Abstract
Based on the theory of heat conductivity and thermo-elasticity a detailed fracture mechanical thermal shock description is given, which emphasizes the transient nature of this phenomenon. Resulting from these considerations, various thermal shock resistance parameters are introduced that depend upon crack initiation and crack arrest criteria. The role of thermal shock experiments is discussed. Si 3N 4 and SiC as two important high temperature structural ceramics are studied with regard to thermal shock applications. Experimental results from a developed high temperature thermal shock apparatus are shown and compared with water quench experiments. Measurements of final crack lengths strongly support the energy balance criterion for crack arrest.
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