# US 11,298,748 B2 · Surface coated cutting tool and method for manufacturing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,298,748 B2 - Document ID: US11298748B2 - Status: Granted - Kind: B2 - Application number: 16/958,183 - Filed: 2018-10-16 - Published: 2021-03-11 - Granted: 2022-04-12 - Earliest claimed: 2018-03-07 - Assignees: Sumitomo Electric Hardmetal Corp. - Applicants: Sumitomo Electric Hardmetal Corp. - Inventors: Haruyo Fukui; Makoto Setoyama; Keizo Tanaka; Kouhei Yoshimura - Web page: https://patentgrep.com/patent/US11298748B2 ## CPC - B23B 27/14: Cutting tools of which the bits or tips {or cutting inserts} are of special material - C23C 28/044: {coatings specially adapted for cutting tools or wear applications} - C23C 14/024: {Deposition of sublayers, e.g. to promote adhesion of the coating (C23C14/027 takes precedence)} - C23C 14/0641: {Nitrides (C23C14/0617 takes precedence)} - C23C 14/0664: {Carbonitrides} - C23C 14/16: on metallic substrates or on substrates of boron or silicon - C23C 14/325: {Electric arc evaporation} - C23C 28/42: {characterized by the composition of the alternating layers} - C23C 28/44: {characterized by a measurable physical property of the alternating layer or system, e.g. thickness, density, hardness} - C23C 30/005: {on hard metal substrates} - B23B 2224/24: Titanium aluminium nitride - B23B 2228/08: applied by physical vapour deposition [PVD] - B23B 2228/105: with specified thickness - B23C 5/16: characterised by physical features other than shape - B23B: TURNING; BORING (arrangements for copying or controlling B23Q) - C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04) - B23C: MILLING (broaching B23D; broach-milling in making gears B23F; arrangement for copying or controlling B23Q) ## Abstract A surface coated cutting tool comprises a base material and a coating layer that coats the base material, the coating layer including an alternate layer composed of a first unit layer and a second unit layer alternately stacked, the first unit layer being composed of a nitride containing aluminum and zirconium, in the first unit layer, when the total number of metal atoms constituting the first unit layer is represented as 1, a ratio thereto of the number of atoms of the zirconium being not less than 0.65 and not more than 0.95, the second unit layer being composed of a nitride containing titanium and aluminum, in the second unit layer, when the total number of metal atoms constituting the second unit layer is represented as 1, a ratio thereto of the number of atoms of the aluminum being larger than 0.40 and not more than 0.70. ## Claims ### Claim 1 A surface coated cutting tool comprising a base material and a coating layer that coats the base material, the coating layer including an alternate layer composed of a first unit layer and a second unit layer alternately stacked, the first unit layer being composed of a nitride containing aluminum and zirconium, in the first unit layer, when the total number of metal atoms constituting the first unit layer is represented as 1, a ratio thereto of the number of atoms of the zirconium being not less than 0.65 and not more than 0.95, the second unit layer being composed of a nitride containing titanium and aluminum, in the second unit layer, when the total number of metal atoms constituting the second unit layer is represented as 1, a ratio thereto of the number of atoms of the aluminum being larger than 0.40 and not more than 0.70. ### Claim 2 (depends on 1) The surface coated cutting tool according to claim 1, wherein when in the alternate layer the first unit layer and the second unit layer which are adjacent to each other have a thickness λ1 and a thickness λ2, respectively, a ratio λ2/λ1 is not less than 1 and not more than 5. ### Claim 3 (depends on 1) The surface coated cutting tool according to claim 1, wherein the first unit layer contains silicon, and in the first unit layer, when the total number of metal atoms constituting the first unit layer is represented as 1, a ratio thereto of the number of atoms of the silicon is larger than 0 and not more than 0.20. ### Claim 4 (depends on 1) The surface coated cutting tool according to claim 1, wherein the second unit layer contains silicon, and in the second unit layer, when the total number of metal atoms constituting the second unit layer is represented as 1, a ratio thereto of the number of atoms of the silicon is larger than 0 and not more than 0.20. ### Claim 5 (depends on 1) The surface coated cutting tool according to claim 1, wherein the first unit layer contains boron, and in the first unit layer, when the total number of metal atoms constituting the first unit layer is represented as 1, a ratio thereto of the number of atoms of the boron is larger than 0 and not more than 0.10. ### Claim 6 (depends on 1) The surface coated cutting tool according to claim 1, wherein the second unit layer contains boron, and in the second unit layer, when the total number of metal atoms constituting the second unit layer is represented as 1, a ratio thereto of the number of atoms of the boron is larger than 0 and not more than 0.10. ### Claim 7 (depends on 1) The surface coated cutting tool according to claim 1, wherein the first unit layer contains vanadium, and in the first unit layer, when the total number of metal atoms constituting the first unit layer is represented as 1, a ratio thereto of the number of atoms of the vanadium is larger than 0 and not more than 0.30. ### Claim 8 (depends on 1) The surface coated cutting tool according to claim 1, wherein the second unit layer contains vanadium, and in the second unit layer, when the total number of metal atoms constituting the second unit layer is represented as 1, a ratio thereto of the number of atoms of the vanadium is larger than 0 and not more than 0.30. ### Claim 9 (depends on 1) The surface coated cutting tool according to claim 1, wherein the first unit layer and the second unit layer each have a thickness of not less than 0.002 μm and not more than 0.2 μm. ### Claim 10 (depends on 1) The surface coated cutting tool according to claim 1, wherein the coating layer includes an underlying layer disposed between the base material and the alternate layer and the underlying layer has a composition identical to that of the first unit layer or the second unit layer. ### Claim 11 (depends on 1) The surface coated cutting tool according to claim 1, wherein the coating layer includes a front surface layer disposed on a side of a front surface of the alternate layer, the front surface layer is composed of a carbonitride containing titanium and aluminum, and in the front surface layer, when the total number of metal atoms constituting the front surface layer is represented as 1, a ratio thereto of the number of atoms of the aluminum is larger than 0.40 and not more than 0.60. ### Claim 12 (depends on 1) A method for manufacturing a surface coated cutting tool according to claim 1, comprising: preparing the base material; and alternately stacking the first unit layer and the second unit layer on the base material through physical vapor deposition to form the alternate layer on the base material to obtain the surface coated cutting tool. ### Claim 13 (depends on 1) The surface coated cutting tool according to claim 1, wherein the ratio λ2/λ1 is not less than 1 and is less than 3. ### Claim 14 (depends on 1) The surface coated cutting tool according to claim 1, wherein the coating layer has compressive residual stress of not more than 6 GPa in absolute value. ### Claim 15 (depends on 1) The surface coated cutting tool according to claim 1, wherein the coating layer has a cubic crystal structure.