Abstract
Five kinds of nuclear grade graphites were oxidized to study thermal oxidation effects on Young's modulus and electrical conductivity. The property changes were measured on specimens which were oxidized uniformly throughout their whole volume in the temperature range 500–600°C in air. The following relations were derived as a function of the bulk density of the graphites: E/ E 0 = ( ρ/ ρ0) n E and R 0/ R = ( ρ/ ρ0) n R , where E, R and ρ are Young's modulus, specific electrical resistivity and bulk density, respectively, and subscript zero refers to the initial unoxidized condition. The exponents n E and n R were found to be dependent on both the kind of graphite and the oxidation temperature, and the dependences were discussed in connection with selective oxidation in the graphite texture. It was also tried to relate the property changes with oxidation rate.
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