PURPOSE: To improve homogeneity, gas permeability, thermal conductivity, electric conductivity, and mechanical strength and to control the pore diameter and distribution of pores as regards an electrode substrate for a fuel cell.
CONSTITUTION: A slurry containing 100 pts.wt. of carbon fiber and/or fiber which can be changed into carbon fiber, 20-200 pts.wt. of binder having 40-75wt.% carbonization yield, 10-500 pts.wt. of org. granular material having ≤30wt.% carbonzation yield, and 10-250 pts.wt. of mesophase pitch having ≥70wt.% carbonization yield is molded by sucking to form a carbonaceous preformed body having a paper structure. As for the org. granular material, a hardened material of thermosetting resin which does not soften by heat, or a hardened material of thermosetting resin containing pitch is used. The preformed body having a paper structure is homogeneous without precipitation of the org. granular material. The preformed body is molded with heat and pressure, and then carbonized or graphitized to obtain an electrode substrate.
DOI SHOJI
HAMAOKA SATORU
NAKAGAWA YOSHITERU
OKAMOTO KAZUO
Next Patent: JPS6135771