Abstract
Taking the hafnium diboride ceramic as an example, the effects of heating rate, cooling rate, thermal shock initial temperature, and external constraint on the thermal shock resistance (TSR) of ultra-high temperature ceramics (UHTCs) were studied through numerical simulation in this paper. The results show that the external constraint has an approximately linear influence on the critical rupture temperature difference of UHTCs. The external constraint prepares a compressive stress field in the structure because of the predefined temperature field, and this compressive stress field relieves the tension stress in the structure when it is cooled down and then it improves the TSR of UHTCs. As the thermal shock initial temperature, a danger heating rate (or cooling rate) exists where the critical temperature difference is the lowest.
Highlights
Ultra-high temperature ceramics (UHTCs) offer a series of good properties including extremely high-melting point as well as chemical and physical stabilities in the ultra-high temperature environment with oxygen
This paper taking the hafnium diboride (HfB2) ceramic as an example, the effects of heating rate, cooling rate, thermal shock initial temperature, and external constraint on the thermal shock resistance (TSR) of UHTCs have been studied in detail
We regard that the UHTC plate rupture once the thermal stress of the superior surface caused by thermal shock is greater than the fracture strength of the materials corresponding to the current temperature
Summary
Ultra-high temperature ceramics (UHTCs) offer a series of good properties including extremely high-melting point as well as chemical and physical stabilities in the ultra-high temperature environment with oxygen. They are the most potential candidates for high-temperature structural applications [1,2,3]. This paper taking the hafnium diboride (HfB2) ceramic as an example, the effects of heating rate, cooling rate, thermal shock initial temperature, and external constraint on the TSR of UHTCs have been studied in detail. The results of this study will help to understand and evaluate the TSR of UHTCs, which used as the thermal protection material and. Give some helpful suggestions about improving the TSR of UHTCs
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