Abstract
Some wear-resistant ceramic and cermet coatings, such as Al 2O 3, TiO 2, Al 2O 3-TiO 2, Cr 2O 3, Cr 3C 2-NiCr and cobalt-cladded WC, were prepared by the arc plasma spraying technique. In this paper optimized spraying parameters of various coatings are briefly described. Some physical properties of these coatings materials were measured. Wear tracks and damage forms were studied by microscopy and scanning electron microscopy techniques. Wear damage mechanisms of these coatings are discussed together with the relationship between wear damage of the coatings and their microstructure, physical properties and especially their thermal diffusivity. The higher the thermal diffusivity of a coating, the better is its wear resistance. The wear resistance of coatings has no obvious relationship with many other physical properties. The pore size, shape and distribution as well as the crack texture in the coatings have important bearings on their wear resistance. Approaches to improve wear-resistant coatings are presented.
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