Abstract
A water-quenching technique was adopted to evaluate the thermal shock behavior of as-sintered and pre-oxidation Zr 2Al 4C 5–20 vol.%SiC composites in an air atmosphere. The strength retention of the two kinds of composites was measured after varying temperature (Δ Tc) up to 800 °C. As-sintered Zr 2Al 4C 5–20 vol.%SiC showed rapidly drop in flexural strength above Δ T of 400 °C. However, the pre-oxidation Zr 2Al 4C 5–20 vol.%SiC composite showed a higher retained strength up to 800 °C, and the critical thermal shock temperature difference (Δ Tc) is as high as 660 °C. The main reasons for a great improvement of thermal shock resistance (TSR) were also discussed and analyzed.
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