Abstract
Zirconia coatings are widely used for the thermal protection of high-temperature components in gas turbine and diesel engines. In advanced engines, however, the ceramic coatings have to serve as both thermal and chemical barriers. A 3 kW CO 2 laser was successfully used to achieve surface sealing of plasma-sprayed coatings without serious damage. Nevertheless, excessive and random microcracks restricted the mechanical strength. Moreover, zirconia is not protective against oxygen at high temperatures. Reactive laser treatments were therefore conducted, including alumina powder projection in the laser beam. Addition of alumina during the laser surface melting process led to controlled microcracking and produced a surface alumina-zirconia eutectic which greatly strengthened the treated coating.
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