Calcium-magnesium-alumina-silicate (CMAS) resistant Ba2REAlO5 (RE = Yb,Er, Dy) ceramics for thermal barrier coatings |
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| Affiliation: | 1. School of Materials Science and Engineering, Beihang University, Beijing 100191, China;2. Key Laboratory of Aerospace Materials & Performance (Ministry of Education), Beihang University, No. 37 Xueyuan Road, Beijing, 100191, China;3. School of Materials Science and Engineering, Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin, China;4. Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, No. 92, Weijin Road, Tianjin 300072, China;1. German Aerospace Center (DLR), Institute of Materials Research, Cologne, 51170, Germany;2. Department of Mechanical Engineering, University of Texas at El Paso, El Paso, TX, 79968, USA;1. TU Dresden, Institute of Materials Science (IfWW), D-01062 Dresden, Germany;2. German Aerospace Center (DLR), Institute of Materials Research, D-51170 Cologne, Germany;1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Beijing Institute of Aeronautical Materials, Department 5, P.O. Box 81-5, Beijing 100095, China;1. School of Engineering, Brown University, Providence, RI, 02912, USA;2. Center for Thermal Spray Research, Department of Materials Science & Engineering, Stony Brook University, Stony Brook, NY, 11794, USA;3. Departamento de Ingeniería Mecánica, Energética y de los Materiales, Universidad de Extremadura, 06006, Badajoz, Spain |
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| Abstract: | Calcium-magnesium-alumina-silicate (CMAS) attack has been a great challenge for the application of thermal barrier coatings (TBCs) in modern turbine engines. In this study, a series of prospective TBC candidate materials, Ba2REAlO5 (RE = Yb, Er, Dy), are found to have high resistance to CMAS attack. The rapid formation of a continuous crystalline layer on sample surface contributes to this desirable attribute. At 1250 °C, Ba2REAlO5 dissolve in the molten CMAS, accumulating Ba, RE and Al in the melt, which could trigger the crystallization of celsian, apatite and wollastonite crystals. Especially, the formation of the crystalline layer in the Ba2DyAlO5 sample is the fastest. This study also reveals that Ba is a useful element for altering CMAS composition to precipitate celsian. Thus, doping Ba2+ in yttria partially stabilized zirconia or other novel TBCs might be an attractive way of mitigating CMAS attack. |
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| Keywords: | Thermal barrier coatings (TBCs) Calcium-magnesium-alumina-silicate (CMAS) Crystalline layer |
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