Abstract
The very low thermal conductivity of plasma-sprayed ceramic coatings can be explained in terms of a model for the coating microstructure involving limited regions of good contact between lamellae. The non-contact regions may be regarded as very thin planar pores which have limited thermal conductance at low temperatures because their width is comparable with the mean free path of the gas molecules within them. At higher temperatures there is a radiative contribution across the pores which results in a smaller temperature coefficient of thermal conductivity than for a sintered ceramic. Heating at high temperatures results in changes in the shape of the planar pores and a large increase in the thermal conductivity.
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