METHOD OF PRODUCING POROUS ISOTROPIC GRAPHITE MATERIALS Russian patent published in 1994 - IPC

FIELD: carbon-graphite materials production. SUBSTANCE: disperse powder of oxidized graphite having fraction less 0.25 mm is mixed with pitch ( its quantity being 5-40 mass % ) and placed into gas-proof press-mould. Then heat treatment at 500-1000 C is carried out, heating rate being 10-50 C/s, sustaining at final temperature being 1-10 min. Oxidized carbon fibers having length less 10 mm may be added into mixture of graphite and pitch ( fiber's quantity is 1-10 mass % ). Articles has: specific conductivity 10-12 Om^-1cm^-1 , density 140 kg/m³, porosity 93 % , temperature coefficient of conductivity at 1000-2500 C is 5-10% . EFFECT: decreases conductivity and temperature coefficient of conductivity. 3 cl, 1 tbl