COATED TOOL AND CUTTING TOOL

Abstract

A coated tool in one non-limiting embodiment of the present disclosure includes a base body and a coating layer disposed on a surface of the base body. The base body includes a coating adhesion phase containing at least one type of metal compound selected from carbide, nitride, and carbonitride, each of which includes Ti, W, and Co. The coating adhesion phase is disposed at a boundary between the base body and the coating layer. A cutting tool in one non-limiting embodiment of the present disclosure includes a holder extending from a first end to a second end and having a pocket on a side of the first end, and the coated tool is disposed in the pocket.

Description

REFERENCE TO RELATED APPLICATION

[0001] This application claims priority to Japanese Patent Application No. 2022-116251, filed on July 21, 2022. The contents of this application are hereby incorporated by reference in their entirety. TECHNICAL FIELD

[0002] The present disclosure relates to a coated tool and a cutting tool. BACKGROUND

[0003] Cemented carbide containing WC (tungsten carbide) as a hard phase is used for a base body, etc., in a coated tool, and is used in a cutting tool such as an end mill. For example, Japanese Unexamined Patent Publication No. 2004-100004 (Patent Document 1) describes a coated cemented carbide having a layered coating adhesion phase formed between a coating layer and a cemented carbide base material. The coating adhesion phase is formed of at least one type of metal compound selected from carbide, nitride, and carbonitride, each of which contains Ti and W.

[0004] Japanese Unexamined Patent Publication No. 1-252306 (Patent Document 2) describes a cutting tool in which a coating layer is formed on a surface of a cemented carbide base body by interposing an adhesion-enhancing layer therebetween. The adhesion-enhancing layer is composed of a lower layer containing Co and W in predetermined individual proportions and the balance titanium carbide, an intermediate layer composed of titanium carbonitride, etc., and an upper layer composed of titanium carbide. BRIEF EXPLANATION

[0005] A coated tool in one non-limiting embodiment of the present disclosure includes a base body and a coating layer disposed on a surface of the base body. The base body includes a coating adhesion phase containing at least one type of metal compound selected from carbide, nitride, and carbonitride, each of which includes Ti, W, and Co. The coating adhesion phase is disposed at a boundary between the base body and the coating layer.

[0006] A cutting tool in one non-limiting embodiment of the present disclosure includes a holder extending from a first end to a second end and having a pocket on a side of the first end, and the coated tool disposed in the pocket. BRIEF DESCRIPTION OF THE DRAWINGS Fig.1 is a perspective view showing a coated tool in a non-limiting embodiment of the present disclosure, Fig. 2 is a schematic diagram of a cross section near a boundary between a base body and a coating layer in the Fig. 1 coated tool shown, Fig. 3 is a sectional view showing a vicinity of a surface of a coated tool in a non-limiting embodiment of the present disclosure, Fig. 4 is a sectional view showing a vicinity of a surface of a coated tool in a non-limiting embodiment of the present disclosure, and Fig. 5 is a perspective view showing a cutting tool in a non-limiting embodiment of the present disclosure. EMBODIMENT<Beschichtetes Werkzeug>

[0007] A coated tool 1 in a non-limiting embodiment of the present disclosure will be described in detail below with reference to the drawings. For convenience of description, the following drawings show, in a simplified form, only the main elements necessary for describing the embodiments. Therefore, the coated tool 1 may include any structural element not shown in the above-mentioned drawings. The dimensions of the elements in the drawings do not faithfully reflect the dimensions of the actual structural elements or the dimensional relationships of these elements. These points also apply to a cutting tool described later.

[0008] The coated tool 1 may comprise a base body 3 and a coating layer 7 (layer) arranged on a surface 5 of the base body 3, as shown in a non-limiting embodiment shown in the Fig. 1 and Fig. 2 is shown.

[0009] The base body 3 may have a coating adhesion phase 9. The coating adhesion phase 9 may be a part of the base body 3. The coating adhesion phase 9 may have at least one type of metal compound selected from carbide, nitride, and carbonitride, each of which contains Ti (titanium), W (tungsten), and Co (cobalt).

[0010] The coating adhesion phase 9 may contain the metal compound and Co as a main component. The term "main component" used herein may refer to a component with the largest mass percentage compared to other components. Accordingly, a total value of the metal compound and Co may be the largest in the coating adhesion phase 9. The metal compound and Co may be the components with the two highest mass percentages among the components contained in the coating adhesion phase 9.

[0011] Elemental analysis can be performed, for example, using energy-dispersive X-ray spectroscopy (EDS). Elemental analysis can be performed by cross-sectional observation using an EDS included in an electron microscope. Examples of electron microscopes include scanning electron microscopes (SEM) and transmission electron microscopes (TEM).

[0012] The coating adhesion phase 9 may be arranged at a boundary S between the base body 3 and the coating layer 7, as in the non-limiting embodiment shown in Fig. 2. The coating adhesion phase 9 having the above composition can serve in the base body 3 as a phase that improves adhesion to the coating layer 7. Therefore, when the coating adhesion phase 9 is disposed at the boundary S between the base body 3 and the coating layer 7, it is easy to improve the adhesion between the base body 3 and the coating layer 7. Therefore, the coated tool 1 has improved adhesion between the base body 3 and the coating layer 7. The coated tool 1 also has high wear resistance.

[0013] The base body 3 can have a hard phase 11, a solid solution phase 13 and a binder phase 15.

[0014] 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 major component. Components with the two highest mass percentages among the components contained in the hard phase 11 may be W and C.

[0015] The solid solution phase 13 may contain W, C, and Ti. The solid solution phase 13 may contain W, C, and Ti as a major component. That is, a total mass percentage of each of W, C, and Ti may be the largest in the solid solution phase 13. Components with the three highest mass percentages among the components contained in the solid solution phase 13 may be W, C, and Ti.

[0016] The binder phase 15 may contain an iron group metal. Examples of the iron group metal include Co and Ni (nickel). The binder phase 15 may contain at least one of Co and Ni. The binder phase 15 may contain the iron group metal as a main component. The binder phase 15 may serve as a phase connecting the adjacent hard phases 11.

[0017] The base body 3 may be cemented carbide comprising the hard phase 11, the solid solution phase 13, and the binder phase 15. The coating adhesion phase 9 may have a larger content of each of a β-component and Co than the binder phase 15. These embodiments promote the improvement of fracture toughness. The content of each of the β-component and Co in the coating adhesion phase 9 may be 50-95 mass%. The content of the β-component and Co in the binder phase 15 may be 20-60 mass%. The term "content of each of the β-component and Co" means a sum of the content of the β-component and the content of Co.

[0018] Examples of the β-component may include Ti. Individual compositions of the hard phase 11, the solid solution phase 13, and the binder phase 15 can be measured, for example, by EDS. Measurements can be performed using an EDS included in an electron microscope.

[0019] The coating adhesion phase 9 may have a wavy shape in a cross-section perpendicular to the surface 5 of the base body 3, as in the non-limiting embodiment shown in Fig. 2. This embodiment promotes the improvement of fracture strength. In the above cross section, a part of the coating adhesion phase 9 on a side opposite the boundary S may be in contact with the hard phase 11. The part in the coating adhesion phase 9 that is in contact with the hard phase 11 may have a wavy shape.

[0020] The coating adhesion phase 9 can have an average thickness of 0.05 to 0.5 µm. This embodiment promotes improved fracture toughness.

[0021] The thickness of the coating adhesion phase 9 can be measured by cross-sectional observation using an electron microscope. For example, the thickness can be measured at five or more measuring points at any position of the coating adhesion phase 9, and an average value thereof can be calculated.

[0022] The coating adhesion phase 9 may be formed in the cross-section perpendicular to the surface 5 of the base body 3 in 20-70% of the boundary S between the base body 3 and the coating layer 7, as in the non-limiting embodiment shown in Fig. 2. This embodiment promotes the improvement of the adhesion between the base body 3 and the coating layer 7.

[0023] The coating adhesion phase 9 may be discontinuous in cross-section perpendicular to the surface 5 of the base body 3 in a direction along the boundary S, as in the non-limiting embodiment shown in Fig. 2. This embodiment promotes the improvement of fracture strength.

[0024] When the coating adhesion phase 9 is discontinuous, the hard phase 11 may be disposed between the coating adhesion phases 9 that are adjacent to each other. The adjacent coating adhesion phases 9 may be in contact with the intervening hard phase 11. The coating adhesion phase 9 is not limited to the configuration in which the coating adhesion phase 9 is discontinuous in the direction along the boundary S. The coating adhesion phase 9 may be continuous in the direction along the boundary S.

[0025] The composition of the base body 3 may include Nb (niobium). This embodiment promotes the improvement of the wear resistance of the coated tool 1. The Nb content in the base body 3 may be 0.1-3 mass%.

[0026] The base body 3 may be cemented carbide comprising the hard phase 11, the solid solution phase 13, and the binder phase 15. The base body 3 may further comprise a β-phase 17. The Nb may be contained in the β-phase 17 or the binder phase 15, or in both. This embodiment promotes the improvement of the wear resistance of the coated tool 1.

[0027] The β-phase 17 may be a composite carbide containing at least one of Ti, Nb, Ta (tantalum), and Zr (zirconium), and W. A composition of the β-phase 17 can be measured, for example, by EDS.

[0028] The coating layer 7 can be arranged on all or part of the surface 5 of the base body 3. That is, the coating layer 7 can be arranged on at least part of the surface 5 of the base body 3.

[0029] The coating layer 7 can be deposited by the chemical vapor deposition (CVD) method. In other words, the coating layer 7 can be a CVD layer. Alternatively, the coating layer 7 can be a PVD layer deposited by the physical vapor deposition (PVD) method.

[0030] The coating layer 7 may be configured as a single layer or a plurality of laminated layers. Examples of the composition of the coating layer 7 may be TiCN (titanium carbonitride), Al 2 O 3 (aluminum oxide) and TiN (titanium nitride).

[0031] The coating layer 7 may comprise a TiCN layer 19 and an Al 2 O 3 -layer 21 in the order from one side of the base body 3, as in a non-limiting embodiment shown in Fig. 3. The TiCN layer 19 can be in contact with the base body 3. The Al 2 O 3 -Layer 21 can be in contact with the TiCN layer 19.

[0032] The coating layer 7 may comprise a TiN layer 23, a TiCN layer 19 and an Al 2 O 3 -layer 21 from one side of the base body 3, as in a non-limiting embodiment shown in Fig. 4. The TiN layer 23 may be in contact with the base body 3. The TiCN layer 19 may be in contact with the TiN layer 23. The Al 2 O 3 -Layer 21 can be in contact with the TiCN layer 19.

[0033] The coating layer 7 is not limited to a specific thickness. For example, an average thickness of the TiCN layer 19 may be set to about 1-15 µm. An average thickness of the Al 2 O 3 The thickness of the TiN layer 21 may be set to approximately 1-15 µm. The average thickness of the TiN layer 23 may be set to approximately 0.1-5 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 measuring points at any position of each layer, and an average value may be calculated.

[0034] Fig. 1 shows a cutting insert as a non-limiting embodiment of the coated tool 1. The coated tool 1 is not limited to the cutting insert.

[0035] 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 disposed on at least a portion of a ridge line of the first surface 25 and the second surface 27.

[0036] The first surface 25 may be a rake face. The first surface 25 may be the rake face in whole or in part. For example, a region along the cutting edge 29 in the first surface 25 may be the rake face.

[0037] The second surface 27 may be a flank surface. The second surface 27 may be the flank surface in whole or in part. For example, a region along the cutting edge 29 in the second surface 27 may be the flank surface.

[0038] The cutting edge 29 can be arranged on part or all of the ridge line. The cutting edge 29 can be used for machining a workpiece. The coating adhesion phase 9 can be arranged at the boundary S between the base body 3 and the coating layer 7, where the cutting edge 29 is arranged. With this embodiment, the cutting edge 29 is less susceptible to fracture.

[0039] The coated tool 1 may have a through-hole 31. The through-hole 31 may be used for attaching a fastening screw or a clamping element when the coated tool 1 is held in a holder. The through-hole 31 may be formed from the first surface 25 to a surface (bottom surface) located on a side opposite to the first surface 25. The through-hole 31 may also open into these surfaces. It is not problematic even if the through-hole 31 is configured to open into areas opposite to each other in the second surface 27.

[0040] The coated tool 1 may have a quadrangular plate shape. The shape of the coated tool 1 is not limited to the quadrangular plate shape. For example, the first surface 25 may have a triangular shape, a pentagonal shape, a hexagonal shape, or a circular shape.

[0041] The coated tool 1 is not limited to specific dimensions. For example, a length of one side of the first surface 25 may be set to approximately 3 to 20 mm. A height from the first surface 25 to the surface (lower surface) on the side opposite to the first surface 25 may be set to approximately 5 to 20 mm. <Verfahren zur Herstellung eines beschichteten Werkzeugs>

[0042] A method of manufacturing a coated tool in a non-limiting embodiment of the present disclosure will be described below by illustrating the case of manufacturing the coated tool 1.

[0043] In the manufacture of the coated tool 1, a base body 3 may be prepared first. A description will be given based on the example in which a base body 3 formed of cemented carbide is prepared as the base body 3. First, WC powder, TiC powder, TaC powder, ZrC powder, Co powder, and NbC powder may be prepared as raw material powder.

[0044] The proportion of TiC powder can be 0.5–5 mass%. The proportion of TaC powder can be 0.1–5 mass%. The proportion of ZrC powder can be 0.2–5 mass%. The proportion of Co powder can be 4–15 mass%. The proportion of NbC powder can be 0.1–3 mass%. The remainder can be WC powder.

[0045] The average particle diameters of the raw material powders can be suitably selected within a range of 0.1 to 10 µm. The average particle diameters of the raw material powders can be values ​​measured by the micro-track method.

[0046] A molded article can be obtained by mixing the prepared raw material powders and then molding. Examples of molding processes include compression molding, casting molding, extrusion molding, and cold isostatic pressing.

[0047] The resulting molded body can be subjected to debinding treatment and then sintered. Sintering can be carried out in a non-oxidizing atmosphere, such as vacuum, argon, or nitrogen. The sintering temperature can be 1450-1600 °C. The sintering time can be 0.5-3 hours.

[0048] The cemented carbide base body 3 can be obtained by sintering and subsequent cooling. The cooling rate can be set at 6-20 °C / min. More specifically, the cooling rate can be set at 6-15 °C / min. When NbC powder is used as the raw material powder and cooling is carried out at the above-mentioned cooling rate, the Nb contained in the composition of the base body 3 can be easily incorporated into the β-phase 17 or the binder phase 15, or both.

[0049] Additionally, a holding step may be added during cooling. The term "holding step" used here refers to the step that can be added to a cooling step described in the previous section. The cooling step may include the process of maintaining a temperature of a sintered body for a certain time, instead of monotonously cooling the sintered body at a predetermined cooling rate. Maintaining the temperature of the sintered body is the "holding step." Maintaining the temperature of the sintered body does not necessarily have to keep the temperature constant. However, if a value obtained by dividing a temperature difference before and after the "holding step" by the time for performing the holding step is smaller than a predetermined cooling rate, it can be considered that the temperature of the sintered body is maintained.In this embodiment, the base body 3 can easily have the coating adhesion phase 9. The holding step can be carried out under the following conditions. Time: 0.5-2 hours Temperature: 800-1000 °C Pressure: 5-10 kPa Atmosphere: Hydrogen atmosphere

[0050] For example, the holding step is added when the sintered body is cooled by setting the cooling rate at 10°C / min. The conditions of the holding step at this time are as follows: a set temperature is 900°C, a temperature at the time of initiation is 930°C, a temperature at the time of completion is 870°C, and the time is set to one hour (60 minutes). A temperature change rate in the holding section is 1 [=(930-870) / 60] (°C / min), which is smaller than a cooling rate of 10°C / min. Therefore, it can be said that the holding section is added during cooling.

[0051] Subsequently, a coating layer 7 can be deposited on a surface 5 of the obtained base body 3 by a CVD process, whereby the coated tool 1 is obtained.

[0052] The TiCN layer 19 can be deposited as follows: First, a mixed gas formed from 0.1-10 vol.% titanium tetrachloride gas (TiCl 4 ), 10-60 vol.% nitrogen (N 2 ) gas, 0.1-15 vol.% methane-(CH 4 ) gas and the rest as hydrogen (H 2 ) gas as a reaction gas composition. Then, the mixed gas can be introduced into a chamber for depositing the TiCN layer 19, in which a temperature of 800-1100 °C and a pressure of 5-30 kPa are set.

[0053] The Al 2 O 3 -Layer 21 can be deposited as follows. First, a mixed gas formed from 0.5-5 vol.% aluminum trichloride (AlCl 3) gas, 0.5-3.5 vol.% hydrogen chloride (HCI) gas, 0.5-5 vol.% carbon dioxide (CO 2 ) gas, 0.5 vol% or less of hydrogen sulfide (H 2 S) gas and the rest hydrogen (H 2 ) gas as a reaction gas mixture. Then the mixed gas can be introduced into the chamber to produce the Al 2 O 3 -Layer 21, in which a temperature of 930-1010 °C and a pressure of 5-10 kPa are specified.

[0054] The TiN layer 23 can be deposited as follows: First, a mixed gas formed from 0.1-10 vol.% titanium tetrachloride (TiCl 4 ) gas, 10-60 vol.% nitrogen (N 2 ) gas and the rest hydrogen (H 2 ) gas as a reaction gas composition. Then, the mixed gas can be introduced into the chamber to deposit the TiN layer 23, in which a temperature of 800-1010 °C and a pressure of 10-85 kPa are set.

[0055] The above manufacturing method is one embodiment of the method for manufacturing the coated tool 1. Therefore, it is needless to say that the coated tool 1 is not limited to one manufactured by the above manufacturing method. <schneidwerkzeug>

[0056] A cutting tool 101 in a non-limiting embodiment of the present disclosure will be described below with reference to the drawings by illustrating the case of having the coated tool 1.

[0057] 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 one side of the first end 103a, and the coated tool 1 disposed in the pocket 105, as in a non-limiting embodiment shown in Fig. 5. When the cutting tool 101 includes the coated tool 1, stable machining can be performed due to the high wear resistance of the coated tool 1.

[0058] The pocket 105 may be a part that enables the attachment of the coated tool 1. The pocket 105 may open into an outer peripheral surface of the holder 103 and an end surface on one side of the first end 103a.

[0059] The coated tool 1 can be attached to the pocket 105 so that a cutting edge 29 can protrude from the holder 103. The coated tool 1 can also be attached to the pocket 105 by a fixing screw 107. That is, the coated tool 1 can be attached to the pocket 105 by inserting the fixing screw 107 into a through hole 31 of the coated tool 1 and by inserting a front end of the fixing screw 107 into a screw hole formed in the pocket 105 to ensure engagement between the screw parts. In this case, a lower surface of the coated tool 1 can directly contact the pocket 105, or alternatively, a plate can be held between the coated tool 1 and the pocket 105.

[0060] For example, steel and cast iron can be used as a material for the holder 103. When the material of the holder 103 is steel, the holder 103 has high toughness.

[0061] The cutting tool 101, which is used for a so-called turning operation, is in the Fig. 5 is exemplified. Examples of the turning process may include internal machining, external machining, and grooving. The use of the cutting tool 101 is not limited to the turning process. For example, it is not problematic if the cutting tool 101 is used for a milling process.

[0062] While the coated tool 1 and the cutting tool 101 have been exemplified above in the non-limiting embodiments of the present disclosure, the present disclosure is not limited to the above embodiments. It should be understood that it is possible to manufacture any of them without departing from the scope of the present disclosure.

[0063] For example, although the above non-limiting embodiment described the case of applying the coated tool 1 to the cutting tool 101, the coated tool 1 is also applicable to other uses. Examples of other uses may include wear-resistant parts such as sliding parts and metal molds, digging tools, tools such as cutting tools, and impact-resistant parts.

[0064] The coated tool 1 and the cutting tool 101 may have the following configurations. (1) The coated tool is one comprising a base body and a coating layer disposed on a surface of the base body. The base body has a coating adhesion phase containing at least one type of metal compound selected from carbide, nitride, and carbonitride, each of which contains Ti, W, and Co. The coating adhesion phase is disposed at a boundary between the base body and the coating layer. (2) The base body may be 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 adhesion phase may have a larger content of each of a β component and Co than the binder phase in the coated tool according to (1). (3) The coating adhesion phase may have a wave-like shape in a cross section perpendicular to the surface of the base body in the coated tool of the above (1) or (2). (4) The coating adhesion phase may have an average thickness of 0.05 to 0.5 µm in the coated tool of any of the above (1) to (3). (5) The coating adhesion phase may be formed in a cross section perpendicular to the surface of the base body in 20-70% of the boundary between the base body and the coating layer in the coated tool of any one of the above (1) to (4). (6) A composition of the base body may include Nb in the coated tool of any one of the above (1) to (5). (7) The base body may be cemented carbide containing 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 may further contain a β-phase, and the Nb may be contained in the β-phase or the binder phase or both in the coated tool of the above (6). (8) The coating layer may comprise a TiCN layer and an Al 2 O 3 -layer in the order from one side of the base body in the coated tool of any one of the above (1) to (7). (9) The coating layer may be a TiN layer, a TiCN layer and an Al 2 O 3 -layer in the order from one side of the base body in the coated tool of any one of the above (1) to (7). (10) A cutting tool may comprise a holder extending from a first end to a second end and having a pocket on a side of the first end, and the coated tool according to any one of the above (1) to (9) disposed in the pocket.

[0065] Although the present disclosure will be described in detail below by way of examples, the present disclosure is not limited to the following examples. EXAMPLES[Samples No. 1 and 2]<Herstellung beschichteter Werkzeuge>

[0066] First, WC powder with an average particle diameter of 3 µm, TiC powder with an average particle diameter of 1 µm, TaC powder with an average particle diameter of 1 µm, ZrC powder with an average particle diameter of 1 µm, Co powder with an average particle diameter of 1.5 µm, and NbC powder with an average particle diameter of 1 µm were prepared as raw material powders. These average particle diameters of the raw material powders were measured by the micro-track method.

[0067] Subsequently, a molded body was prepared by mixing these raw material powders so that the composition of a coating adhesion phase in a sintered body could be Composition A or Composition B in Table 1, followed by press-molding into the shape of a cutting tool (CNMG120408). The obtained molded body was subjected to debinding treatment and then sintered while being held at a temperature of 1450 to 1600 °C for 0.5 to 2 hours. Then, a cemented carbide-formed body was obtained by cooling after sintering. At this time, a cooling rate was set to the conditions shown in Table 2.

[0068] During cooling, a holding step was added. The holding step was performed under the following conditions. Time: 1 hour Temperature: 850 °C Pressure: 7.5 kPa Atmosphere: Hydrogen atmosphere

[0069] A coating layer was deposited on a surface of the obtained base body by the CVD method, thereby obtaining a coated tool shown in Table 2. As for the coating layer, a TiN layer with an average thickness of 1 µm, a TiCN layer with an average thickness of 10 µm, and an Al 2 O 3 -layer with an average thickness of 5 µm deposited from one side of the base body.

[0070] The composition of the bulk material was measured using EDS. Specifically, a cross-sectional observation was performed using the EDS contained in an SEM. Three random locations were measured at 5000–20000x magnification, and an average value was calculated.

[0071] The EDS measurement results showed that each of the obtained base bodies had a hard phase with W and C as a main component, a solid solution phase with W, C, and Ti as a main component, and a binder phase with an iron group metal (Co) as a main component. Each of the obtained base bodies also had a coating adhesion phase with the composition A or B in Table 1. The coating adhesion phase was located at a boundary between the base body and the coating layer. The coating adhesion phase had a larger content of each of the β-components (Ti) and Co than the binder phase.

[0072] The coating adhesion phase had a wavy shape in the cross-section perpendicular to the surface of the substrate. Specifically, in the above cross-section, a portion of the coating adhesion phase, located on the side opposite the boundary, was in contact with the hard phase. The portion in contact with the hard phase in the coating adhesion phase had the wavy shape.

[0073] The coating adhesion phase had an average thickness of 0.2 µm. The coating adhesion phase was formed at 60% of the boundary in the above cross-section.

[0074] The bulk body obtained with composition A contained Nb in its composition, and the bulk body contained the β-phase. The EDS measurement results of the β-phase composition showed that the β-phase was (W, Ti, Nb, Ta, Zr) C, and the Nb was contained in the β-phase and the binder phase. <Probe Nr. 3>

[0075] A base body was manufactured under the same conditions as Sample No. 1, except that a cooling rate was set to the conditions shown in Table 2 and no holding step was added during cooling. The same coating layer as in Sample No. 1 was deposited on a surface of the base body by the CVD method, thereby obtaining a coated tool shown in Table 2.

[0076] A composition of the bulk material was measured by EDS under the same conditions as Samples Nos. 1 and 2. The result showed that the obtained bulk material had a hard phase with W and C as a main component, a solid solution phase with W, C, and Ti as a main component, and a binder phase with an iron group metal (Co) as a main component, but no coating adhesion phase. <auswertungen>

[0077] The coated tools were subjected to a machining evaluation under the following conditions: Machining type: Turning Cutting speed: 150 m / min Feed: 0.4 mm / rev Cutting depth: 0.5 mm Workpiece: Round bar SCM435 ϕ200 (with four grooves) Processing condition: wet Other: The measurements were carried out with n=4 and an average value was calculated.

[0078] The evaluation results are shown in Table 2. The term "number of impacts until cutting edge breakage occurs" in the evaluation result of Table 2 indicates the number of impacts until the cutting edge breaks during one machining operation. This can also be referred to as intermittent performance evaluation. [Table 1] Composition of the coating adhesion phase A (mass %) B (mass %) WC 85,8 87 TiC 2,5 2 TaC 3 3 ZrC 1 1 Co 7 7 NbC 0,7 0 In total 100 100 [Table 2] Sample No. Sintering condition Presence or absence of the coating adhesion phase Composition of the coating adhesion phase Evaluation result Cooling rate (°C / min) Number of impacts until the cutting edge breaks (number) 1 14 Available A 7800 2 10 Available B 3100 3 3 Miss - 2000

[0079] Compared with Sample No. 3, Samples Nos. 1 and 2 had improved wear resistance of the cutting edge, and it was possible to perform stable machining as a cutting tool. DESCRIPTION OF REFERENCE SYMBOLS 1 coated tool 3 basic bodies 5 Surface 7 Coating layer (layer) 9 Coating adhesion phase 11 Hard phase 13 Solid solution phase 15 Binding phase 17 β-phase 19 TiCN layer 21 Al 2 O 3 -Layer 23 TiN layer 25 first surface (upper surface) 27 second surface (side surface) 29 Cutting edge 31 through hole 101 Cutting tools 103 holders 103a first end 103b second end 105 bag 107 Fixing screw S interface QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2022-116251

[0001] JP 2004-100004

[0003] JP 1-252306

[0004] < / auswertungen> < / schneidwerkzeug>

Claims

[1] A coated tool comprising: a basic body and a coating layer arranged on a surface of the base body, wherein the base body has a coating adhesion phase comprising at least one type of metal compound selected from carbide, nitride and carbonitride, each of which comprises Ti and W and Co, the coating adhesion phase is arranged at a boundary between the base body and the coating layer. [2] The coated tool according to claim 1, wherein the base body is hard metal, comprising a hard phase containing W and C, a solid solution phase comprising W, C and Ti, and a binder phase comprising an iron group metal, and the coating adhesion phase has a larger content of each of a β component and Co than the binder phase. [3] The coated tool according to claim 1 or 2, wherein the coating adhesion phase has a wavy shape in a cross section perpendicular to the surface of the base body. [4] The coated tool according to any one of claims 1 to 3, wherein the coating adhesion phase has an average thickness of 0.05 to 0.5 µm. [5] The coated tool according to any one of claims 1 to 4, wherein in the cross section perpendicular to the surface of the base body, the coating adhesion phase is formed at 20-70% of the boundary between the base body and the coating layer. [6] The coated tool according to any one of claims 1 to 5, wherein a composition of the base body comprises Nb. [7] The coated tool according to claim 6, wherein the base body is hard metal, which has a hard phase containing W and C, a solid solution phase comprising W, C and Ti, and a binder phase comprising a metal of the iron group, the parent body further comprises a β-phase and the Nb is contained in the β-phase or the binder phase or in both. [8] The coated tool according to any one of claims 1 to 7, wherein the coating layer comprises a TiCN layer and an Al 2 O 3 -layer in this order from one side of the base body. [9] The coated tool according to any one of claims 1 to 7, wherein the coating layer comprises a TiN layer, a TiCN layer and an Al 2 O 3 -layer in this order from one side of the base body. [10] A cutting tool comprising: a holder extending from a first end to a second end and having a pocket on one side of the first end, and the coated tool according to any one of claims 1 to 9, wherein the coated tool is arranged in the pocket.

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