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AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsMichio Kaneko, Kazuhiro Takahashi, Kiyonori Tokuno, Hiroshi Kihira, Wataru Hisada
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The present invention provides a polymer electrolyte fuel cell separator made of pure titanium or a titanium alloy superior in contact resistance with carbon paper and a method of production of the same, that is, a separator having a surface layer part to which conductive compound particles are affixed, characterized in that the surface oxide has a thickness of 3 to 15 nm in range, an average carbon concentration in a range from an outermost surface, including the oxide layer, to a depth of 100 nm is 0.02 to 6 at %, and the conductive compound particles have an average particle size of 0.01 to 20 μm. Further, the method of production of the present invention is characterized by forming, blast treating a surface of the formed article by particles comprised of conductive compound particles of an average particle size of 0.01 to 20 μm covering a surface of superhard core particles, impregnating it by a nitric acid aqueous solution of a concentration of 15 to 71 mass % and a temperature of 40 to 100° C. for 30 seconds to 180 minutes by spraying or dipping, then washing it.
A polymer electrolyte fuel cell separator made of pure titanium or a titanium alloy having a surface layer part to which conductive compound particles are affixed, said polymer electrolyte fuel cell separator made of pure titanium or a titanium alloy characterized in that the pure titanium or titanium alloy has a surface oxide of a thickness of 3 to 15 nm in range, an average carbon concentration in a range from an outermost surface, including the oxide layer of the pure titanium or titanium alloy, to a depth of 100 nm is 0.4 to 6 at %, and said conductive compound particles have an average particle size of 0.01 to 20 μm and a density per unit area at a separator surface part of 1×108/cm2 or more, wherein said conductive compound particles comprise one or more of Cr2N, CrSi2, VB, V8C7, VN, TaN, TaC, and WN.
Dependencies are inferred from the claim text.