Influence of high power density plasma irradiation on the boron carbide coating on tungsten

13th International Conference on Films and Coatings

Begrambekov, L.B.^1 ; Grunin, A.V.^1 ; Puntakov, N.A.^1 ; Sadovskiy, Ya.A.^1 ; Utkov, N.S.^1

National Research Nuclear University (MEPhI), Moscow

115409, Russia^1

关键词: Boron carbide coatings;    Direct plasma;    High power density;    Local melting;    Power densities;    Sample areas;    Temperature range;    Tokamak plasmas;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/857/1/012003/pdf
DOI  :  10.1088/1742-6596/857/1/012003

来源: IOP

【 摘 要 】

The paper considers an influence of T-10 tokamak plasma disruption on boron carbide (B4C) coating on tungsten. The power density of coating irradiation reached 100 MW/m2. The relief and composition of the boron carbide coating sample areas heated up to different temperature due to influence of disruption is determined. Conclusion is made that B4C does not change integrity, when heated to temperatures of up to 2000 K. Local melting was observed in areas heated up to 2500 K. In the range of 2500-3600 K most of the coating was melted and collected into droplets. Composition rate is reduced to B:C = 1:1. In all temperature ranges the coating remained continuous and provided protection of tungsten from direct plasma irradiation.