Self-healing improvement strategy of thermally sprayed MoSi₂ coating at 1773 K: From calculation to experiment

To improve the limited oxidation resistance of thermally sprayed MoSi₂ coating at 1773 K, multiple and multiscale simulation methods as well as experiments verification were adopted to design appropriate modification strategy. Based on viscosity calculation, MoSi₂-mullite system which could form aluminosilicate glass, was considered. Compared with MoSi₂ coating (80 h, −2.1 wt.%), mullite modified MoSi₂ coating exhibit improved self-healing ability and anti-oxidation performance (+2.6 wt.%). The improvement of self-healing ability was concerned with the deconstruction of Al atoms on the Si–O rings in the amorphous SiO₂ and the formation of Al–Si–O glass with lower viscosity (10^4.0 Pa·s).