Abstract
The oxidation mechanism of ZrB2–MoSi2–AlN composite ceramics has been studied in the range 1550–1680°C. The oxidation stages and scale structure and phase composition have been established. Two main scale layers have been found. The outer layer forms at ~1550°C. It consists of SiO2 (β-cristobalite) and an Al2O3–SiO2 solid solution containing MoO3. At 1680°C, a layer of crystalline zirconium dioxide grains forms at the boundary with the initial ceramic surface. This layer is an effective protective barrier for oxygen diffusion into the sample.
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