Separator for fuel cell and production process for the same
AssigneeMitsubishi Pencil Company, Limited
InventorsNoboru Kanba, Yoshihisa Suda
Life of this patent
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Abstract
In order to provide a separator for a fuel cell which is improved in cell characteristics by controlling a wetting property of the separator for a fuel cell and a production process for the same, assumed is a constitution in which in a separator A for a fuel cell molded from at least from a carbon material, a hydrophilic functional group is formed and increased on a surface part of a flow passage surface 11 in the separator 10 by irradiation treatment of a YAG laser apparatus 20 and in which an uneven part having an average surface roughness Ra of less than 50 μm is formed.
Claims13
A production process of a separator for a fuel cell comprising:
- forming and increasing a hydrophilic functional group on a part or the whole part of a flow passage surface of the separator for a fuel cell molded from at least a carbon material and,
- forming an uneven part having an average surface roughness Ra of more than 0.2 μm and less than 50 μm on a part or the whole part of the flow passage surface,
- by subjecting said part of the flow passage surface of the separator to laser irradiation treatment at an output power of 3 to 15 W in gas atmosphere containing at least oxygen.
A separator for a fuel cell comprising any one of carbon materials selected from the group consisting of at least an expanded graphite, a vitreous carbon and a composite material of vitreous carbon and graphite, wherein a hydrophilic functional group is formed and increased, and an uneven part having an average surface roughness Ra of more than 0.2 μm and less than 50 μm is formed on a part or the whole part of a flow passage surface of the separator by laser irradiation treatment at an output power of 3 to 15 W in gas atmosphere containing at least oxygen.
Dependencies are inferred from the claim text.