Microstructural Evolution of Thermal Barrier Coatings during Isothermal Oxidation

Abstract:

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This paper analyses the degradation of a ceramic top coating 70%ZrO2 – 30%CaO deposited onto a stainless steel AISI 304 by thermal spray, using Ni-6%Al-5%Mo as overlay coating. These thermal barrier coatings were heat treated for 48, 120 and 288 h at 800 °C to evaluate the degradation of these materials by isothermal oxidation. The microstructure evolution during oxidation was analysed by environmental scanning electron microscopy, transmission electron microscopy and X ray microanalysis. A thermally grown oxide layer was observed between the overlay coating and the ceramic top coating after oxidation. This layer was formed by a mixed Al, Ni and Mo oxides.

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Periodical:

Edited by:

Marc Anglada et al.

Pages:

269-272

DOI:

10.4028/www.scientific.net/KEM.333.269

Citation:

A. Salazar et al., "Microstructural Evolution of Thermal Barrier Coatings during Isothermal Oxidation", Key Engineering Materials, Vol. 333, pp. 269-272, 2007

Online since:

March 2007

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$35.00

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