Abstract
Laser surface treatment of A12O3 plasma sprayed coatings is studied in this paper from an experimental viewpoint. A CO2 laser operating in continuous mode is used to refuse a thick layer of 0,3 mm thickness. The changes in microstructure, microhardness and adherence caused by the laser treatment allows a better wear behaviour of this coating after laser treatment. The initial porosity of A12O3 plasma sprayed coating is considerably reduced after laser treatment. However in this case few vertical cracks appear. This fact can be reduced by using a preheating of the specimens to decrease the thermal effects of the laser treatment.
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