engleski

Characterisation of ZrO_2 layers deposited on Al_2O_3 coating

The paper describes a method of coating combining two different layer types. The first layer is Al_2O_3 produced by plasma spraying with a thickness of around 200 μ m which was deposited on a stainless steel substrate. Subsequently, ZrO_2 layers were deposited on to the Al_2O_3 coating by a sol– gel process using a dip coating technique. The dip coating process was repeated in order to see the influence of the number of ZrO_2 layers. Moreover, the effect of annealing temperature was investigated. In order to study their tribological behaviour, the coatings were subjected to micro-scale abrasion, scratch testing and ball-on-disc tests. The result shows that sol– gel ZrO_2 top layers reduce friction and enhance the wear resistance of the coating system.

Abrasion; Sol– gel; Thermal spray coatings; Wear testing; Scratch testing

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