核融合炉用炭素系材料の超微小負荷硬さ及びマイクロビッカース硬さの評価

抄録

Carbon fiber reinforced carbon composite (C/C composite) and tungsten materials are expected as divertor materials that receive the highest heat flux load in large-scale fusion experimental device. Graphite materials for fusion reactors, such as C/C composite, have extremely high heat resistance (sublimation point of 3,650K) and high thermal shock resistance, and can withstand high heat flux loads such as plasma disruption. Ultra-low loaded hardness and micro Vickers hardness tests were carried out on isotropic graphite (IG-430U), C/C composite (CX-2002U) and pyrolytic graphite (PyG) for fusion reactors. The microstructures were also observed by SEM. As the results, IG-430U had isotropic property. CX2002U had data variation due to fibers and pores. PyG had anisotropic property due to extreme layered structure. It was necessary to be performed by ultra-micro load of 200 mN in the ultra-low loaded hardness test. And the micro Vickers hardness test was not suitable for the graphite materials.