Metal separator for fuel cell and its production method
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsTeruyuki OHTANI, Makoto Tsuji, Masao Utsunomiya
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Abstract
The present invention provides a metallic separator for fuel cells capable of suppressing dropping out of conductive inclusions due to gaps formed at the interface of a base material and the conductive inclusions due to press-forming, thereby decreasing the contact resistance and enhancing the power generation performance, and also provides a method for producing the same.
Claims6
A metallic separator for fuel cells, comprising conductive inclusions projecting from a surface of a base material, the surface being treated by a chemical substance forming process for promoting volume expansion of the base material, and the conductive inclusions satisfying the relation 0.16≦R/r≦0.8, where R is a diameter equivalent to the average circle size of the conductive inclusions, and r is diameter equivalent to the average circle size of crystal grains of the base material.
A producing method for metallic separator for fuel cell for press-forming a separator material plate having conductive inclusions projecting from a surface, wherein the surface of the separator material plate is treated by a chemical substance forming process for promoting volume expansion of a base material.
Dependencies are inferred from the claim text.