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Patent Searching and Data


Title:
PURE TITANIUM OR TITANIUM ALLOY SEPARATOR FOR SOLID POLYMER FUEL CELL AND METHOD FOR PRODUCING THE SAME
Document Type and Number:
WIPO Patent Application WO/2007/145377
Kind Code:
A1
Abstract:
Disclosed is a separator made of pure titanium or a titanium alloy which is used for solid polymer fuel cells and excellent in contact resistance with a carbon paper. Also disclosed is a method for producing such a separator for solid polymer fuel cells. Specifically disclosed is a separator having a surface portion wherein conductive compound particles are firmly fixed, which is characterized in that a surface oxide has a thickness of 3-15 nm, the average carbon concentration in the region from the outermost surface to 100 nm deep including the oxide layer is 0.02-6 at%, and the conductive compound particles have an average particle diameter of 0.01-20 μm. Also specifically disclosed is a method for producing a separator, which is characterized by a process wherein the surface of a molded article after molding is subjected to blasting, wherein particles obtained by coating the surface of a superhard core particle with conductive compound particles having an average particle diameter of 0.01-20 μm are projected onto the surface, then the molded article is coated with or immersed in an aqueous nitric acid solution having a concentration of 15-71% by mass and a temperature of 40-100˚C for a time period not less than 30 seconds but not more than 180 minutes, and then subjected to cleaning.

Inventors:
KANEKO MICHIO (JP)
TAKAHASHI KAZUHIRO (JP)
TOKUNO KIYONORI (JP)
KIHIRA HIROSHI (JP)
HISADA WATARU (JP)
Application Number:
PCT/JP2007/062546
Publication Date:
December 21, 2007
Filing Date:
June 15, 2007
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
KANEKO MICHIO (JP)
TAKAHASHI KAZUHIRO (JP)
TOKUNO KIYONORI (JP)
KIHIRA HIROSHI (JP)
HISADA WATARU (JP)
International Classes:
H01M8/02; C22C14/00; C23C22/13; C23C24/02; C23C28/04; H01M8/10
Foreign References:
JP2006140095A2006-06-01
JP2001357862A2001-12-26
JP2002358974A2002-12-13
JP2007005112A2007-01-11
JP2000260439A2000-09-22
JP2000256808A2000-09-19
JP2001006713A2001-01-12
JP2001357862A2001-12-26
Other References:
See also references of EP 2031687A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (Toranomon 37 Mori Bldg.5-1, Toranomon 3-chome,Minato-k, Tokyo 23, JP)
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