<p>The performance of thermal barrier coatings (TBCs) was limited by the formation of thermally grown oxide (TGO). Excessive growth of TGO could lead to the coating delamination and spallation, thereby significantly reducing the lifetime of TBCs. In this study, the composite powders (15 wt.% Ti₃SiC₂-CYSZ) were melted into the TBCs by laser alloying to obtain the self-healing TBCs. The microstructure, phase composition and TGO growth behavior of the self-healing TBCs during high-temperature cyclic oxidation were investigated. Results indicated that the high-temperature oxidation resistance of the Ti₃SiC₂-self-healing TBCs was better than that of the as-sprayed TBCs. The Ti₃SiC₂-self-healing TBCs primarily formed TiO₂ as oxidation products, with relatively low amounts of SiO₂. In the early stages of oxidation, the TGO growth rate of the Ti₃SiC₂-self-healing TBCs was higher than that of the as-sprayed TBCs. However, as oxidation time progressed, the oxidation products of Ti₃SiC₂ gradually filled the cracks within the coating, thereby realizing self-healing effect and impeding oxygen penetration, which slowed further TGO growth. Ultimately, the Ti₃SiC₂-self-healing TBCs exhibited a 37% reduction in TGO thickness compared with the as-sprayed TBCs, demonstrating superior high-temperature oxidation resistance. This study provided a new technological approach to enhancing the high temperature stability and durability of TBCs.</p>