# US 4,692,385 A · Triplex article > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,692,385 A - Document ID: US4692385A - Status: Granted - Kind: A - Application number: 06/851,086 - Filed: 1986-04-14 - Granted: 1987-09-08 - Earliest claimed: 1986-04-14 - Assignees: Materials Development Corporation - Inventors: Philip C. Johnson - Web page: https://patentgrep.com/patent/US4692385A ## CPC - C23C 8/80: After-treatment - C23C 28/00: Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D - 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) ## Abstract A coated article and method for manufacturing the same wherein an alloy substrate of iron, nickel, cobalt, or titanium base has a diffusion layer formed thereon of an intermetallic boride of the substrate alloy. A coating is subsequently deposited on the diffusion layer, which coating is a refractory, ceramic or intermetallic compound having desired wear and/or corrosion resistant properties superior to those of the substrate. ## Claims ### Claim 1 A coated article comprising an alloy substrate of an alloy selected from the group consisting of iron, nickel, cobalt and titanium base alloys, a diffusion layer formed thereon comprising an intermetallic boride of the substrate alloy, a coating on said layer of a material selected from the group consisting of refractory, ceramic and intermetallic compounds having desired wear and/or corrosion resistent properties superior to those of said alloy substrate. ### Claim 2 (depends on 1) The article of claim 1 wherein said coating has a coefficient of thermal expansion that is closer to that of said diffusion layer than that of said substrate. ### Claim 3 (depends on 1) The article of claim 1 wherein said coating has a coefficient of thermal expansion within +/-30% of that of said diffusion layer. ### Claim 4 (depends on 1) The article of claim 1 wherein said coating has a coefficient of thermal expansion within +/-15% of that of said diffusion layer. ### Claim 5 (depends on 1) The article of claim 1 wherein said coating is a material selected from the group consisting of TiB.sub.2, Al.sub.2 O.sub.3, TiC, Cr.sub.3 C.sub.2, VC and TiN. ### Claim 6 (depends on 1) The article of claim 1 wherein said coating is TiB.sub.2. ### Claim 7 A coated article comprising an alloy substrate of an iron-base alloy, a diffusion layer formed thereon comprising an intermetallic boride of the substrate alloy, a coating on said layer of a material selected from the group consisting of refractory, ceramic and intermetallic compounds having desired wear and/or corrosion resistant properties superior to those of said alloy substrate. ### Claim 8 (depends on 7) The article of claim 7 wherein said coating has a coefficient of thermal expansion that is closer to that of said diffusion layer than that of said substrate. ### Claim 9 (depends on 7) The article of claim 7 where said coating has a coefficient of thermal expansion within +/-30% of that of said diffusion layer. ### Claim 10 (depends on 7) The article of claim 7 wherein said coating has a coefficient of thermal expansion within +/-15% of that of said diffusion layer. ### Claim 11 (depends on 7) The article of claim 7 wherein coating is a material selected from the group consisting of TiB.sub.2, Al.sub.2 O.sub.3, TiC, Cr.sub.3, C.sub.2, VC and TiN. ### Claim 12 (depends on 7) The coated article of claim 7 wherein said coating is TiB.sub.2. ### Claim 13 A coated article comprising an alloy substrate of a nickel-base alloy, a diffusion layer formed thereon comprising an intermetallic boride of the substrate alloy, a coating on said layer of a material selected from the group consisting of refractory, ceramic and intermetallic compounds having desired wear and/or corrosion resistant properties superior to those of said alloy substrate. ### Claim 14 (depends on 13) The article of claim 13 wherein said coating has a coefficient of thermal expansion that is closer to that of said diffusion layer than that of said substrate. ### Claim 15 (depends on 13) The article of claim 13 wherein said coating has a coefficient of thermal expansion within +/-30% of that of said diffusion layer. ### Claim 16 (depends on 13) The article of claim 13 wherein said coating has a coefficient of thermal expansion within +/-15% of that of said diffusion layer. ### Claim 17 (depends on 13) The article of claim 13 wherein said coating is a material selected from the group consisting of TiB.sub.2, Al.sub.2 O.sub.3, Tic, Cr.sub.3 C.sub.2, VC and TiN. ### Claim 18 (depends on 13) The article of claim 13 wherein said coating is TiB.sub.2. ### Claim 19 A coated article comprising an alloy substrate of a cobalt-base alloy, a diffusion layer formed thereon comprising an intermetallic boride of the substrate alloy; a coating on said layer of a material selected from the group consisting of refractory, ceramic and intermetallic compounds having desired wear and/or corrosion resistant properties superior to those of said alloy substrate. ### Claim 20 (depends on 19) The article of claim 19 wherein said coating has a coefficient of thermal expansion that is closer to that of said diffusion layer than that of said substrate. ### Claim 21 (depends on 19) The article of claim 19 wherein said coating has a coefficient of thermal expansion within +/-30% of that of said diffusion layer. ### Claim 22 (depends on 19) The article of claim 19 wherein said coating has a coefficient of thermal expansion within +/-15% of that of said diffusion layer. ### Claim 23 (depends on 19) The article of claims 19 wherein said coating is a material selected from the group consisting of TiB.sub.2, Al.sub.2 O.sub.3, TiC, Cr.sub.3 C.sub.2, VC and TiN. ### Claim 24 (depends on 19) The article of claim 19 wherein said coating is TiB.sub.2. ### Claim 25 A coated article comprising a titanimum base alloy substrate, a diffusion layer formed thereon comprising an intermetallic titanium boride compound, a coating on said layer of a material selected from the group consisting of refractory, ceramic and intermetallic compounds having desired errosion and abrasion-resistant properties superior to those of said substrate. ### Claim 26 (depends on 25) The article of claim 25 wherein said coating is TiB.sub.2. ### Claim 27 (depends on 25) The article of claim 25 wherein said coating is thicker than said diffusion layer.