deposition pressure 0.8kPa~4kPa, and two gas streams are used to load the coating furnace. The first mixed gas P1 consists of 2.0vol%~15.0vol% TiCl4 gas, 0.5vol%~5.5vol% AlCl3 gas, 1.2vol%~3.0vol% oxygen-containing gas, 8.0vol%~20.0vol% N2 and the balance H2. The oxygen-containing gas is composed of CO2 and CO or CO. The volume fraction V of CO2 in the first mixed gas P1 is... CO2 Volume fraction of CO V CO The ratio satisfies the condition 0 ≤ V CO2 / V CO ≤0.6, the composition of the second gas mixture P2 is 0.5 vol% to 2.0 vol% NH3 and the balance H2; in the two gas mixtures, the volume ratio of the first gas mixture P1 to the second gas mixture P2 is 1.0 to 5.0, and the volume fraction of N2 is V N2 Volume fraction V of NH3 NH3 The ratio V N2 / V NH3 The volume fraction V of TiCl4 gas is 15–62. TiCl4 Volume fraction V of NH3 gas NH3 The ratio V TiCl4 / V NH3 The value ranges from 6.0 to 35.

0. The deposition process conditions for the oxide layer (53) are as follows: deposition temperature is 950℃~1010℃, deposition pressure is 1kPa~7kPa, and deposition is carried out using a single reactive gas. First, 2.0vol%~11.0vol% TiCl4 gas, 1.5vol%~5.5vol% AlCl3 gas and the balance H2 are introduced, and the deposition time is 1min~10min. Then, 1.5vol%~4.0vol% CO2 gas, 3.0vol%~11.0vol% CO gas and the balance H2 are introduced. In the re-introduced deposition gas, the volume fraction V of CO gas is... CO Volume fraction of CO2 gas V CO2 The ratio V CO / V CO2 The pH ranges from 1.2 to 3.5, and the deposition time is from 1 to 10 minutes.

15. The method for preparing a surface-coated cutting tool with preferred texture orientation according to claim 13, characterized in that, A bottom Ti compound layer (3) is provided between the tool substrate (1) and the middle Ti compound layer (4). The bottom Ti compound layer (3) is deposited by CVD process. The deposition process conditions are: deposition temperature 810℃~950℃, deposition pressure 4kPa~50kPa, and the composition of the deposition gas is 2.1vol%~13.0vol% TiCl4 gas, 32.0vol%~50.5vol% N2 and the balance H2.

16. The method for preparing a surface-coated cutting tool with preferred texture orientation according to claim 12, characterized in that, The α-Al2O3 coating (6) has a surface Ti compound layer (7), which is deposited by CVD process. The deposition process conditions are: deposition temperature 950℃~1010℃, deposition pressure 50kPa~65kPa, and the composition of the deposition gas is 2.5vol%~13.0vol% TiCl4 gas, 32.0vol%~65.0vol% N2 and the balance H2.

17. The application of a surface-coated cutting tool with preferred texture orientation as described in any one of claims 1 to 11, or a surface-coated cutting tool with preferred texture orientation prepared by the preparation method as described in any one of claims 12 to 16, in the field of machining cast iron, stainless steel, or alloy steel materials.

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