TRANSITION METAL NITRIDE, SEPARATOR FOR FUEL CELLS, FUEL CELL STACK, FUEL CELL VEHICLE, METHOD OF MANUFACTURING TRANSITION METAL NITRIDE, AND METHOD OF MANUFACTURING SEPARATOR FORFUEL CELLS

摘要

A transition metal nitride is obtained by a nitriding treatmentof a surface of a base material including a transition metal or an alloyof the transition metal, and the transition metal nitride has a crystalstructure of an M4N type and a crystal structure of an .epsilon.-M2-3N type,and is formed over a whole area of the surface of the base material andcontinuously in a depth direction from the surface.