Decrease of pores in tritium permeation barriers is one of the most important problems to be addressed for the proper functioning of the fusion reactor. In this paper, a self-healing composite coating composed of TiC+mixture (TiC/Al2O3) +Al2O3 was developed to solve this problem. The coating was deposited on martensitic steels by plasma spraying with a thickness of 100μm. After heat-treatment, the morphology and phase of the coating were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The corrosion resistance of the coating before and after heat treatment was examined by electrochemistry techniques. The results showed that the TiC+mixture (TiC/Al2O3)+Al2O3 coating exhibited good adhesion to the substrate and a perfect self-healing ability with the porosity decreased by 90% after heat-treatment. The corrosion resistance of the coating increased evidently after the heat treatment. The oxidation/expansion of TiC in the coating played an important role in the sealing of pores.

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