Abstract
Changes in thermal conductivity, coefficient of thermal expansion (CTE). electrical resistivity, and Young's modulus were measured for the two nuclear grade graphites IG-11 and H451 oxidized thermally in air at 723 K and by water vapor at 1123 K. Thermal conductivity, CTE and Young's modulus decreased and electrical resistivity increased owing to the oxidation. The changes were dependent on the graphites as well as the oxidation condition. The results were analyzed and discussed. Furthermore the changes in thermal shock resistance were discussed for the thermally oxidized nuclear grade graphites.
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