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6610 |
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Friday, June 12, 2020, Hall K2 11:00 AM Powders, Wires, Suspensions |
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PS-PVD gadolinium zirconate thermal barrier coatings with columnar microstructure sprayed from sintered powder feedstocks |
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Shan Li* / Beihang University, P.R. China Hongbo Guo / School of Materials Science and Engineering, Beihang University, China Wenting He/ School of Materials Science and Engineering, Beihang University, China Jia Shi/ School of Materials Science and Engineering, Beihang University, China Liangliang Wei/ School of Materials Science and Engineering, Beihang University, China Jian He/ School of Materials Science and Engineering, Beihang University, China |
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The characteristics of powder feedstock are very critical in plasma spray physical vapor deposition (PS-PVD) process to produce a ceramic coating with columnar microstructure. In this study, gadolinium zirconate (GZO) powder feedstocks for PS-PVD process were prepared by solid-state reactions and spray drying. The GZO coating sprayed from the as-prepared powder revealed a low deposition rate of ~4 ¼m·min-1 because the powder couldnt reach to the hottest zone of the plasma plume due to the weak binding between the primary particles. Heat treatment of the powder was performed at temperatures between 1000 °C and 1300 °C to enhance the binding strength and the powder after 1 h heat treatment at 1200 °C exhibited a moderate improved binding strength. The coating sprayed from the powder showed typical columnar structure and nearly stoichiometry composition and a deposition rate of 24 ¼m·min-1 was obtained. |