Zircon-Based Ceramics Composite Coating for Environmental Barrier Coating |
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Authors: | M Suzuki S Sodeoka T Inoue |
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Affiliation: | (1) National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba Ibaraki, 563-8569, Japan |
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Abstract: | Studies on plasma spraying of zircon (ZrSiO4) have been carried out by the authors as one of the candidates for an environmental barrier coating (EBC) application, and
had reported that substrate temperature is one of the most important factors to obtain crack-free and highly adhesive coating.
In this study, several amounts of yttria were added to zircon powder, and the effect of the yttria addition on the structure
and properties of the coatings were evaluated to improve the stability of the zircon coating structure at elevated temperature.
The coatings obtained were composed of yttria-stabilized zirconia (YSZ), glassy silica, whereas the one prepared from monolithic
zircon powder was composed of the metastable high temperature tetragonal phase of zirconia and glassy silica. After the heat
treatment over 1200 °C, silica and zirconia formed zircon in all coatings. However, coatings with higher amounts of yttria
exhibited lower amounts of zircon. This resulted in the less open porosity of the coating at elevated temperature. These yttria-added
coatings also showed good adhesion even after the heat treatment, while monolithic zircon coating pealed off. |
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Keywords: | environmental barrier coating (EBC) plasma spray yttria zircon zirconia |
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