ENHANCEMENT OF RESISTANCE AGAINST OXIDATION WITH CARBON-DIOXIDE FOR FORMED-COKE AND ELECTRODE-GRADE GRAPHITE AND CARBON BY INFILTRATING CARBON INTO PORES

Formed coke, electrode-grade graphite (E.G.) and electrode-grade carbo n (E.C.) were modified by infiltrating carbon within the pores by use of methane cracking. The rate of oxidation with CO2 was lowered for al l these samples but the amount of reduction was dependent on pore stru ctures. Decrease in the rate for the electrode-grade carbon was very l arge compared to other samples. The mechanism of enhancement of resist ance against oxidation was explained in terms of the pore structure ch anges accompanying infiltration and oxidation.