HEAT-RESISTANT ALLOY MEMBER, CURRENT COLLECTING MEMBER FOR FUEL CELL, FUEL CELL CELL STACK, AND FUEL CELL

• Main Authors: AZUMA MASAHIKO, FUKAMIZU NORIMITSU
• Format: Patent
• Language: English
• Published: 13.03.2008
• Subjects: ALLOYS; APPARATUS THEREFOR; BASIC ELECTRIC ELEMENTS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; ELECTRICITY; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; FERROUS OR NON-FERROUS ALLOYS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide a heat-resistant alloy member capable of preventing the diffusion of Cr from the corner part and to provide a current collecting member of a fuel cell, a fuel cell stack, and the fuel cell. SOLUTION: The surface of a current collecting substrate 201 containing Cr is covered with a dense Cr-diffusion preventing layer 202 made of an oxide, the surface of the Cr diffusion preventing layer 202 is covered with a conductive covering layer 203 made of an oxide, and the thickness of the covering layer 203 in the plane part is made thicker than that at the corner part. The Cr diffusion preventing layer 202 is formed on the surface of the current collecting substrate 201 by heat-treating a metal layer formed by a plating method or an electrostatic coating method, and the covering layer 203 is formed on the surface of the Cr diffusion preventing layer 202. COPYRIGHT: (C)2008,JPO&INPIT