MoSi₂-ZrB₂-SiC antioxidant coatings were prepared on niobium surfaces using industrial waste molybdenum silicide rods, ZrB₂ and SiC as raw materials by SPS. To study the microstructure, phase composition and high temperature oxidation behavior of the coatings at 1000℃, 1200℃, 1400℃ and 1600℃.The results show that an obvious connecting layer is formed between the coating and the substrate prepared from waste molybdenum silicide rods, ZrB₂ and SiC powder. With the increase of oxidation time, the coating gradually thickened with the increase of oxidation temperature, the oxide film gradually increased, the ZrO₂ particles gradually increased, and the transition layer formed between the Nb substrate and the coating gradually thickened. The waste MoSi₂ contains Al₂O₃ and SiO₂, Al₂O₃ has a good modifying effect, while SiO₂ glass promotes liquid-phase sintering and seals defects in the coating. The MoSi₂-ZrB₂-SiC composite coatings have good high-temperature oxidation resistance.

 

reuse; waste molybdenum silicide rods; discharge plasma sintering; oxidation resistance; niobium matrix