Impermeability of Y3Al5O12 ceramic against molten glassy calcium-magnesium-alumina-silicate |
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| Authors: | Zhaolu XUE Yue MA Shengkai GONG Hongbo GUO |
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| Institution: | School of Materials Science and Engineering, Beihang University, Beijing 100083, China;Key Laboratory of High-Temperature Structure Materials and Coatings Technology (Ministry of Industry and Information Technology), Beihang University, Beijing 100083, China |
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| Abstract: | Degradation of thermal barrier coatings (TBCs) caused by calcium-magnesium-alumina-silica (CMAS) glassy penetration is becoming an urgent issue for TBCs industrial applications. In this work, yttrium aluminum garnet (Y3Al5O12, YAG) nano-powders were synthesized through a chemical co-precipitation route. The resistance of YAG ceramic to glassy CMAS infiltration at 1250?°C was evaluated. YAG ceramic bulk sintered at 1700?°C for 10?h was comprised of a single garnet-type Y3Al5O12 phase. The molten CMAS glass was suppressed on the surface of the YAG ceramic at 1250?°C. A chemical reaction between YAG and the molten CMAS glass did not occur at 1250?°C for 24?h, suggesting that YAG could act as an impermeable material against glassy CMAS deposits in the TBC field. |
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| Keywords: | Calcium-magnesium-alumina-silicate (CMAS) Ceramics Thermal barrier coating Yttrium aluminum garnet Zirconia |
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