Abstract
The microstructures of the sliding surfaces and subsurfaces of some plasma-sprayed ceramic coatings (Cr 2O 3 ∗, TiO 2, Al 2O 3, Al 2O 350%TiO 2, WC18%Co) have been inspected using scanning acoustic microscopy (SAM). The results show that SAM is an effective tool for detecting non-destructive subsurface flaws and deformations which could not be seen by traditional optical microscopy or scanning electron microscopy (SEM). SAM can, therefore, be used to develop understanding of the relationship between tribological behaviour and surface and subsurface changes. It is found that propagated flaws may be found just below the deformation region of the surface. The Cr 2O 3 ∗ coating has a very strong tendency to cohesion, which may increase resistance to wear. Some relationships between TiO 2, Al 2O 3, Al 2O 350%TiO 2, WC18%Co coatings and their tribological changes have been built up.
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