Abstract
In this study, the oxidation behaviours of Y, Sm and Y/Sm doped α-SiAlON ceramics are investigated to examine the oxidation kinetics. The oxidation tests are carried out at 1300–1450°C for different holding times (6–72 hours). Measurements of weight gain and observations of oxidized surfaces were made. The results show that up to 1400°C, oxidation resistance of Sm-doped samples is better than dual cations (Y/Sm) doped compositions even though the former has the higher amount of grain boundary phase. Results are discussed based on grain boundary phase, oxidation morphology and thickness.
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