High heat flux test of SiC coated doped graphite

Doped graphites containing B, Si and Ti dopants with improved mechanical and thermal properties are developed as divertor plates in experimental advanced superconducting tokamak (EAST) device. SiC coatings with a grading distribution along the depth up to 100 μm from the surface were applied on the doped graphites by chemical vapor reaction (CVR) method in order to reduce the carbon impurities emitted from the surface of doped graphites during long pulse plasma discharge. High heat flux test on SiC coated graphites were carried out with an active cooling test (ACT) facility. Results show that SiC coated doped graphites can handle heat flux up to 6 MW/m² while keeping structural integrity. The abrupt increase of surface temperature and the eroded pot on the surface implied that SiC coatings acted as a heat transfer barrier when irradiated with heat flux of 6 MW/m².