Coated and cutting tools

Abstract

A coated tool according to one non-limiting aspect of the present disclosure is provided with a base body and a coating layer located on the surface of the base body, in which the base body has a film adhesive phase containing Co and at least one metal compound selected from a carbide, a nitride and a carbonitride each containing Ti and W, and the film adhesive phase is located at the interface between the base body and the coating layer. A cutting tool according to one non-limiting aspect of the present disclosure is provided with: a holder that extends from a first end toward a second end and has a pocket on the first end side; and the above-mentioned coated tool that is located in the pocket.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to Japanese Patent Application No. 2022-116251, filed on July 21, 2022, the entire disclosure of which is incorporated herein by reference. [Technical Field]

[0002] The present disclosure relates to coated tools and cutting tools. [Background technology]

[0003] Cemented carbide containing tungsten carbide (WC) as a hard phase is used as the substrate of coated tools and is utilized in cutting tools such as end mills. For example, Japanese Patent Laid-Open Publication No. 2004-100004 (Patent Document 1) describes a coated cemented carbide in which a layered coating adhesion phase is formed between the coating and the cemented carbide substrate. The layered coating adhesion phase is composed of at least one metal compound selected from carbides, nitrides, and carbonitrides containing Ti and W.

[0004] Furthermore, Japanese Patent Laid-Open Publication No. 1-252306 (Patent Document 2) describes a cutting tool in which a coating layer is formed on the surface of a cemented carbide substrate via an adhesion-reinforcing layer. The adhesion-reinforcing layer is composed of a lower layer containing a predetermined proportion of Co and W and the remainder being titanium carbide, an intermediate layer made of titanium carbonitride or the like, and an upper layer made of titanium carbide. Summary of the Invention

[0005] A non-limiting aspect of the coated tool of the present disclosure is a coated tool having a substrate and a coating layer located on the surface of the substrate, wherein the substrate has a coating adhesion phase containing Co and at least one metal compound selected from carbides, nitrides, and carbonitrides containing Ti and W, and the coating adhesion phase is located at the interface between the substrate and the coating layer.

[0006] A non-limiting aspect of the cutting tool of the present disclosure includes a holder extending from a first end to a second end and having a pocket on the first end side, and the coated tool described above positioned in the pocket. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view of a non-limiting one-sided coated tool of the present disclosure. [Figure 2] FIG. 2 is a schematic cross-sectional view of the coated tool shown in FIG. 1, showing the vicinity of the interface between the substrate and the coating layer. [Figure 3] 1 is a cross-sectional view showing the vicinity of a surface of a non-limiting coated tool of the present disclosure. [Figure 4] 1 is a cross-sectional view showing the vicinity of a surface of a non-limiting coated tool of the present disclosure. [Figure 5] FIG. 1 is a perspective view of a non-limiting one-sided cutting tool of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0008] <Coated tools> A non-limiting example of a coated tool 1 according to the present disclosure will be described in detail below with reference to the drawings. However, for the sake of convenience, the drawings below show only the main components necessary for explaining the embodiment in a simplified form. Therefore, the coated tool 1 may include optional components not shown in the drawings. Furthermore, the dimensions of the components in the drawings do not faithfully represent the actual dimensions of the components or the dimensional ratios of the components. These points also apply to the cutting tool described below.

[0009] The coated tool 1 may have a substrate 3 and a coating layer 7 (film layer) located on a surface 5 of the substrate 3, as a non-limiting example shown in FIGS.

[0010] The substrate 3 may have a coating adhesion phase 9. The coating adhesion phase 9 may be a part of the substrate 3. The coating adhesion phase 9 may contain at least one metal compound selected from carbides, nitrides, and carbonitrides containing Ti (titanium) and W (tungsten), and Co (cobalt).

[0011] The coating adhesion phase 9 may contain a metal compound and Co as the main components. The term "main component" may refer to the component having the largest mass% value compared to other components. Therefore, the total mass% value of the metal compound and Co may be the largest in the coating adhesion phase 9. Furthermore, the top two mass% values ​​of the components contained in the coating adhesion phase 9 may be the metal compound and Co.

[0012] Elemental analysis may be performed, for example, by energy dispersive X-ray spectroscopy (EDS). Elemental analysis may also be performed by cross-sectional observation using an EDS attached to an electron microscope. Examples of electron microscopes include scanning electron microscopes (SEM) and transmission electron microscopes (TEM).

[0013] Here, the coating adhesion phase 9 may be located at the interface S between the substrate 3 and the coating layer 7, as in a non-limiting example shown in FIG. 2. The coating adhesion phase 9 having the above composition can function as a phase that enhances adhesion to the coating layer 7 in the substrate 3. Therefore, when the coating adhesion phase 9 is located at the interface S between the substrate 3 and the coating layer 7, adhesion between the substrate 3 and the coating layer 7 is likely to be improved. Therefore, the coated tool 1 has high adhesion between the substrate 3 and the coating layer 7. In addition, the coated tool 1 has high wear resistance.

[0014] The substrate 3 may have a hard phase 11 , a solid solution phase 13 and a binder phase 15 .

[0015] The hard phase 11 may contain W and C. In other words, the hard phase 11 may contain WC. The hard phase 11 may contain WC as a main component. Of the components contained in the hard phase 11, the top two in terms of mass% may be W and C.

[0016] The solid solution phase 13 may contain W, C, and Ti. The solid solution phase 13 may contain W, C, and Ti as main components. That is, in the solid solution phase 13, the total mass% of W, C, and Ti may be the largest. Furthermore, the top three mass% values ​​of the components contained in the solid solution phase 13 may be W, C, and Ti.

[0017] The binder phase 15 may contain an iron group metal. Examples of iron group metals include Co and Ni (nickel). The binder phase 15 may contain at least one of Co and Ni. The binder phase 15 may contain an iron group metal as a main component. The binder phase 15 can function as a phase that binds adjacent hard phases 11 together.

[0018] The substrate 3 may be a cemented carbide alloy having a hard phase 11, a solid solution phase 13, and a binder phase 15. The coating adhesion phase 9 may have a higher content of β component and Co than the binder phase 15. In these cases, chipping resistance is likely to be improved. The content of β component and Co in the coating adhesion phase 9 may be 50 to 95 mass %. The content of β component and Co in the binder phase 15 may be 20 to 60 mass %. The "content of β component and Co" means the sum of the content of β component and the content of Co.

[0019] The β component may include, for example, Ti. The compositions of the hard phase 11, the solid solution phase 13, and the binder phase 15 may be measured by, for example, EDS. The measurement may be performed using an EDS attached to an electron microscope.

[0020] As a non-limiting example shown in Figure 2, the coating adhesion phase 9 may have a wavy shape in a cross section perpendicular to the surface 5 of the substrate 3. In this case, chipping resistance is likely to be improved. In the above cross section, the coating adhesion phase 9 may be in contact with the hard phase 11 at a portion opposite the interface S. The portion of the coating adhesion phase 9 in contact with the hard phase 11 may have a wavy shape.

[0021] The coating adhesion layer 9 may have an average thickness of 0.05 to 0.5 μm, which is likely to improve chipping resistance.

[0022] The thickness of the coating adhesion phase 9 may be measured by cross-sectional observation using an electron microscope. For example, the thickness may be measured at five or more measurement points at any position of the coating adhesion phase 9, and the average value may be calculated.

[0023] 2, in a cross section perpendicular to the surface 5 of the substrate 3, the coating adhesion phase 9 may be formed in 20 to 70 percent of the interface S between the substrate 3 and the coating layer 7. In this case, the adhesion between the substrate 3 and the coating layer 7 is likely to be improved.

[0024] 2, in a cross section perpendicular to the surface 5 of the substrate 3, the coating adhesion phase 9 may be discontinuous in the direction along the interface S. In this case, chipping resistance is likely to be improved.

[0025] When the coating adhesive phase 9 is discontinuous, the hard phase 11 may be located between adjacent coating adhesive phases 9. Adjacent coating adhesive phases 9 may be in contact with the hard phase 11 located between them. The coating adhesive phase 9 is not limited to a structure in which it is discontinuous in the direction along the interface S. The coating adhesive phase 9 may be continuous in the direction along the interface S.

[0026] The composition of the substrate 3 may contain Nb (niobium), which tends to improve the wear resistance of the coated tool 1. The content of Nb in the substrate 3 may be 0.1 to 3 mass %.

[0027] The substrate 3 may be a cemented carbide having a hard phase 11, a solid solution phase 13, and a binder phase 15. The substrate 3 may further have a β phase 17. Nb may be contained in the β phase 17, the binder phase 15, or both. In this case, the wear resistance of the coated tool 1 is likely to be high.

[0028] The β phase 17 may be a composite carbide containing at least one of Ti, Nb, Ta (tantalum), and Zr (zirconium), and W. The composition of the β phase 17 may be measured by, for example, EDS.

[0029] The coating layer 7 may be located on the entire surface 5 of the substrate 3, or may be located on only a portion of the surface 5. In other words, the coating layer 7 may be located on at least a portion of the surface 5 of the substrate 3.

[0030] The coating layer 7 may be formed by a chemical vapor deposition (CVD) method. In other words, the coating layer 7 may be a CVD film. The coating layer 7 may also be a physical vapor deposition (PVD) film formed by a PVD method.

[0031] The coating layer 7 may be a single layer or a laminate of multiple layers. Examples of the composition of the coating layer 7 include TiCN (titanium carbonitride), Al2O3 (alumina), and TiN (titanium nitride).

[0032] 3, the coating layer 7 may have, in this order from the substrate 3 side, a TiCN layer 19 and an Al2O3 layer 21. The TiCN layer 19 may be in contact with the substrate 3. The Al2O3 layer 21 may be in contact with the TiCN layer 19.

[0033] 4, the coating layer 7 may have, in this order from the substrate 3 side, a TiN layer 23, a TiCN layer 19, and an Al2O3 layer 21. The TiN layer 23 may be in contact with the substrate 3. The TiCN layer 19 may be in contact with the TiN layer 23. The Al2O3 layer 21 may be in contact with the TiCN layer 19.

[0034] The coating layer 7 is not limited to a specific thickness. For example, the TiCN layer 19 may have an average thickness of about 1 to 15 μm. The Al2O3 layer 21 may have an average thickness of about 1 to 15 μm. The TiN layer 23 may have an average thickness of about 0.1 to 5 μm. The thickness of the coating layer 7 may be measured by cross-sectional observation using an electron microscope. For example, the thickness may be measured at 10 or more measurement points at any position on each layer, and the average value may be calculated.

[0035] 1 shows a cutting insert as a non-limiting example of the coated tool 1. However, the coated tool 1 is not limited to the cutting insert.

[0036] The coated tool 1 may have a first surface 25 (top surface), a second surface 27 (side surface) adjacent to the first surface 25, and a cutting edge 29 located on at least a portion of the ridge line between the first surface 25 and the second surface 27.

[0037] The first surface 25 may be a rake face. The entire first surface 25 may be a rake face, or only a part of the first surface 25 may be a rake face. For example, a region of the first surface 25 along the cutting edge 29 may be a rake face.

[0038] The second surface 27 may be a flank. The entire surface of the second surface 27 may be a flank, or only a part of the second surface 27 may be a flank. For example, a region of the second surface 27 along the cutting edge 29 may be a flank.

[0039] The cutting edge 29 may be located on a part of the ridgeline, or may be located on the entire ridgeline. The cutting edge 29 can be used to cut a workpiece. The coating adhesion phase 9 may be located at the interface S between the substrate 3 and the coating layer 7 where the cutting edge 29 is located. In this case, the cutting edge 29 is less likely to chip.

[0040] The coated tool 1 may have a through hole 31. The through hole 31 can be used to attach a fixing screw or a clamp member when holding the coated tool 1 in a holder. The through hole 31 may be formed from the first surface 25 to the surface (lower surface) located opposite the first surface 25, or may open in these surfaces. Note that there is no problem if the through holes 31 are configured to open in opposing regions of the second surface 27.

[0041] The coated tool 1 may have a rectangular plate shape. However, the shape of the coated tool 1 is not limited to a rectangular plate shape. For example, the first surface 25 may have a triangular, pentagonal, hexagonal, or circular shape.

[0042] The coated tool 1 is not limited to a specific size. For example, the length of one side of the first surface 25 may be set to about 3 to 20 mm. Furthermore, the height from the first surface 25 to the surface (lower surface) located on the opposite side of the first surface 25 may be set to about 5 to 20 mm.

[0043] <Method of manufacturing coated tools> Next, a non-limiting method for manufacturing a coated tool on one side according to the present disclosure will be described using an example in which the coated tool 1 is manufactured.

[0044] When manufacturing the coated tool 1, the substrate 3 may be prepared first. An example of preparing the substrate 3 made of cemented carbide will be described. First, WC powder, TiC powder, TaC powder, ZrC powder, Co powder, NbC powder, etc. may be prepared as raw material powder.

[0045] The proportion of TiC powder may be 0.5 to 5 mass%. The proportion of TaC powder may be 0.1 to 5 mass%. The proportion of ZrC powder may be 0.2 to 5 mass%. The proportion of Co powder may be 4 to 15 mass%. The proportion of NbC powder may be 0.1 to 3 mass%. The remainder may be WC powder.

[0046] The average particle size of the raw material powder may be appropriately selected from the range of 0.1 to 10 μm, and may be a value measured by a microtrack method.

[0047] The prepared raw material powders may be mixed and molded to obtain a molded body. Examples of molding methods include press molding, casting, extrusion molding, and cold isostatic pressing.

[0048] The resulting molded body may be subjected to a binder removal treatment and then fired. The firing may be carried out in a non-oxidizing atmosphere such as a vacuum, an argon atmosphere, or a nitrogen atmosphere. The firing temperature may be 1450 to 1600°C. The firing time may be 0.5 to 3 hours.

[0049] After firing, the substrate 3 made of cemented carbide may be cooled. At this time, the cooling rate may be set to 6 to 20°C / minute (°C / min). More specifically, the cooling rate may be set to 6 to 15°C / min. When NbC powder is used as the raw material powder and cooling is performed at the above cooling rate, Nb contained in the composition of the substrate 3 is likely to be contained in the β phase 17, the binder phase 15, or both.

[0050] A temperature-keeping step may also be included during cooling. The "temperature-keeping step" here refers to a step that can be added to the cooling step described above. This cooling step may include a process of maintaining the temperature of the fired body for a certain period of time, rather than simply cooling the fired body at a predetermined cooling rate. This process of maintaining the temperature of the fired body is referred to as the "temperature-keeping step." However, maintaining the temperature of the fired body does not strictly require maintaining a constant temperature; if the temperature difference before and after the "temperature-keeping step" divided by the time during which the temperature-keeping step was performed is smaller than the predetermined cooling rate, the temperature of the fired body may be considered to be maintained. In this case, the substrate 3 is more likely to have a coating adhesion phase 9. The temperature-keeping step may be performed under the following conditions: Time: 0.5 to 2 hours Temperature: 800~1000℃ Pressure: 5~10kPa Atmosphere: Hydrogen atmosphere

[0051] For example, suppose a hold step is added when the sintered body is cooled at a cooling rate of 10°C / minute (°C / min). The conditions for the hold step are set as follows: set temperature 900°C, starting temperature 930°C, ending temperature 870°C, and duration 1 hour (=60 minutes). The rate of temperature change in this hold step is 1 [=(930-870) / 60] (°C / min), which is smaller than the cooling rate of 10°C / minute (°C / min). Therefore, in the above case, it can be said that a hold step was added during cooling.

[0052] Next, a coating layer 7 may be formed on the surface 5 of the obtained substrate 3 by a CVD method, thereby obtaining a coated tool 1.

[0053] The TiCN layer 19 may be formed as follows. First, a mixed gas containing 0.1 to 10 volume % titanium tetrachloride (TiCl4) gas, 10 to 60 volume % nitrogen (N2) gas, 0.1 to 15 volume % methane (CH4) gas, and the remainder hydrogen (H2) gas may be prepared as the reaction gas composition. Then, this mixed gas may be introduced into a chamber, and the temperature may be set to 800 to 1100°C and the pressure may be set to 5 to 30 kPa, and the TiCN layer 19 may be formed.

[0054] The Al2O3 layer 21 may be formed as follows. First, a mixed gas containing 0.5 to 5 volume percent aluminum trichloride (AlCl3) gas, 0.5 to 3.5 volume percent hydrogen chloride (HCl) gas, 0.5 to 5 volume percent carbon dioxide (CO2) gas, 0.5 volume percent or less hydrogen sulfide (H2S) gas, and the remainder hydrogen (H2) gas may be prepared as the reaction gas composition. Then, this mixed gas may be introduced into a chamber, and the temperature may be set to 930 to 1010°C and the pressure may be set to 5 to 10 kPa to form the Al2O3 layer 21.

[0055] The TiN layer 23 may be formed as follows. First, a mixed gas containing 0.1 to 10 volume % titanium tetrachloride (TiCl4) gas, 10 to 60 volume % nitrogen (N2) gas, and the remainder hydrogen (H2) gas may be prepared as the reaction gas composition. Then, this mixed gas may be introduced into a chamber, and the temperature may be set to 800 to 1010°C and the pressure may be set to 10 to 85 kPa, and the TiN layer 23 may be formed.

[0056] The above-described manufacturing method is one example of a method for manufacturing the coated tool 1. Therefore, it goes without saying that the coated tool 1 is not limited to those manufactured by the above-described manufacturing method.

[0057] <Cutting tools> Next, a non-limiting one-sided cutting tool 101 of the present disclosure will be described with reference to the drawings, taking as an example a case where the cutting tool 1 is provided with the above-described coated tool.

[0058] 5, the cutting tool 101 may include a holder 103 extending from a first end 103a to a second end 103b and having a pocket 105 on the side of the first end 103a, and a coated tool 1 positioned in the pocket 105. When the cutting tool 101 includes the coated tool 1, the coated tool 1 has high wear resistance, enabling stable cutting.

[0059] The pocket 105 may be a portion to which the coated tool 1 is attached. The pocket 105 may be open at the outer peripheral surface of the holder 103 and at the end surface on the side of the first end 103a.

[0060] The coated tool 1 may be attached to the pocket 105 so that the cutting edge 29 protrudes outward from the holder 103. Alternatively, the coated tool 1 may be attached to the pocket 105 by a fixing screw 107. That is, the fixing screw 107 may be inserted into the through hole 31 of the coated tool 1, and the tip of the fixing screw 107 may be inserted into a threaded hole formed in the pocket 105 to screw the threaded portions together, thereby attaching the coated tool 1 to the pocket 105. At this time, the lower surface of the coated tool 1 may be in direct contact with the pocket 105, or a sheet may be sandwiched between the coated tool 1 and the pocket 105.

[0061] Examples of materials for the holder 103 include steel and cast iron. When the material for the holder 103 is steel, the holder 103 has high toughness.

[0062] 5 illustrates a cutting tool 101 used for so-called turning. Examples of turning include inner diameter machining, outer diameter machining, and grooving. The application of the cutting tool 101 is not limited to turning. For example, there is no problem in using the cutting tool 101 for milling.

[0063] The above provides examples of the non-limiting one-sided coated tool 1 and cutting tool 101 of the present disclosure, but it goes without saying that the present disclosure is not limited to the above embodiments and can be any as long as it does not deviate from the gist of the present disclosure.

[0064] For example, in the above non-limiting embodiment, the coated tool 1 is used as the cutting tool 101, but the coated tool 1 can also be used in other applications. Examples of other applications include wear-resistant parts such as sliding parts and dies, tools such as drilling tools and blades, and impact-resistant parts.

[0065] The coated tool 1 and the cutting tool 101 may also have the following configurations. (1) A coated tool has a substrate and a coating layer located on the surface of the substrate, wherein the substrate has a coating adhesion phase containing Co and at least one metal compound selected from carbides, nitrides, and carbonitrides containing Ti and W, and the coating adhesion phase is located at the interface between the substrate and the coating layer. (2) In the coated tool of (1) above, the substrate is a cemented carbide alloy having a hard phase containing W and C, a solid solution phase containing W, C, and Ti, and a binder phase containing an iron-group metal, and the coating adhesion phase may have a higher content of β components and Co than the binder phase. (3) In the coated tool of (1) or (2) above, the coating adhesion layer may have a wavy shape in a cross section perpendicular to the surface of the substrate. (4) In the coated tool of any one of the above (1) to (3), the coating adhesion layer may have an average thickness of 0.05 to 0.5 μm. (5) In the coated tool of any one of (1) to (4) above, the coating adhesion phase may be formed in 20% to 70% of the interface between the substrate and the coating layer in a cross section perpendicular to the surface of the substrate. (6) In the coated tool of any one of the above (1) to (5), the composition of the substrate may contain Nb. (7) The coated tool of (6) above is a cemented carbide substrate having a hard phase containing W and C, a solid solution phase containing W, C, and Ti, and a binder phase containing an iron-group metal, and the substrate further has a β phase, and the Nb may be contained in the β phase, the binder phase, or both. (8) In the coated tool of any one of the above (1) to (7), the coating layer may have, in order from the substrate side, a TiCN layer and an Al2O3 layer. (9) In the coated tool of any one of the above (1) to (7), the coating layer may have, in order from the substrate side, a TiN layer, a TiCN layer, and an Al2O3 layer. (10) The cutting tool may include a holder extending from a first end to a second end and having a pocket on the first end side, and a coated tool according to any one of (1) to (9) above, positioned in the pocket.

[0066] The present disclosure will be described in detail below with reference to examples, but the present disclosure is not limited to the following examples. [Example]

[0067] [Sample No. 1-2] <Production of coated tools> First, WC powder with an average particle size of 3 μm, TiC powder with an average particle size of 1 μm, TaC powder with an average particle size of 1 μm, ZrC powder with an average particle size of 1 μm, Co powder with an average particle size of 1.5 μm, and NbC powder with an average particle size of 1 μm were prepared as raw material powders. The average particle size of the raw material powders was measured using the Microtrac method.

[0068] Next, the raw material powders were mixed so that the composition of the coating adhesion phase in the sintered body would be composition A or composition B in Table 1, and the mixture was press-molded into a cutting tool shape (CNMG120408) to obtain a green body. The resulting green body was subjected to a binder removal process, and then sintered by holding it at a temperature of 1450 to 1600°C for 0.5 to 2 hours. After sintering, the green body was cooled to obtain a substrate made of cemented carbide. The cooling rate was set to the conditions shown in Table 2.

[0069] A keeping step was also performed during the cooling process under the following conditions. Time: 1 hour Temperature: 850℃ Pressure: 7.5kPa Atmosphere: Hydrogen atmosphere

[0070] A coating layer was formed on the surface of the obtained substrate by CVD to obtain the coated tool shown in Table 2. The coating layer consisted of, from the substrate side, a TiN layer with an average thickness of 1 μm, a TiCN layer with an average thickness of 10 μm, and an Al2O3 layer with an average thickness of 5 μm.

[0071] The composition of the substrate was measured by EDS. Specifically, cross-sectional observation was performed using an EDS attached to an SEM. Measurements were taken at three arbitrary locations at magnifications of 5,000 to 20,000 times, and the average value was calculated.

[0072] EDS analysis revealed that all of the substrates obtained had a hard phase containing W and C as the main components, a solid solution phase containing W, C, and Ti as the main components, and a binder phase containing an iron-group metal (Co) as the main component. The substrates also had a coating adhesion phase of composition A or B in Table 1. The coating adhesion phase was located at the interface between the substrate and the coating layer. The coating adhesion phase contained a higher amount of the β component (Ti) and Co than the binder phase.

[0073] In a cross section perpendicular to the surface of the substrate, the coating adhesion phase had a wavy shape. More specifically, in the cross section, the portion of the coating adhesion phase opposite the interface was in contact with the hard phase. The portion of the coating adhesion phase in contact with the hard phase had a wavy shape.

[0074] The coating adhesion layer had an average thickness of 0.2 μm. In the cross section above, the coating adhesion layer was formed over 60% of the interface.

[0075] The substrate obtained with composition A contained Nb and had a β phase. The composition of the β phase was measured by EDS and found to be (W, Ti, Nb, Ta, Zr)C. Nb was also contained in the β phase and the binder phase.

[0076] [Sample No. 3] A substrate was prepared under the same conditions as Sample No. 1, except that the cooling rate was set to the conditions shown in Table 2 and no holding step was performed during cooling. A coating layer identical to that of Sample No. 1 was formed on the surface of this substrate by the CVD method, thereby obtaining the coated tool shown in Table 2.

[0077] The composition of the substrate was measured by EDS under the same conditions as for Samples No. 1 and 2. As a result, the obtained substrate had a hard phase containing W and C as the main components, a solid solution phase containing W, C, and Ti as the main components, and a binder phase containing an iron-group metal (Co) as the main component, but no coating adhesion phase.

[0078] <Evaluation> The coated tools thus obtained were subjected to cutting evaluation under the following conditions. Processing method: Turning Cutting speed: 150m / min Feed: 0.4mm / rev Depth of cut: 0.5mm Work material: SCM435 φ200 round bar (with 4 grooves) Processing condition: WET Other: Measurements were performed at n=4 and the average value was calculated.

[0079] The evaluation results are shown in Table 2. Note that the "number of impacts until chipping of the cutting edge" in the evaluation results in Table 2 indicates the number of impacts until chipping of the cutting edge when cutting, and may also be called an intermittent performance evaluation.

[0080] [Table 1]

[0081] [Table 2]

[0082] Compared with sample No. 3, samples Nos. 1 and 2 had higher wear resistance at the cutting edge and were capable of stable cutting as cutting tools. [Explanation of symbols]

[0083] 1. Coated tools 3...Base 5...Surface 7...Coating layer (coating layer) 9. Coating adhesion phase 11...Hard phase 13...Solid solution phase 15...bonded phase 17···β phase 19...TiCN layer 21...Al2O3 layer 23...TiN layer 25...1st surface (top surface) 27...2nd side (side) 29 Cutting edge 31...Through hole 101...Cutting tools 103 Holder 103a...1st end 103b...2nd end 105···Pocket 107···Fixing screw S...interface

Claims

1. A coated tool having a substrate and a coating layer disposed on a surface of the substrate, the substrate has a coating adhesion layer; the coating adhesion phase is located at the interface between the substrate and the coating layer, The coating adhesion phase is The main component is WC, and further contains TiC, TaC, ZrC, and Co, In a cross section perpendicular to the surface of the substrate, the surface is formed in 20 to 70 percent of the interface between the substrate and the coating layer, and The coated tool, wherein the layer in contact with the substrate is a TiN layer having an average thickness of 0.1 to 5 μm or a TiCN layer having an average thickness of 1 to 15 μm.

2. The coated tool according to claim 1 , wherein the coating adhesion layer has a wavy shape in a cross section perpendicular to the surface of the substrate.

3. 3. The coated tool according to claim 1, wherein the coating adhesion layer has an average thickness of 0.05 to 0.5 μm.

4. 3. The coated tool according to claim 1, wherein the composition of the substrate contains Nb.

5. The substrate is a hard phase containing W and C; a solid solution phase containing W, C, and Ti; and a binder phase containing an iron group metal, The substrate further has a β phase, The coated tool according to claim 4, wherein the Nb is contained in the β phase, the binder phase, or both.

6. The coating layer is made up of the TiCN layer and the Al layer in this order from the substrate side. 2 O 3 3. The coated tool according to claim 1, further comprising a layer.

7. The coating layer is made up of the TiN layer, the TiCN layer, and the AlN layer in this order from the substrate side. 2 O 3 3. The coated tool according to claim 1, further comprising a layer.

8. a holder extending from a first end to a second end and having a pocket on the first end side; A cutting tool comprising: the coated tool according to claim 1 or 2 located in the pocket.

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