Abstract
A MoSi2 coating and a B‐modified MoSi2 coating were prepared on pure Mo by halide activated pack cementation (HAPC) method. The B‐modified MoSi2 coating consisted of a thick MoSi2 outer layer with MoB precipitates distributed in its inner part, a Mo5Si3 second layer, a MoB third layer, and a Mo2B inner layer. Both coatings were oxidized isothermally at 873, 1523, and 1773 K. It was found that pest oxidation did not occur in both coatings at 873 K for full cover scales could form on their surfaces after 100 h oxidation. During oxidation, B atoms in the B‐modified MoSi2 coating diffused outward to the coating surface and oxidized to low viscose B2O3, which promoted the formation of full cover scale and significantly reduced the volatilization of MoO3 at 1523 K, while that effect was negligible at 1773 K for silica had good fluidity at such a high temperature. It was also found that the MoB layer of the B‐modified MoSi2 coating retarded the inward diffusion of Si from MoSi2 to the substrate, which could increase the coating oxidation‐resistant lifetime.
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