TITANIUM SHEET MATERIAL FOR FUEL CELL SEPARATORS AND METHOD FOR PRODUCING SAME

摘要

Provided is a titanium sheet for fuel cell separators which can surely achieve a low contact resistance. This titanium sheet for fuel cell separators includes a titanium base metal and a surface layer. The titanium base metal has a recrystallized structure. The surface layer includes a compound-mixed titanium layer having thickness less than 1 μm alone. The compound-mixed titanium layer includes a mixture of matrix titanium (Ti) and a compound between Ti and at least one element selected from the group consisting of oxygen (O), carbon (C), and nitrogen (N). The matrix titanium contains O, C, and N each solid-soluted in the titanium. Alternatively, the surface layer includes the compound-mixed titanium layer and a passivation layer being disposed on a surface of the compound-mixed titanium layer and having a thickness less than 5 nm.

主权项

1. A titanium sheet for fuel cell separators, the titanium sheet comprising:
a titanium base metal, and a surface layer wherein: the titanium base metal comprises a recrystallized structure, the surface layer comprises:
a compound-mixed titanium layer having a thickness of less than 1 μm, andoptionally a passivation layer having a thickness of less than 5 nm and being disposed on a surface of the compound-mixed titanium layer; the compound-mixed titanium layer comprises a mixture of:
a matrix titanium (Ti) comprising oxygen (O), carbon (C), and nitrogen (N) that is each solid-soluted in the matrix; anda compound comprising Ti and at least one element selected from the group consisting of O, C, and N.