Abstract
In this paper, the friction and wear mechanisms of plasma-sprayed ceramic coatings (Cr 2O 35%SiO 23%TiO 2, Cr 3C 212%Ni3%Cr, TiO 2, Al 2O 3-(Metco), WC18%Co, PSZ, Al 2O 3 (made in China)) at 450 °C have been studied. It has been determined that the friction and wear behaviour, such as fatigue spalling, plastic deformation and adhesive transfer, of ceramic coatings is similar to that of metals. Under high temperature (450 °C), the dry friction coefficients of ceramic coatings were much higher than the lubricated friction coefficients of ceramic coatings. At the same time the wear mechanisms and the frictional surface topography under dry friction condition were much different from those under lubricated conditions. Adhesive transfer occurred easily under dry friction conditions. However, it was rather difficult for adhesive friction to take place when lubricated.
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