Research progress in modification of MoSi 2 coatings on surface of refractory metals and their alloys: a review

Refractory metals and their alloys have excellent properties such as high‐temperature strength and corrosion resistance. It is widely used in aerospace, electronics industry and other fields. However, refractory alloys are prone to oxidation and failure in high‐temperature service environments. The preparation of a MoSi 2 antioxidant coating is an effective method for improving the protective ability of refractory metals at high temperatures. However, although MoSi 2 coatings have many advantages, it is difficult to meet the increasingly stringent service requirements. To address these challenges, researchers have used different elements to modify a single MoSi 2 coating and improve its overall oxidation resistance. In this study, the roles of one or more elements (Si, B, N, Zr, Al, W, Hf, Y, Ti and Cr) in MoSi 2 coatings are systematically reviewed. Simultaneously, the mechanism of single or multiple synergistic modification of MoSi 2 coatings with different elements was discussed. Finally, the development prospects of MoSi 2 coating modification of refractory metals and their alloys are discussed.