Several studies demonstrated that improvements in high
temperature resistance of liquid-phase sintered silicon
carbide can be effectively achieved by using different
sintering aids (e.g., AlN–Y2O3, AlN–Lu2O3) [33,34]. In
the case of sintered T-SiC, Al4SiC4, crystalline phase
with a well-known high oxidation resistance [35], has a
beneficial effect on the high temperature resistance.