Abstract
The oxidation of dense yttrium-silicate-modified and unmodified SiC-based ceramic (YPS-SiC and RMI-SiC) at 1200, 1300, and 1400 °C was studied. Oxide scale formed on the surface protects internal ceramics from further oxidation. Y2Si2O7 promoted the rapid crystallisation of cristobalite and no large catastrophic bubbles were observed. The high-crystallinity oxide scale of YPS-SiC slowed down the diffusion of the oxidant. The results showed the better oxidation resistance of the YPS–SiC ceramic with a thinner oxide scale than RMI-SiC. Based on oxidation thermodynamics and kinetics analysis, oxidation models were established to reveal the oxidation resistance mechanism of yttrium-silicate-modified SiC-based ceramics.
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