Preparation and characterization of a novel nanostructured Yb2Si2O7 feedstock used for plasma-sprayed environmental barrier coatings |
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| Affiliation: | 1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China;2. Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing, 100081, China |
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| Abstract: | In this work, the preparation process of a novel nanostructured Yb2Si2O7 feedstock for plasma-sprayed environmental barrier coatings (EBCs) was explored. Results show that sintering parameter and mass ratio between Yb2O3 and SiO2 significantly affect the solid-state reaction process for the synthesis of Yb2Si2O7 feedstocks. The increase of SiO2/Yb2O3 ratio in the spray-dried granules can reduce the average grain size of β-Yb2Si2O7 phase and the second phase content of the sintered powder. Nanostructured Yb2Si2O7 feedstocks with high content of β-Yb2Si2O7 phase and good sprayability were successfully obtained after plasma treatment. The nanostructured Yb2Si2O7 coatings can be gained using as-synthesized feedstocks via plasma spraying, which verifies the applicability of nanostructured Yb2Si2O7 feedstocks. |
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| Keywords: | Nanostructured feedstock Solid-state synthesis Plasma spraying Environmental barrier coatings |
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