Nippon Pillar Packing Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Kazuhiko Otawa

Katsunori Sugita

Tsunemori Yoshida

Toshiyuki Fukumoto

Shoji Kato

Yasuaki Kawakami

According to the invention, in a separator molded member (A) for a fuel cell which is produced by: loading a complex compound that is configured by bonding graphite powder by means of a thermosetting resin, into a mold (); and forming ribs () for forming gas passages by the resin molding process, the surfaces of the ribs () are alkali-treated by, for example, etching by using an alkaline solution, and graphite particles () which are flat and soft are exposed from the top surfaces of the ribs () which function as a contact surface with an electrode in the separator molded member (A), and resin defective portions () are formed between adjacent graphite particles (), whereby the contact area with an electrode is enlarged, so that the performance and efficiency of the fuel cell can be improved by remarkable lowering of the contact resistance.

Fuel cell separator

According to the invention, in a separator () for a fuel cell which is produced by: loading a complex compound that is configured by bonding graphite powder by means of a thermosetting resin, into a mold (); and forming ribs () for forming gas passages by the resin molding process, the surfaces of the ribs () are etched by an alkaline solution or alkali-treated, a surface resin layer which is formed on the surface of the separator () is removed away, and graphite particles showing a plate-like form are exposed from the surfaces of the ribs () which function as a contact surface with an electrode, whereby the contact resistance with an electrode is remarkably lowered, so that the performance and efficiency of the fuel cell can be improved.

Fuel cell separator and production method therefor

To provide a separator for a fuel cell made of graphite excellent in mechanical strength and gas impermeability as well as electric characteristic properties, a separator for a fuel cell is produced from a molded body produced by filling a graphite powderwhose surface is coated with resinin a molding die and by pressure-molding the powder. Such a molded body is provided with excellent mechanical strength of 40 MPa of bending strength or higher, 10&#xd7;10cc&#xb7;cm/cm&#xb7;sec&#xb7;atm of gas permeability or lower, and electric property of 10&#xd7;10&#x3a9;&#xb7;cm of the volume resistance or lower even if the content of resin is decreased to as low as 10 to 24 wt. %.

Separator for a fuel cell and manufacturing method of the separator

A polishing pad that can polish the surface of work pieces, such as semiconductor silicon wafers, with satisfactory results. Polishing pad 1.sub.1 is formed of a large number of resin polishing elements 11, all tubular with a very small diameter, inseparably bound together, outer peripheral surface to outer peripheral surface, with the axial direction tube end faces aligned on a plane, to form a plate structure 10 with two kinds of pores 12, 13, which are regularly positioned and run through the plate structure 10 in the thickness direction. Pad surface 1a of polishing pad 1.sub.1 is formed by the axial direction tube end faces of polishing elements 11 . . . . First pore 12 is the center pore in the polishing element 11. Second pore 13 is formed between the outer peripheral surfaces of the polishing elements 11 . . . .

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Osaka, Japan

Kazuhiko Otawa