Monoclinic zirconia distributions in plasma-sprayed thermal barrier coatings |
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| Authors: | M J Lance J A Haynes M K Ferber W R Cannon |
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| Affiliation: | (1) Oak Ridge National Laboratory, 37831-6068 Oak Ridge, TN;(2) Department of Ceramic and Materials Engineering, Rutgers University, The State University of New Jersey, 08854-8065 Piscataway, NJ |
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| Abstract: | Phase composition in an air plasma-sprayed Y2O3-stabilized ZrO2 (YSZ) top coating of a thermal barrier coating (TBC) system was characterized. Both the bulk phase content and localized
pockets of monoclinic zirconia were measured with Raman spectroscopy. The starting powder consisted of ∼15 vol.% monoclinic
zirconia, which decreased to ∼2 vol.% in the as-sprayed coating. Monoclinic zirconia was concentrated in porous pockets that
were evenly distributed throughout the TBC. The pockets resulted from the presence of unmelted granules in the starting powder.
The potential effect of the distributed monoclinic pockets on TBC performance is discussed. |
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| Keywords: | Raman microscopy TBC HOSP plasma spraying zirconia |
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