Thermal shock resistance of ZnS wave-transparent ceramic considering the effects of constraint and pneumatic pressure

In order to study the combined effect of aerodynamic heating, pneumatic pressure and external constraint on the thermal shock resistance (TSR) of ZnS wave-transparent ceramic in its actual service process, the theoretical model is established by introducing the analytical solution of transient heat conduction problem of ZnS plate under aerodynamic heating into its thermal stress field model. The numerical simulation is also conducted not only to examine the theoretical model, but also to study how to improve the TSR. The influences of constraint and pneumatic pressure are studied and the effects of loosing constraint and active cooling are focused on. The study shows that the critical rupture temperature difference of simply supported ZnS plate will form wave peak; the TSR of ZnS plate is obviously optimized when loosing constraint method has been adopted, and the effect of pneumatic pressure on TSR is closely related to the change of failure region; active cooling is an effective way to improve the TSR of ZnS plate and the stronger pneumatic pressure, the better TSR, but active cooling can't be too violent. (C) 2014 The Ceramic Society of Japan. All rights reserved.