Abstract
The oxidation mechanism of ZrB 2–SiC composites was investigated based on a combination of theory and experiments. The oxidation reactions, microstructure evolution, scale stability and temperature limit were examined in our research and a good correspondence was obtained between theoretical predictions and experimental results. Microstructure evolution and stability are significantly dependent on both temperature and composition. SiO 2 is thermochemically stable below 1800 °C and will lose its protective properties at temperatures above 2300 °C. The temperature limit for ZrB 2–SiC composites is strongly dependent on the vapor pressure of the gaseous products and volume content of ZrB 2.
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