Abstract
Abstract The characteristic high temperature creep behaviour of liquid phase sintered SiC ceramics with Y2O3–AlN and Lu2O3–AlN as sintering additives has been evaluated as a function of composition, microstructure and post-sintering treatment. Creep testing in four-point bending geometry was performed at temperatures between 1200 °C and 1500 °C in air under stresses ranging from 50 to 300 MPa. Grain boundary sliding accommodated by grain boundary diffusion along with some creep cavitations were found to be possible creep mechanisms. A comparative study with reference to the additive system Y2O3–AlN demonstrates significantly improved creep resistance of the Lu2O3-containing ceramics.
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