Coated tool and cutting tool

Abstract

A coated blade according to an unlimited aspect of the present invention has a base body and a coating layer on the surface of the base body, in which the base body has a coating binding phase containing Co and at least one metal compound selected from carbides, nitrides, and carbonitrides containing Ti and W, and the coating binding phase is located at the interface between the base body and the coating layer. A cutting tool according to an unlimited aspect of the present invention is provided with: a shank extending from a first end toward a second end and having a pocket on the first end side; and the coated cutter is positioned in the cutter groove.

Description

[0001] Cross-references of related applications

[0002] This application claims the benefit of priority based on Japanese Patent Application No. 2022-116251 filed on Jul. 21, 2022, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] The invention relates to a coated tool and a cutting tool. Background Art

[0004] Cemented carbide containing WC (tungsten carbide) as a hard phase is used as a substrate in a coated tool, and is used in cutting tools such as end mills. For example, Japanese Patent Publication No. 2004-100004 (Patent Document 1) describes a coated cemented carbide having a layered coating film bonding phase formed between the coating film and the cemented carbide substrate. The layered coating film bonding phase is composed of at least one metal compound selected from carbides, nitrides, and carbonitrides containing Ti and W.

[0005] In addition, Japanese Patent Application Laid-Open No. 1-252306 (Patent Document 2) describes a cutting tool having a coating layer formed on the surface of a cemented carbide substrate via an adhesion strengthening layer. The adhesion strengthening layer is composed of a lower layer containing Co and W in a predetermined ratio and the remainder being composed of titanium carbide, an intermediate layer composed of titanium carbonitride, etc., and an upper layer composed of titanium carbide. Summary of the invention

[0006] A coated tool according to one non-limiting aspect of the present invention comprises a substrate and a coating layer located on the surface of the substrate, wherein the substrate has a coating bonding phase, the coating bonding phase contains at least one metal compound selected from carbides, nitrides, and carbonitrides containing Ti and W, and Co, and the coating bonding phase is located at the interface between the substrate and the coating layer.

[0007] A cutting tool according to one non-limiting aspect of the present invention includes: a shank extending from a first end toward a second end and having a groove on the first end side; and the above-mentioned coated tool located in the groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a perspective view of a coated tool showing a non-limiting aspect of the present invention.

[0009] Figure 2 yes Figure 1 A schematic diagram of a cross section near the interface between the substrate and the coating layer in a coated tool is shown.

[0010] Figure 3 This is a cross-sectional view of the vicinity of the surface of a coated tool showing one non-limiting aspect of the present invention.

[0011] Figure 4 This is a cross-sectional view of the vicinity of the surface of a coated tool showing one non-limiting aspect of the present invention.

[0012] Figure 5 It is a perspective view of a cutting tool showing a non-limiting aspect of the present invention. DETAILED DESCRIPTION

[0013] <Coated tools>

[0014] Hereinafter, the coated tool 1 of one aspect of the present invention which is not limited will be described in detail using the accompanying drawings. However, in the following referenced figures, for the sake of convenience of description, only the main components necessary for describing the embodiment are simplified. Therefore, the coated tool 1 can have any constituent components not shown in the referenced figures. In addition, the dimensions of the components in the figures do not accurately represent the dimensions of the actual constituent components and the dimensional ratios of the components. These points are also the same in the cutting tools described later.

[0015] Coated tool 1 Figure 1 as well as Figure 2 As shown in the non-limiting example, the substrate 3 and the coating layer 7 (coating film layer) located on the surface 5 of the substrate 3 may be included.

[0016] The substrate 3 may also have a coating film binder phase 9. The coating film binder phase 9 may also be a part of the substrate 3. The coating film binder phase 9 may also contain at least one metal compound selected from carbides, nitrides, and carbonitrides containing Ti (titanium) and W (tungsten), and Co (cobalt).

[0017] The coating film binding phase 9 may also contain a metal compound and Co as main components. "Main component" may also mean a component having the largest mass % value compared to other components. Therefore, in the coating film binding phase 9, the total value of the mass % of the metal compound and Co may also be the largest. In addition, the top two values ​​of the mass % of the components contained in the coating film binding phase 9 may also be metal compounds and Co.

[0018] Elemental analysis can also be performed, for example, by energy dispersive X-ray spectroscopy (EDS). Elemental analysis can also be performed by cross-sectional observation using EDS attached to an electron microscope. Examples of electron microscopes include scanning electron microscopes (SEM) and transmission electron microscopes (TEM).

[0019] Here, the coating is combined with the phase 9 as Figure 2 As shown in the non-limiting example, it can also be located at the interface S between the substrate 3 and the coating layer 7. The coating film bonding phase 9 having the above-mentioned composition can function as a phase that improves the bonding property with the coating layer 7 in the substrate 3. Therefore, when the coating film bonding phase 9 is located at the interface S between the substrate 3 and the coating layer 7, the bonding property of the substrate 3 and the coating layer 7 is easily improved. Therefore, in the coated tool 1, the bonding property of the substrate 3 and the coating layer 7 is high. In addition, the wear resistance of the coated tool 1 is high.

[0020] The matrix 3 may also have a hard phase 11 , a solid solution phase 13 , and a binder phase 15 .

[0021] The hard phase 11 may contain W and C. In other words, the hard phase 11 may contain WC. The hard phase 11 also contains WC as a main component. W and C may be the top two components in terms of mass % of the components contained in the hard phase 11.

[0022] The solid solution phase 13 may also contain W, C and Ti. The solid solution phase 13 may also contain W, C and Ti as main components. That is, in the solid solution phase 13, the total value of the mass % of each of W, C and Ti may also be the largest. In addition, the top three values ​​of the mass % of the components contained in the solid solution phase 13 may also be W, C and Ti.

[0023] The binding phase 15 may also contain an iron group metal. Examples of the iron group metal include Co and Ni (nickel). The binding phase 15 may also contain at least one of Co and Ni. The binding phase 15 may also contain an iron group metal as a main component. The binding phase 15 may function as a phase that binds the adjacent hard phases 11.

[0024] The matrix 3 may also be a cemented carbide having a hard phase 11, a solid solution phase 13, and a binder phase 15. The coating bonding phase 9 may also have a higher content of β component and Co than the binder phase 15. In these cases, the fracture resistance is easily improved. It should be noted that the content of β component and Co in the coating bonding phase 9 may also be 50 to 95% by mass. The content of β component and Co in the binder phase 15 may also be 20 to 60% by mass. "The content of β component and Co" means the sum of the content of β component and the content of Co.

[0025] Examples of the β component include Ti and the like. The compositions of the hard phase 11, the solid solution phase 13, and the binder phase 15 can be measured by, for example, EDS. The measurement can also be performed using EDS attached to an electron microscope.

[0026] like Figure 2As shown in the non-limiting example, in the cross section perpendicular to the surface 5 of the substrate 3, the coating film bonding phase 9 may also be in a wavy shape. In this case, the fracture resistance is easily improved. It should be noted that in the above-mentioned cross section, the coating film bonding phase 9 may also be in contact with the hard phase 11 at the opposite side of the interface S. The portion of the coating film bonding phase 9 in contact with the hard phase 11 may also be in a wavy shape.

[0027] The average thickness of the coating film binder phase 9 may be 0.05 to 0.5 μm. In this case, the fracture resistance is likely to be improved.

[0028] The thickness of the coating film binder 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 film binder phase 9 and the average value may be calculated.

[0029] like Figure 2 As shown in the non-limiting example, the coating film bonding phase 9 may be formed at 2-7% of the interface S between the substrate 3 and the coating layer 7 in the cross section perpendicular to the surface 5 of the substrate 3. In this case, the bonding property between the substrate 3 and the coating layer 7 is easily improved.

[0030] like Figure 2 As shown in the non-limiting example, in the cross section perpendicular to the surface 5 of the substrate 3 , the coating binder phase 9 may be discontinuous in the direction along the interface S. In this case, the fracture resistance is likely to be improved.

[0031] In the case where the coating film bonding phase 9 is discontinuous, the hard phase 11 may also be located between adjacent coating film bonding phases 9. Adjacent coating film bonding phases 9 may also be in contact with the hard phase 11 located therebetween. It should be noted that the coating film bonding phase 9 is not limited to a discontinuous structure along the direction of the interface S. The coating film bonding phase 9 may also be continuous along the direction of the interface S.

[0032] The composition of the matrix 3 may contain Nb (niobium). In this case, the wear resistance of the coated tool 1 tends to be high. It should be noted that the content of Nb in the matrix 3 may be 0.1 to 3 mass %.

[0033] 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 the β phase 17 and the binder phase 15. In this case, the wear resistance of the coated tool 1 tends to be high.

[0034] The β phase 17 may be a complex carbide including 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.

[0035] The coating layer 7 may be located on the entire surface 5 of the base 3 or only on a portion of the surface 5 of the base 3. That is, the coating layer 7 may be located on at least a portion of the surface 5 of the base 3.

[0036] The coating layer 7 may also be formed by chemical vapor deposition (CVD). In other words, the coating layer 7 may also be a CVD film. It should be noted that the coating layer 7 may also be a PVD film formed by physical vapor deposition (PVD).

[0037] The coating layer 7 may be a single-layer structure or a structure in which a plurality of layers are stacked. Examples of the composition of the coating layer 7 include TiCN (titanium carbonitride), Al 2 O 3 (aluminum oxide), and TiN (titanium nitride).

[0038] Coating layer 7 such as Figure 3 As shown in the non-limiting example, the TiCN layer 19 and the Al2O3 layer 21 may be provided in this order from the substrate 3. 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.

[0039] Coating layer 7 such as Figure 4 As shown in the non-limiting example, the substrate 3 may include a TiN layer 23, a TiCN layer 19, and an Al2O3 layer 21 in this order. 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.

[0040] The coating layer 7 is not limited to a specific thickness. For example, the average thickness of the TiCN layer 19 can also be set to about 1 to 15 μm. The average thickness of the Al2O3 layer 21 can also be set to about 1 to 15 μm. The average thickness of the TiN layer 23 can also be set to about 0.1 to 5 μm. The thickness of the coating layer 7 can also be measured by cross-sectional observation using an electron microscope. For example, the thickness can be measured at more than 10 measurement points at any position of each layer, and the average value can be calculated.

[0041] exist Figure 1 In the drawings, a cutting insert is shown as a non-limiting example of the coated tool 1. It should be noted that the coated tool 1 is not limited to the cutting insert.

[0042] The coated tool 1 may include a first surface 25 (upper surface), a second surface 27 (side surface) adjacent to the first surface 25 , and a cutting edge 29 located at least in a portion of a ridgeline between the first surface 25 and the second surface 27 .

[0043] The first surface 25 may be a rake face. The first surface 25 may be the entire rake face, or a portion thereof may be the rake face. For example, a region along the cutting edge 29 of the first surface 25 may be the rake face.

[0044] The second surface 27 may be a flank surface. The entire second surface 27 may be a flank surface, or a portion thereof may be a flank surface. For example, a region along the cutting edge 29 of the second surface 27 may be a flank surface.

[0045] The cutting edge 29 may be located at a part of the ridgeline portion, or may be located at the entire ridgeline portion. The cutting edge 29 can be used for cutting the workpiece. It should be noted that the coating film bonding phase 9 may also 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 difficult to collapse.

[0046] The coated tool 1 may also have a through hole 31. The through hole 31 can be used to install a fixing screw or a clamping member when the coated tool 1 is held in the tool holder. The through hole 31 may also be formed from the first surface 25 to the surface (lower surface) located on the opposite side of the first surface 25, and may also be opened on these surfaces. It should be noted that there is no problem with the structure in which the through hole 31 is opened in the mutually opposing regions of the second surface 27.

[0047] The coated tool 1 may also be in the shape of a square plate. It should be noted that the shape of the coated tool 1 is not limited to the shape of a square plate. For example, the first surface 25 may also be in the shape of a triangle, a pentagon, a hexagon or a circle.

[0048] 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. In addition, the height from the first surface 25 to the surface (lower surface) on the opposite side of the first surface 25 may be set to about 5 to 20 mm.

[0049] <Method for manufacturing coated cutting tools>

[0050] Next, a method for manufacturing a coated tool according to a non-limiting aspect of the present invention will be described by taking a case where the coated tool 1 is manufactured as an example.

[0051] When manufacturing the coated tool 1, the substrate 3 may be prepared first. As the substrate 3, a substrate 3 made of cemented carbide is used as an example for explanation. First, as raw material powder, WC powder, TiC powder, TaC powder, ZrC powder, Co powder, NbC powder, etc. may be prepared.

[0052] 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.

[0053] The average particle size of the raw material powder may be appropriately selected within the range of 0.1 to 10 μm. The average particle size of the raw material powder may be a value measured by the Microtrack method.

[0054] The prepared raw material powders may be mixed and molded to obtain a molded body. Examples of the molding method include press molding, casting molding, extrusion molding, and cold isostatic pressing.

[0055] The obtained molded body may be subjected to dewaxing treatment and then sintered. The sintering may be performed in a non-oxidizing atmosphere such as vacuum, argon atmosphere, and nitrogen atmosphere. The sintering temperature may be 1450 to 1600° C. The sintering time may be 0.5 to 3 hours.

[0056] It is also possible to cool after sintering to obtain a substrate 3 composed of cemented carbide. In this case, the cooling rate may be set to 6 to 20°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 easily contained in the β phase 17, the binder phase 15, or both the β phase 17 and the binder phase 15.

[0057] In addition, a holding process may also be provided during cooling. It should be noted that the "holding process" is a process that can be added to the cooling process shown in the upper paragraph. In this cooling process, the sintered body is not cooled monotonously at a prescribed cooling rate, but a process for maintaining the temperature of the sintered body for a constant time may be included. The process for maintaining the temperature of the sintered body is set as a "holding process". However, maintaining the temperature of the sintered body does not require that the temperature be kept constant in a strict sense. As long as the value obtained by dividing the temperature difference before and after the "holding process" by the time for performing the holding process is smaller than the prescribed cooling rate, it can also be regarded as maintaining the temperature of the sintered body. In this case, it is easy to make the substrate 3 have a coating bonding phase 9. The holding process may also be performed under the following conditions.

[0058] Time: 0.5 to 2 hours

[0059] Temperature: 800~1000℃

[0060] Pressure: 5~10kPa

[0061] Atmosphere: Hydrogen atmosphere

[0062] For example, when the sintered body is cooled with the cooling rate set to 10°C / min, a holding process is added. As the conditions of the holding process at this time, the setting temperature is set to 900°C, the temperature at the start is 930°C, the temperature at the end is 870°C, and the time is 1 hour (=60 minutes). The rate of temperature change in the holding process is 1 [= (930-870) / 60] (°C / min), which is smaller than the cooling rate of 10°C / min (°C / min). Therefore, in the above, it can be said that a holding process is provided during cooling.

[0063] Next, the coating layer 7 may be formed on the surface 5 of the obtained base body 3 by CVD method to obtain the coated tool 1 .

[0064] The TiCN layer 19 can also be formed as follows. First, as a reaction gas composition, a mixed gas consisting of 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 can also be adjusted. In addition, the mixed gas can be introduced into the furnace, the temperature is set to 800 to 1100°C, and the pressure is set to 5 to 30 kPa to form the TiCN layer 19.

[0065] The Al2O3 layer 21 can also be formed as follows. First, as a reaction gas composition, a mixed gas consisting of 0.5 to 5 volume % aluminum chloride (AlCl3) gas, 0.5 to 3.5 volume % hydrogen chloride (HCl) gas, 0.5 to 5 volume % carbon dioxide (CO2) gas, 0.5 volume % or less hydrogen sulfide (H2S) gas, and the rest hydrogen (H2) gas can also be adjusted. In addition, the mixed gas can be introduced into the furnace, the temperature is set to 930 to 1010°C, and the pressure is set to 5 to 10 kPa to form the Al2O3 layer 21.

[0066] The TiN layer 23 can also be formed as follows. First, as a reaction gas composition, a mixed gas consisting of 0.1 to 10 volume % of titanium tetrachloride (TiCl4) gas, 10 to 60 volume % of nitrogen (N2) gas, and the remainder of hydrogen (H2) gas can be adjusted. In addition, the mixed gas can be introduced into the furnace, the temperature is set to 800 to 1010°C, and the pressure is set to 10 to 85 kPa to form the TiN layer 23.

[0067] It should be noted that the above-mentioned manufacturing method is an example of a method for manufacturing the coated tool 1. Therefore, the coated tool 1 is of course not limited to the coated tool manufactured by the above-mentioned manufacturing method.

[0068] <Cutting tools>

[0069] Next, a cutting tool 101 which is one non-limiting aspect of the present invention will be described with reference to the drawings, taking as an example a case where the coated tool 1 described above is provided.

[0070] Cutting tool 101 Figure 5 As shown in the non-limiting example, it can also include: a tool holder 103, which extends from the first end 103a toward the second end 103b and has a tool groove 105 on the first end 103a side; and a coated tool 1, which is located in the tool groove 105. In the case where the cutting tool 101 includes the coated tool 1, the coated tool 1 has high wear resistance, so stable cutting can be performed.

[0071] The knife groove 105 may also be a portion for assembling the coated tool 1. The knife groove 105 may also be open on the outer peripheral surface of the knife handle 103 and the end surface on the first end 103a side.

[0072] The coated tool 1 may be mounted on the knife groove 105 in a manner that the cutting edge 29 protrudes outward from the tool holder 103. In addition, the coated tool 1 may be mounted on the knife groove 105 by means of a fixing screw 107. That is, the coated tool 1 may be mounted on the knife groove 105 by inserting the fixing screw 107 into the through hole 31 of the coated tool 1, inserting the front end of the fixing screw 107 into the threaded hole formed in the knife groove 105, and screwing the threaded parts together. At this time, the lower surface of the coated tool 1 may be in direct contact with the knife groove 105, or a sheet may be sandwiched between the coated tool 1 and the knife groove 105.

[0073] Examples of the material of the handle 103 include steel and cast iron. When the material of the handle 103 is steel, the handle 103 has high toughness.

[0074] exist Figure 5In the example shown, a cutting tool 101 used for so-called turning processing is illustrated. As turning processing, for example, inner diameter processing, outer diameter processing, and grooving processing can be cited. It should be noted that the use of the cutting tool 101 is not limited to turning processing. For example, there is no problem in using the cutting tool 101 for milling processing.

[0075] As mentioned above, the coated tool 1 and the cutting tool 101 which are non-limiting aspects of the present invention are exemplified, but the present invention is not limited to the above-mentioned embodiments, and any embodiment is possible as long as it does not depart from the gist of the present invention.

[0076] For example, in the above-mentioned non-limiting embodiment, the coated tool 1 is used as a cutting tool 101 as an example, but the coated tool 1 can also be applied to other uses. Other uses include lubricating parts, wear-resistant parts such as molds, tools such as excavating tools and cutting tools, and impact-resistant parts.

[0077] In addition, the coated tool 1 and the cutting tool 101 may have the following structures.

[0078] (1) A coated tool comprises a substrate and a coating layer located on the surface of the substrate, wherein the substrate has a coating bonding phase, the coating bonding phase contains at least one metal compound selected from carbides, nitrides, and carbonitrides containing Ti and W, and Co, and the coating bonding phase is located at the interface between the substrate and the coating layer.

[0079] (2) The coated tool of (1) above may be a tool wherein the substrate is a cemented carbide 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 binder phase contains a larger content of β component and Co than the binder phase.

[0080] (3) In the coated tool described in (1) or (2) above, the coating film binder phase may be wavy in a cross section perpendicular to the surface of the substrate.

[0081] (4) In any of the coated cutting tools described in (1) to (3) above, the average thickness of the coating film binder phase may be 0.05 to 0.5 μm.

[0082] (5) In any of the coated cutting tools described in (1) to (4) above, the coating film binder phase may be formed at 20% to 70% of the interface between the substrate and the coating layer in a cross section perpendicular to the surface of the substrate.

[0083] (6) In any one of the coated cutting tools described in (1) to (5) above, the composition of the matrix may contain Nb.

[0084] (7) The coated tool of (6) above may be a hard 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, wherein the base body also has a β phase, and the Nb is contained in the β phase, the binder phase, or both the β phase and the binder phase.

[0085] (8) In any one of the coated cutting tools described in (1) to (7) above, the coating layer may include a TiCN layer and an Al 2 O 3 layer in that order from the substrate.

[0086] (9) In any one of the coated cutting tools described in (1) to (7) above, the coating layer may include a TiN layer, a TiCN layer, and an Al 2 O 3 layer in this order from the substrate.

[0087] (10) The cutting tool may include: a tool holder extending from a first end toward a second end and having a tool groove on the first end side; and the coated tool according to any one of (1) to (9) above, which is located in the tool groove.

[0088] Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited to the following Examples.

[0089] Example

[0090] [Sample No. 1-2]

[0091] <Manufacturing of coated tools>

[0092] First, as raw material powders, 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. The average particle size of the raw material powders is a value measured by the Michick method.

[0093] Next, the raw material powders were mixed so that the composition of the coating binder phase in the sintered body became composition A or composition B in Table 1, and the formed body was obtained by stamping into a cutting tool shape (CNMG120408). After the obtained formed body was dewaxed, it was kept at a temperature of 1450 to 1600°C for 0.5 to 2 hours and sintered. And, after sintering, it was cooled to obtain a matrix composed of cemented carbide. At this time, the cooling rate was set to the conditions shown in Table 2.

[0094] In addition, a holding step is provided during cooling. The holding step is performed under the following conditions.

[0095] Time: 1 hour

[0096] Temperature: 850℃

[0097] Pressure: 7.5kPa

[0098] Atmosphere: Hydrogen atmosphere

[0099] The coating layer was formed on the surface of the obtained substrate by CVD method to obtain the coated tool shown in Table 2. The coating layer was formed in order from the substrate side with a TiN layer having an average thickness of 1 μm, a TiCN layer having an average thickness of 10 μm, and an Al2O3 layer having an average thickness of 5 μm.

[0100] The composition of the matrix was measured by EDS. Specifically, it was performed by cross-sectional observation using EDS attached to SEM. Three random locations were measured at a magnification of 5000 to 20000 times, and the average value was calculated.

[0101] The results of EDS measurement showed that the obtained substrates all had a hard phase containing W and C as main components, a solid solution phase containing W, C and Ti as main components, and a binder phase containing an iron group metal (Co) as main component. In addition, the substrate had a coating binder phase of composition A or composition B in Table 1. The coating binder phase was located at the interface between the substrate and the coating layer. The coating binder phase contained more β component (Ti) and Co than the binder phase.

[0102] In a cross section perpendicular to the surface of the substrate, the coating film binder phase is wavy in shape. More specifically, in the cross section, the portion of the coating film binder phase opposite to the interface is in contact with the hard phase. The portion of the coating film binder phase in contact with the hard phase is wavy in shape.

[0103] The average thickness of the coating film bonding phase was 0.2 μm. In the above cross section, the coating film bonding phase formed 60% of the interface.

[0104] The matrix obtained with composition A contains Nb and has a β phase. The composition of the β phase was measured by EDS and found to be (W, Ti, Nb, Ta, Zr) C. Nb is contained in the β phase and the binder phase.

[0105] [Sample No. 3]

[0106] The cooling rate is set to the conditions shown in Table 2. Except that no holding process is set during cooling, the substrate is prepared under the same conditions as sample No. 1. The coating layer same as sample No. 1 is formed on the surface of the substrate by CVD method to obtain the coated tool shown in Table 2.

[0107] The composition of the matrix was measured by EDS under the same conditions as for Samples No. 1 and 2. As a result, the obtained matrix had a hard phase containing W and C as main components, a solid solution phase containing W, C and Ti as main components, and a binder phase containing an iron group metal (Co) as a main component, but did not have a coating binder phase.

[0108] <Evaluation>

[0109] The obtained coated cutting tools were evaluated for cutting performance under the following conditions.

[0110] Processing form: Turning

[0111] Cutting speed: 150m / min

[0112] Feed: 0.4mm / rev

[0113] Cutting depth: 0.5mm

[0114] Workpiece: SCM435 φ200 round bar (4 slots)

[0115] Processing state: wet

[0116] Others: The measurement was performed with n=4, and the average value was calculated.

[0117] The evaluation results are shown in Table 2. In the evaluation results of Table 2, "the number of impacts until the blade edge is broken" indicates the number of impacts until the blade edge is broken during cutting, and can also be called an intermittent performance evaluation.

[0118] [Table 1]

[0119]

[0120] [Table 2]

[0121]

[0122] Samples No. 1 and 2 have higher wear resistance of the cutting edge than Sample No. 3, and can perform stable cutting as a cutting tool.

[0123] Description of Reference Numerals

[0124] 1 Coated tools

[0125] 3 Matrix

[0126] 5 Surface

[0127] 7 Coating layer (film layer)

[0128] 9 Coating bonding phase

[0129] 11 Hard phase

[0130] 13 Solid solution phase

[0131] 15 Adhesive phase

[0132] 17 β phase

[0133] 19 TiCN layer

[0134] 21 Al2O3 layer

[0135] 23 TiN layer

[0136] 25 First side (upper surface)

[0137] 27 Second side (side)

[0138] 29 Cutting Edge

[0139] 31 Through hole

[0140] 101 Cutting Tools

[0141] 103 Handle

[0142] 103a First End

[0143] 103b Second end

[0144] 105 Slot

[0145] 107 Fixing screw

[0146] S interface.

Claims

1. A coated tool, comprising a substrate and a coating layer located on the surface of the substrate, wherein: The substrate has a coating film bonding phase, and the coating film bonding phase contains at least one metal compound selected from carbides, nitrides, and carbonitrides containing Ti and W, and Co. The coating film bonding phase is located at the interface between the substrate and the coating layer.

2. The coated tool according to claim 1, wherein: The matrix is ​​a cemented carbide 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. The coating film bonding phase contains a larger content of β component and Co than the binder phase.

3. The coated tool according to claim 1 or 2, wherein: The coating film binder phase has a wavy shape in a cross section perpendicular to the surface of the substrate.

4. The coated tool according to any one of claims 1 to 3, wherein: The average thickness of the coating film bonding phase is 0.05 to 0.5 μm.

5. The coated tool according to any one of claims 1 to 4, wherein: In a cross section perpendicular to the surface of the substrate, the coating film binder phase is formed at 20% to 70% of the interface between the substrate and the coating layer.

6. The coated tool according to any one of claims 1 to 5, wherein: The composition of the matrix contains Nb.

7. The coated tool according to claim 6, wherein: The matrix is ​​a cemented carbide 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. The matrix also has a β phase, The Nb is contained in the β phase, the binder phase, or both the β phase and the binder phase.

8. The coated tool according to any one of claims 1 to 7, wherein: The coating layer includes a TiCN layer and an Al 2 O 3 layer in order from the substrate side.

9. The coated tool according to any one of claims 1 to 7, wherein: The coating layer includes a TiN layer, a TiCN layer, and an Al 2 O 3 layer in order from the substrate side.

10. A cutting tool, wherein: The cutting tool has: a knife handle extending from a first end toward a second end and having a knife groove on a side of the first end; and The coated cutting tool according to any one of claims 1 to 9, which is located in the cutting groove.

Images