Abstract
Plasma facing materials for fusion experimental devices are required to have high thermal resistance, high thermal conductivity, thermal shock resistance, radiation damage resistance and so on. There are no materials of which properties are sufficient to meet the requirements. Because the plasma facing components are severely exposed to the high heat load and particles with high energy from fusion plasma, the high melting point metal such as a tungsten material is expected as a candidate material. In this study, high energy ions are irradiated to the tungsten joining materials to apply them as an advanced structure material to the next fusion experimental devices. The relationship among the mechanical properties, the microstructures and the effects of radiation damage at the boundary parts of tungsten are made clear by an ultra micro hardness tester, SEM and TEM. And the thermal responses of the tungsten joining materials are also evaluated by electron beam heating tests.
