Abstract
Indentation-quench method is generally used to evaluate the thermal shock resistance of dense ceramics, whereas it is not suitable for porous ceramics. In this paper, we designed a wedge-shaped specimen, as a substitute for the disk-shaped sample, to evaluate the thermal shock behavior of porous ZrB2-SiC ceramics. This method could realize the direct observation of the thermal-shock crack propagation and achieve the measurement of the crack-growth percentage as quenching temperature difference increases. The observation provides the microstructure-evidence of the effect of pores on thermal shock cracking and allows getting an insight into the crack propagation process in porous ceramics.
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