Abstract
Tungsten materials are particularly expected to be used as a target material of the Japan Proton Accelerator Research Complex (J-PARC) and a plasma facing material of the International Thermonuclear Experimental Reactor (ITER), since they have high heat resistance, high thermal shock resistance, high thermal conductivity and excellent erosion resistance. On the other hand, they are low fracture toughness and hard workability, and the joining technique with cooling structures is not established yet. In this study, a new working technique by using of the superplasticity and a joining method with a cooling structures are researched for the improvement of their weak points. The Superplasticity of tungsten materials are evaluated by tensile test at high temperatures. And the thermal responses of the tungsten joining models are also examined.
