Abstract

GONZALEZ, Andrés et al. INFLUENCE OF THERMAL SPRAY PARAMETERS ON THE MICROSTRUCTURE OF ZIRCONIA-ALUMINA AND ZIRCONIA-CERIA COATINGS USED AS THERMAL BARRIER. Rev. LatinAm. Metal. Mater. [online]. 2013, vol.33, n.2, pp.272-281. ISSN 0255-6952.

The influence of the spraying parameters on the microstructure of ZrO₂ - 36 wt.% Al₂O₃ y ZrO₂ - 17wt.% CeO₂ coatings was evaluated. The coatings were produced by oxyacetylene flame spraying on substrates of AISI 1020 carbon steel, which had a previous deposited bond coat of 90 wt.% Ni - 5 wt.% Al - 5 wt.% Mo. The studied variables were the standoff distance between the torch and the substrate (7.5, 10 and 12.5 cm) and the influence of two commercial powders: Eutectic Castolin® and Saint Gobain®. It was established that the internal morphology of the powders has a high influence on the microstructure of the coatings while, the spraying distance has a great influence on the microhardness and the porosity of the obtained zirconia-alumina and zirconia-ceria coatings

Keywords : Thermal Barriers; flame spraying; ZrO₂-Al₂O₃; ZrO₂-CeO₂; coatings.

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