Abstract
Alumina coatings were reactively r.f. sputtered onto cast iron substrates and their wear behaviour under unlubricated conditions was investigated using a model wear test (Timken test). The wear behaviour of the cast iron substrates was improved.The influence of the sputter cleaning process and the deposition pressure on the wear properties of the alumina coatings was investigated. The presence of oxygen in the sputter cleaning atmosphere and the use of a prolonged cleaning time can improve the wear behaviour. A reduction in the deposition pressure leads to a marked improvement in the wear properties of the coatings. This seems to be due to the better adhesion of the low pressure coatings which is caused by higher compressive residual stresses.
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