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Desenvolvimento de revestimentos multicamada para aplicações mecânicas. “Develo...
Portinha, Aníbal Jorge FernandesTese de Doutoramento em Ciências (Especialidade em Física) ; Este trabalho consiste essencialmente no desenvolvimento, produção e caracterização de revestimentos para aplicações mecânicas de alta temperatura. Desta forma desenvolveram-se novos revestimentos nanoestructurados, nanolaminados, multicamada e graduados à base de zirconia (ZrO2) parcial e totalmente estabilizada para protecção de componentes metálic...
Evaluation of laser-glazed plasma-sprayed thermal barriercoatings under high te...
Batista, C.; Portinha, Aníbal; Ribeiro, R. M.; Teixeira, Vasco M. P.; Oliveira, C. R.Thermal Barrier Coating (TBC) systems are frequently used in gas turbine engines to provide thermal insulation to the hot-section metallic components and also to protect them from oxidation, hot corrosion and erosion. Surface sealing treatments, namely laser-glazing, have been showing a high potential for extending in-service lifetimes of these systems by improving chemical and thermo-mechanical resistance. In ...
Morphological and microstructural characterization of laser-glazedplasma-spraye...
Ribeiro, R. M.; Teixeira, Vasco M. P.; Costa, M. F.; Oliveira, C. R.; Batista, C.; Portinha, AníbalLaser glazing has been revealing a high potential for the improvement of plasma-sprayed (PS) thermal barrier coatings (TBCs) by reducing surface roughness, eliminating open porosity on the surface and generating a controlled segmented crack network, although the relationship of the processing parameters with the resultant properties has not yet been completely established. In this investigation, TBCs consisting...
Surface laser-glazing of plasma-sprayed thermal barrier coatings
Batista, C.; Portinha, Aníbal; Ribeiro, R. M.; Teixeira, Vasco M. P.; Costa, M. F.; Oliveira, C. R.Atmospheric plasma-sprayed (APS) ZrO2–8%WtY2O3 thermal barrier coatings (TBCs) were subjected to a CO2 continuous wave laser-glazing process in order to generate an external dense layer produced by different processing parameters. For that purpose, different beam scanning speeds and track overlapping were chosen. Surface roughness has been reduced significantly after laser-glazing. Despite the surface crack net...
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