In this study, three different types of Al2O3 coatings wereprepared by atmospheric plasma spraying. Some physicalproperties of these coatings were measured. Microstructureand wear morphologies of coatings were investigated byscanning electron microscopy (SEM) and optical microscopy(OM). The tribological behaviour of various coatings againststainless steel using a block-on-ring configuration wereinvestigated in terms of the microstructure, physical propertiesespecially the thermal diffusivity of coatings and theevaluation of tribological heat. Results revealed that the wearresistance of coatings used in this work showed a highdependence on their thermal diffusivity rather than otherproperties such as porosity, microhardness and bond strength:the higher the thermal diffusivity of a ceramic coating, thebetter is its wear resistance.
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