Titanium Material, Separator, Cell, and Polymer Electrolyte Fuel Cell Stack

Abstract

A titanium material including a base metal made of pure titanium or a titanium alloy and a titanium oxide film formed on the base metal. Peak intensities obtained by thin-film X-ray diffraction analysis performed on an outer layer of the titanium material using an incident angle of 0.3° satisfy (I(104)+I(200))/I(101)≥0.08−0.004×I(200), where I(104) is the peak intensity resulting from a plane (104) of a Ti2O3 phase, I(200) is the peak intensity resulting from a plane (200) of a TiO phase, I(101) is the peak intensity resulting from a plane (101) of an α-Ti phase, and 0<I(104), 0≤I(200), and 0<I(101). The titanium material is inexpensive and has both the electrical conductivity and corrosion resistance.

Dependencies are inferred from the claim text.