209 原子炉用黒鉛の大気中酸化に及ぼす外部(剪断)応力の効果と酸化された黒鉛の機械的性質(OS9-(1) 超塑性と材料および造形法,オーガナイズドセッション)

概要

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High temperature gas cooled reactors (HTGRs) are designed to produce high temperature gas, and their research and development is carried out in the world wide. Nuclear graphites to be used for the reactors will be subjected to oxidation damage at high temperature over a long period of operation time. In this study, oxidation experiments were carried out under different shear stresses as well as under no applied stress. Moreover, tensile and compression tests were carried out to these oxidized specimens at room temperature. As a result, fine-grained isotropic graphites (IG-11 and IG-110) were weakened by the oxidation. The shear stress at the oxidation treatment gave the much decrease of the tensile strength of IG-110 after oxidation. Test results are discussed with shear stress effects in some detail.
2009-08-25