Abstract
AbstractIn part I of this paper basic criteria for the improvement of thermal shock resistance of engineering ceramics were summarized. Moreover, data were presented about thermal shock resistance to fracture initiation and about thermal cycling behaviour of high‐strength engineering ceramics. In this part the influence of microstructure on thermal shock resistance to fracture initiation is discussed. This subject also includes the discussion of the influence of various microstructural variables on the mechanical and thermal properties which mainly control the thermal shock resistance to fracture initiation. These relations are demonstrated with Al2O3, but in particular by the example of dense and porous reactionbonded Si3N4. Furthermore, some other factors affecting thermal shock resistance are outlined: the influence of temperature dependence of properties on the microstructural effects on thermal shock resistance, and the influence of data scatter of the initial strength on the strength behaviour after thermal shock.
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