Calcium-magnesium-alumina-silicate (CMAS) resistance characteristics of LnPO4 (Ln = Nd,Sm, Gd) thermal barrier oxides |
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| Affiliation: | 1. School of Materials Science and Engineering, Tianjin University, China;2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, China;3. Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, No. 92, Weijin Road, Tianjin 300072, China;1. Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;2. College of Physics and Electronic Information Engineering, Qinghai University for Nationalities, Xining 810007, China;3. Guizhou Radio and Television University, Guiyang 550004, China;1. School of Astronautics, Beihang University, Beijing 100191, China;2. Key Laboratory of Spacecraft Design Optimization and Dynamic Simulation Technologies, Ministry of Education, Beihang University, Beijing 100191, China;3. College of Aerospace Engineering, Chongqing University, Chongqing 400044, China;4. Université de Toulouse, Institut Clément Ader (ICA), CNRS, UMR 5312, UPS, France;1. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China;2. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, PR China |
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| Abstract: | Calcium-magnesium-alumina-silicate (CMAS) attack has been considered as a significant failure mechanism for thermal barrier coatings (TBCs). As a promising series of TBC candidates, rare-earth phosphates have attracted increasing attention. This work evaluated the resistance characteristics of LnPO4 (Ln = Nd, Sm, Gd) compounds to CMAS attack at 1250 °C. Due to the chemical reaction between molten CMAS and LnPO4, a dense, crack-free reaction layer, mainly composed of Ca3Ln7(PO4)(SiO4)5O2 apatite, CaAl2Si2O8 and MgAl2O4, was formed on the surface of compounds, which had positive effect on suppressing CMAS infiltration. The depth of CMAS penetration in LnPO4 (Ln = Nd, Sm, Gd) decreased in the sequence of NdPO4, SmPO4 and GdPO4. GdPO4 had the best resistance characteristics to CMAS attack among the three compounds. The related mechanism was discussed based on the formation ability of apatite phase caused by the reaction between molten CMAS and LnPO4. |
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| Keywords: | Rare-earth phosphates Thermal barrier coatings (TBCs) Calcium-magnesium-alumina-silicate (CMAS) Apatite |
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