Microstructural Evolution of Thermal Barrier Coatings during Isothermal Oxidation |
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| Journal | Key Engineering Materials (Volume 333) |
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| Volume | Functional Gradient Ceramics, and Thermal Barriers |
| Edited by | Marc Anglada et al. |
| Pages | 269-272 |
| DOI | 10.4028/www.scientific.net/KEM.333.269 |
| Citation | Alicia Salazar et al., 2007, Key Engineering Materials, 333, 269 |
| Online since | March, 2007 |
| Authors | Alicia Salazar, J. Gómez-García, P. Poza, V. Utrilla |
| Keywords | Heat Treatment, Oxidation, Scanning Electron Microscope (SEM), TEM, Thermal Barrier Ceramic Coatings, Thermal Spray, X-Ray Diffraction (XRD) |
| Abstract | 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 ºC 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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