The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 22, 2014
Filed:
Jun. 15, 2007
Michio Kaneko, Tokyo, JP;
Kazuhiro Takahashi, Tokyo, JP;
Kiyonori Tokuno, Tokyo, JP;
Hiroshi Kihira, Tokyo, JP;
Wataru Hisada, Kitanagoya, JP;
Michio Kaneko, Tokyo, JP;
Kazuhiro Takahashi, Tokyo, JP;
Kiyonori Tokuno, Tokyo, JP;
Hiroshi Kihira, Tokyo, JP;
Wataru Hisada, Kitanagoya, JP;
Nippon Steel Sumitomo Metal Corporation, Tokyo, JP;
Abstract
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.