Thermo-mechanical calculation of vacuum plasma spraying tungsten coating as the plasma facing material for tokamak device

Abstract

Thermo-mechanical simulation of the vacuum plasma spraying tungsten (VPS-W) coating on the actively cooled CuCrZr substrate under the relevant quasi-stationary heat load and transient heat flux for tokamak device, is conducted by finite element analysis (FEA). It is shown that the failure of copper softening is likely to occur at the W/Cu compliant interlayer under a typical quasi-stationary heat load and the surface failure of plastic yield damage to occur at the surface edge under a transient heat flux. In addition, the critical transient heat flux for melting is approximately 0.75 MJ/m 2 for about 0.5 ms. All these results are useful for the design of the plasma facing components (PFCs) and the plasma operation in the future.