Oxidation behavior of molybdenum alloy coatings at 1200℃

Three coatings of which containing borosilicate glass and being doped with MoSi2 and aluminum powder were prepared on the surface of TZC molybdenum alloy using a coating method, and the oxidation behavior of the coatings at 1200 ℃ was studied using heating furnace, X-ray diffraction analyzer, and scanning electron microscope. The results show that the aluminum powder modified coating has good protective performance within 1 hour, and the oxidation resistance after 2 hours is 69% higher than that without coating protection. Research has found that the cross-section of borosilicate glass and MoSi2 doped coating is mainly composed of a loose structure with alternating distribution of MoO3 and TiO2 after oxidation, while the addition of Al powder changes the phase composition of the oxide film, forming a three-layer structure of outer aluminum silicate, middle cerium titanium oxide, and inner TiO2 and molybdenum silicon compound, making it have excellent antioxidant effect.