The indentation thermal shock behavior of laminated ZrB2–SiC ceramics with strong interfaces

Abstract

The thermal shock behavior of laminated ZrB 2-SiC ceramics with strong interfaces has been investigated by indentation-quench method through experiments and modeling, and was compared with that of a reference monolithic ZrB 2-SiC ceramic. The residual stress formed in the layers of laminated ZrB 2-SiC ceramics was also quantified by indentation technique. Results obtained by indentation-quench tests show that the monolithic and laminated ZrB 2-SiC ceramics present a similar crack growth behavior with increasing temperature difference. Nevertheless, the critical temperature difference, ΔTc, of laminated ZrB 2-SiC ceramics is much higher than that of the monolithic ZrB 2-SiC ceramic. A theoretical model considering all the stress intensity factors at the surface crack tip during thermal shock was established to analyze the mechanism of indentation thermal shock, which is in good agreement with the

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