There are many methods available which provide chemical
composition and other information about coatings. However, simple chemical
composition is not a sufficient indication of a coating’s properties to enable
its tribological behaviour to be predicted with a satisfactory degree of
confidence. This is especially true in the case of ceramic coatings.
Coatings can be composed of grains, i.e. they can be
polycrystalline, either random or textured and have a preferred orientation,
and they may even be epitaxial.
The appropriate analysis technique for a particular coating
will thus depend on its morphological nature, as well as aspects such as its
thickness, surface finish and actual composition.
In tribology, increasing attention is being focused on
tribochemical reactions, and the choice of surface’s analytical technique will
also be determined by its ability to detect and evaluate the reaction products
and transfer layers which often control contact behaviour.
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