Calculational Evaluation of Mechanical, Thermodynamic and Thermal Properties of Tungsten/Graphene/Tungsten as Plasma Facing Materials

Tungsten metal is currently the most promising first wall material for Tokamak devices. The addition of graphene can improve its anti-radiation performance, but the stability and performance changes of the system in the face of instantaneous thermal shock and steady-state thermal fluctuation brought by plasma operation have not been studied. In this paper, the W/Graphene/W model is designed to calculate its mechanical properties at zero degrees and thermal properties at high temperatures. At the same time, we considered two extreme cases - the hydrogenation of graphene brought about by the entry of hydrogen ions into the material and the reaction of carbon atom reacts with tungsten atom at high temperature, which would convert graphene to graphane and W 2 C. The calculation results show that the W/Graphene/W system maintains good rigidity and brings better ductility at zero degrees. At high temperatures, it maintains the same level of bulk modulus as metal tungsten and increases the minimum thermal conductivity, allowing bring better heat dissipation. But it also brought a slight decrease in thermodynamic stability and an increase in the coefficient of thermal expansion