# US 9,751,809 B2 · Hard coating having excellent adhesion resistance to soft metal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,751,809 B2 - Document ID: US9751809B2 - Status: Granted - Kind: B2 - Application number: 14/443,243 - Filed: 2013-12-17 - Published: 2015-11-26 - Granted: 2017-09-05 - Earliest claimed: 2012-12-21 - Assignees: Kobe Steel, Ltd. - Applicants: Kobe Steel, Ltd. - Inventors: Kenji Yamamoto - Web page: https://patentgrep.com/patent/US9751809B2 ## CPC - C04B 35/581: based on aluminium nitride - B21D 37/01: Selection of materials - C04B 35/58007: {based on refractory metal nitrides} - C04B 35/58014: {based on titanium nitrides, e.g. TiAlON} - C23C 14/0641: {Nitrides (C23C14/0617 takes precedence)} - B21D 22/022: {by heating the blank or stamping associated with heat treatment (C21D takes precedence)} - Y10T 428/24355: Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.] - C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE - B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F) - 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) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Provided is a hard coating film which is hardly adhered to a soft metal and is suitable for the coating of, for example, the surface of a hot pressing mold that may be in contact with the soft metal. The hard coating film is characterized in that, on the surface of the hard coating film, the arithmetic average roughness (Ra) is 0.05 μm or less and the average number of pin holes each having an equivalent circle diameter of 1 μm or more is 5 or less per field when at least five fields each having a size of 45×65 μm are observed on a scanning electron microscope at 2000-fold magnification. ## Claims ### Claim 1 A hard coating having excellent adhesion resistance to a soft metal, comprising: metallic elements containing at least two elements selected from the group consisting of Ti, Cr, Al, and Si, and at least one nonmetallic elements selected from the group consisting of C, N, and O, wherein the metallic elements contain Ti, Cr, and Al, and atomic ratios of the metallic elements based on all the metallic elements satisfy Ti: 0.10 or more and 0.40 or less, Cr: 0.10 or more and 0.40 or less, and Al: 0.40 or more and 0.70 or less, the metallic elements are partially replaced by at least one element selected from the group consisting of Group IV elements, Group V elements, and Y of the periodic table in a proportion of 20 at. % or less in terms of a ratio based on all the metallic elements, and an arithmetic average roughness (Ra) of a surface is 0.05 μm or less and an average number of pin holes having a circle equivalent diameter of 1 μm or more is 5 or less when the surface is observed using a scanning electron microscope for at least five fields each having a size of 45×65 μm at 2000-fold magnification. ### Claim 2 (depends on 1) The hard coating according to claim 1, which is formed by a filtered arc ion plating method or an unbalanced magnetron sputtering method. ### Claim 3 (depends on 1) A hard-coating coated member, comprising: the hard coating according to claim 1 coating a surface of the member. ### Claim 4 (depends on 1) A hot pressing die, comprising: the hard coating according to claim 1 coating a surface of the die. ### Claim 5 (depends on 4) The hot pressing die according to claim 4, which is used for hot forming of a material to be processed at least a surface of which contains one or more soft metals selected from the group consisting of Zn, Sn, Al, and Mg. ### Claim 6 (depends on 4) The hot pressing die according to claim 4, which is used for hot forming of a galvanized steel plate. ### Claim 7 A hard coating having excellent adhesion resistance to a soft metal, comprising: metallic elements containing at least two elements selected from the group consisting of Ti, Cr, Al, and Si, and at least one nonmetallic elements selected from the group consisting of C, N, and O, wherein the metallic elements contain Ti, Cr, Al, and Si and atomic ratios of the metallic elements based on all the metallic elements satisfy Ti: 0.10 or more and 0.40 or less, Cr: 0.10 or more and 0.40 or less, Al: 0.40 or more and 0.70 or less, and Si: 0.010 or more and 0.10 or less, the metallic elements are partially replaced by at least one element selected from the group consisting of Group IV elements, Group V elements, and Y of the periodic table in a proportion of 20 at. % or less in terms of a ratio based on all the metallic elements, and an arithmetic average roughness (Ra) of a surface is 0.05 μm or less and an average number of pin holes having a circle equivalent diameter of 1 μm or more is 5 or less when the surface is observed using a scanning electron microscope for at least five fields each having a size of 45×65 μm at 2000-fold magnification.