Surface modification and oxidation kinetics of hot-pressed AlN–SiC–MoSi2 electroconductive ceramic composite

摘要: Abstract The effects of oxidation on the microstructural modification and electrical resistivity mechanical strength a hot-pressed AlN–SiC–MoSi2 electroconductive ceramic composite were studied. kinetic was also evaluated. After at temperatures below 1000 °C samples do not gain weight, due to simultaneous formation SiO2 evaporation MoO3 formed by MoSi2. However, AlN/SiC matrix disables “pesting” phenomena degradation, despite fact that these MoSi2 oxidizes rapidly. At above 1000 °C, gains weight protective mullite layer surface, provides good resistance for use higher temperatures. kinetics follows parabolic law. possible rate-controlling mechanism is diffusion oxygen through mullite-rich surface oxide scale.