Abstract
A B-modified Mo3Si coating was fabricated on a pure Mo substrate by the plasma transferred arc (PTA) cladding process. The microstructure, phase constitution, and oxidation resistance of the coating were studied to determine the effect of B addition. The microstructure characterization shows that the coarse Mo3Si dendrites and few small dispersed Mo5Si3 particles are uniformly distributed in the Mo3Si/Mo5SiB2 eutectics matrix. Compared to both the pure Mo and Mo3Si reference materials, the B-modified Mo3Si coating exhibits a drastic improvement in oxidation resistance, which can be ascribed to a complete surface coverage by a borosilicate glass scale produced during the high temperature oxidation exposure to air at 1300 °C. Upon oxidation small additions of B into Mo3Si compound promotes the rapid formation of a dense and continuous borosilicate glass scale and improves its viscous flow on the coating surface, restricting the inward oxygen diffusion to the oxidation interface, and thereby enhancing its oxidation resistance.
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