Damage process of resolidified part on CVD-W coated molybdenum under high heat load

In view of the recent interest in high-Z metals as plasma facing materials, a high purity CVD-W (99.99998%) coated molybdenum material was prepared. The specimens had been melted at the joint interface under high heat load were made in order to prove the change. Then heat load experiments were performed on these specimens using an electron beam. As the results, the formation of the W-Mo alloy on the heat-affected surface leads the significant weight loss in the temperature range around 2500 °C. But in the temperature range around 2000 °C, the weight loss did not occur. In this experiment, we also carried out a research into the diffusion behavior of a high purity CVD-W/Mo system. These results indicated that the thermal and adhesion properties between the molybdenum substrate and the high purity CVD-W coating were good under high heat loads.