CARBON FIBER WOVEN FABRIC AND METHOD FOR PRODUCTION THEREOF

摘要

A carbon fiber woven fabric which is prepared by baking a cellulosic fabric in a non-oxidizing atmosphere, optionally after impregnating it with a solution of phosphoric acid or a derivative thereof and has a thickness of 0.05 to 0. 4 mm, an edgewise volume resistivity less than 0.2 $(g)Vcm and a gas permeability of 1500 cc/cm2/hr/mmAq or more, and is useful as a carbon sheet employed for gas diffusion in a fuel cell. A carbon fiber woven fabric which also exhibits water repellency and thus is suitable for a porous carbon shee t is prepared by blending a resin powder with the above carbon fiber woven fabric, which is prepared by baking a cellulosic fabric in a non-oxidizing atmosphere after or without impregnating with a solution of phosphoric acid or a derivative thereof, and heating the resultant mixture.