Investigation of the Effect of Molybdenum Silicide Addition on the Oxidation Behavior of Hafnium Carbonitride

In this study, the oxidation stability up to 1000 °C in air of Hf(C,N)-MoSi2 composites was explored under non-isothermal and isothermal conditions. Composites with 1, 5, 10, 20% volume fractions were produced by low-energy ball milling subsequent spark plasma sintering. Differential scanning calorimetry (DSC) thermogravimetric (TG) coupled mass spectrometry used reveal staging process depending on additive content. It found that samples containing 1 5 vol% MoSi2 had lowest weight gain best behavior. The results study supported microstructural phase analyses after treatment a furnace. molybdenum disilicide content dense thin protective oxide film surface, consisting hafnium orthosilicate monoclinic HfO2. increase amount contributed formation loose porous layer due concentration volatile MoO3. However, all exhibited higher resistance compared pure Hf(C,N).