# US 2018/0323447 A1 · Titanium product, separator and polymer electrolyte fuel cell > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0323447 A1 - Document ID: US20180323447A1 - Status: Published application - Kind: A1 - Application number: 15/772,627 - Filed: 2016-11-08 - Published: 2018-11-08 - Earliest claimed: 2015-11-10 - Assignees: Nippon Steel & Sumitomo Metal Corporation - Applicants: Nippon Steel & Sumitomo Metal Corporation - Inventors: Junko IMAMURA; Jun MAKI; Koichi NOSE; Hideya KAMINAKA - Web page: https://patentgrep.com/patent/US20180323447A1 ## CPC - H01M 8/0245: in the form of layered or coated products - B32B 9/00: Layered products comprising a {layer of a} particular substance not covered by groups B32B11/00 - B32B29/00 - B32B 15/04: comprising metal as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a bituminous or tarry layer B32B11/08; next to a water-setting substance layer B32B13/06; next to a glass layer B32B17/061; next to a cellulosic plastic layer B32B23/042)} - C22C 14/00: Alloys based on titanium - C22F 1/18: High-melting or refractory metals or alloys based thereon - C23C 28/04: only coatings of inorganic non-metallic material - C23C 28/042: {including a refractory ceramic layer, e.g. refractory metal oxides, ZrO2, rare earth oxides} - C23C 28/046: {with at least one amorphous inorganic material layer, e.g. DLC, a-C:H, a-C:Me, the layer being doped or not} - C23C 28/322: {only coatings of metal elements only} - C23C 28/345: {with at least one oxide layer} - H01M 8/0206: Metals or alloys - H01M 8/0232: Metals or alloys - H01M 8/0234: Carbonaceous material - C22F 1/183: {of titanium or alloys based thereon} - H01M 2008/1095: {Fuel cells with polymeric electrolytes} - Y02E 60/50: Fuel cells - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - C22C: ALLOYS (treatment of alloys C21D, C22F) - C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00) - 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) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract This titanium product includes a base metal, and a complex oxide film formed on the surface of the base metal. The base metal has a chemical composition consisting of, by mass %, platinum group elements: 0 to 0.15%, rare earth elements: 0 to 0.1%, and a balance: Ti and impurities. The complex oxide film contains a complex oxide of Ti and one or more elements selected from La, Ce, Nd, Sr and Ca, and has a thickness of 1 to 20 nm. The average grain size at the base metal surface is preferably from 20 to 300 μm. ## Claims ### Claim 1 A titanium product, comprising: a base metal having a chemical composition consisting of, by mass %, platinum group elements: 0 to 0.15%, rare earth elements: 0 to 0.1%, and a balance: Ti and impurities; and a complex oxide film formed on a surface of the base metal, the film containing a complex oxide of Ti and one or more elements selected from La, Ce, Nd, Sr and Ca, and having a thickness of 1 to 20 nm. ### Claim 2 (depends on 1) The titanium product according to claim 1, wherein the chemical composition of the base metal contains, by mass %, the platinum group elements: 0.005 to 0.15%. ### Claim 3 (depends on 1) The titanium product according to claim 1, wherein the chemical composition of the base metal contains, by mass %, the rare earth elements: 0.005 to 0.1%. ### Claim 4 (depends on 1) The titanium product according to claim 1, wherein an average grain size at the surface of the base metal is 20 to 300 μm. ### Claim 5 (depends on 1) The titanium product according to claim 1, wherein the titanium product has, at an outermost layer, a metal layer containing one or more elements selected from Au, Pt, Ag, Pd, Ru and Rh as a main constituent and having a thickness of 2 to 50 nm. ### Claim 6 (depends on 1) The titanium product according to claim 1, wherein the titanium product has, at an outermost layer, a conductive carbon layer containing conductive carbon as a main constituent and having a thickness of 2 to 50 nm. ### Claim 7 (depends on 1) A separator for a polymer electrolyte fuel cell, which comprises the titanium product according to claim 1. ### Claim 8 (depends on 7) A polymer electrolyte fuel cell, which comprises the separator according to claim 7. ### Claim 9 (depends on 4) The titanium product according to claim 4, wherein the titanium product has, at an outermost layer, a metal layer containing one or more elements selected from Au, Pt, Ag, Pd, Ru and Rh as a main constituent and having a thickness of 2 to 50 nm. ### Claim 10 (depends on 4) The titanium product according to claim 4, wherein the titanium product has, at an outermost layer, a conductive carbon layer containing conductive carbon as a main constituent and having a thickness of 2 to 50 nm. ### Claim 11 (depends on 4) A separator for a polymer electrolyte fuel cell, which comprises the titanium product according to claim 4. ### Claim 12 (depends on 5) A separator for a polymer electrolyte fuel cell, which comprises the titanium product according to claim 5. ### Claim 13 (depends on 6) A separator for a polymer electrolyte fuel cell, which comprises the titanium product according to claim 6. ### Claim 14 (depends on 9) A separator for a polymer electrolyte fuel cell, which comprises the titanium product according to claim 9. ### Claim 15 (depends on 10) A separator for a polymer electrolyte fuel cell, which comprises the titanium product according to claim 10. ### Claim 16 (depends on 11) A polymer electrolyte fuel cell, which comprises the separator according to claim 11. ### Claim 17 (depends on 12) A polymer electrolyte fuel cell, which comprises the separator according to claim 12. ### Claim 18 (depends on 13) A polymer electrolyte fuel cell, which comprises the separator according to claim 13. ### Claim 19 (depends on 14) A polymer electrolyte fuel cell, which comprises the separator according to claim 14. ### Claim 20 (depends on 15) A polymer electrolyte fuel cell, which comprises the separator according to claim 15.