High-Performance MoSi ₂ -20 mol % Mo ₅ Si ₃ Composite Ceramics: Sintering Preparation, Experimental Characterization, and Theoretical Calculation

, respectively, both superior to most molybdenum silicide-based materials prepared by conventional methods. It also possesses excellent heat/electrical transfer performance. Notably, the sintered samples showed no significant mass gain in an air atmosphere at 1500 °C, exhibiting excellent high-temperature oxidation resistance. The underlying mechanism is revealed by ab initio molecular dynamics simulations. This study provides a new route for preparing high-performance molybdenum silicide-based composite ceramics and lays a theoretical and experimental foundation for their application in extreme environments, such as hot-section components in aerospace engines and missile nozzles.