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)
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:
Assignee:
NIPPON STEEL CORP (JP)
KANEKO MICHIO (JP)
TAKAHASHI KAZUHIRO (JP)
TOKUNO KIYONORI (JP)
KIHIRA HIROSHI (JP)
HISADA WATARU (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:
JP2006140095A | 2006-06-01 | |||
JP2001357862A | 2001-12-26 | |||
JP2002358974A | 2002-12-13 | |||
JP2007005112A | 2007-01-11 | |||
JP2000260439A | 2000-09-22 | |||
JP2000256808A | 2000-09-19 | |||
JP2001006713A | 2001-01-12 | |||
JP2001357862A | 2001-12-26 |
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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