A review is presented of recent experimental data on the effect of microstructural and compositional het erogeneity on the thermal diffusivity/conductivity of structural materials for high-temperature applications. These materials include nitrides, carbides, oxides, and various composites. The microstructural and compositional variables include microcracking, solid solution alloying, densification aids, im purities, and the amount, type, distribution, and orientation of dispersed phases. Such variables can be used to tailor the heat transfer properties of a material for specific require ments.
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