Titanium alloy material for polymer electrolyte fuel cell separator having low contact resistance, manufacturing method thereof, and polymer electrolyte fuel cell separator using the titanium alloy material

摘要

PPROBLEM TO BE SOLVED: To provide a titanium alloy material for a solid high polymer type fuel cell separator having low contact resistance, to provide its production method, and to provide a solid high polymer type fuel cell separator using the titanium alloy material. PSOLUTION: The titanium alloy material is composed of a titanium alloy having a composition comprising, by mass, 0.5 to 15% Ta, and in which the contents of Fe and O are limited according to necessary. The average nitrogen concentration in the range from the outermost surface to a depth of 0.5 m is 6 atomic%, and also, tantalum nitride and titanium nitride are present in the region. Its production method is characterized in that heating is performed in the temperature range of 600 to 1,000C for 3 s in a nitrogen atmosphere. Further, the solid polymer type fuel cell separator is characterized in that the above titanium alloy material is used. PCOPYRIGHT: (C)2007,JPO&INPIT