Microstructural feature and thermal shock behavior of hot-pressed ZrB_2-SiC-ZrO_2 composite

摘要

This paper investigated the thermal shock behavior of hot-pressed zirconium diboride (ZrB_2-10vol%SiC-10vol%ZrO_2) composite by means of water quenching. Under single thermal shock, the retained strength presented sharp degradation with the temperature difference (AT) above 500 ℃. Differently, the retained strength decreased rapidly with AT above 300 ℃ under five-cycle thermal shock. Analysis of the microstructural features also showed discrepancy for the composite under different thermal shock conditions. Further discussion found that the thermal shock resistance of ZrB_2-SiC-ZrO_2 composite was influenced by the intrinsic properties as well as the oxidation behavior under high temperature.