Abstract
The hardness and indentation damage of chemical vapour-deposited SiC coating/graphite substrate composites have been studied. Experimental results indicate that hardness is a non-linear function of coating thickness, and is not significantly affected by the changes in the magnitude of the residual stresses in SiC coating. The size of indentation lateral crack, observed using optical microscopy, varies with coating thickness. Acoustic emission spectra show that thinner coatings suffer more extensive fracture as compared with thicker coatings.
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