Effect of minor B modification on the oxidation behavior of MoSi2 alloy at high temperature

MoSi2 alloys modified with and without 1 at. % B were prepared and oxidized at 1250 celcius for 100 h. The B-modified MoSi2 alloy showed a significant 24.2 % reduced mass gain compared with the MoSi2 alloy without B modification. Influence of the minor B addition on the oxidation behavior of MoSi2 alloy was further in-depth investigated with First-principle calculation. The results indicate that the added B, on one hand, enhances the O adsorption capacity and diffusion activation energy of MoSi2 alloy, on the other hand, facilitates the formation and stabilization of the silica scale on the surface.

Automated summary

MoSi2 alloys modified with and without 1 at. % B were oxidized at 1250°C for 100 hours. The B-modified MoSi2 alloy exhibited a significant 24.2% reduction in mass gain compared to the MoSi2 alloy without B modification. The influence of minor B addition on the oxidation behavior of the MoSi2 alloy was further investigated using First-principle calculation, revealing enhanced O adsorption capacity, diffusion activation energy, and the formation/stabilization of silica scale on the surface.