SEPARATOR FOR FUEL CELL, FUEL CELL STACK, FUEL CELL ELECTRIC VEHICLE AND MANUFACTURING METHOD OF SEPARATOR FOR FUEL CELL

摘要

PPROBLEM TO BE SOLVED: To provide a separator for a fuel cell capable of keeping contact resistance between the separator and an electrode at a low value in an oxidizing environment, excelling in corrosion resistance and reduced in cost; and to provide its manufacturing method. PSOLUTION: This separator 3 for a fuel cell is formed into a structure including: a base layer 13 formed of stainless steel containing Fe as a main constituent, Cr and at least either Ni or Mo; a first nitrided layer 15 directly formed on the base layer 13, containing Fe as a main constituent and having an MSB4/SBN type crystalline structure where an N-atom is arranged in the octahedron void of a unit cell center in a face-centered cubic lattice which is formed with a transition metal atom selected from Fe, Cr, Ni and Mo; and a second nitrided layer 16 formed on the first nitrided layer 15, separated from the base layer 13 and selected from a single layer of CrN, a composite layer of CrN and an MSB4/SBN type crystalline structure, and a two-layer nitrided layer comprising an intermediate layer of CrN and an MSB4/SBN type crystalline structure and a CrN layer formed on the intermediate layer. PCOPYRIGHT: (C)2007,JPO&INPIT