Phases in the SiC–Al2O3–Y2O3 system were confirmed.
Three yttrium aluminates of YAM, YAP and YAG were formed.
The YAP phase seemed stable at 1450–1700 °C.
SiC was compatible with each of the yttrium aluminates and the oxides.
YAM can be a suitable sintering aid to the SiC ceramics.