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Thermophysical properties of Yb2O3 doped Gd2Zr2O7 and thermal cycling durability of (Gd0.9Yb0.1)2Zr2O7/YSZ thermal barrier coatings |
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| Affiliation: | 1. School of Materials Science and Engineering, Beihang University, China;2. Beijing Key Laboratory for Advanced Functional Material and Thin Film Technology, Beihang University, No. 37, Xueyuan Road, Beijing 100191, China;1. The Key Laboratory of Inorganic Coating Materials, Chinese Academy of Sciences, Shanghai 201899, China;2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China;1. School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing 100191, China;2. Key Laboratory of High-Temperature Structure Materials and Coatings Technology (Ministry of Industry and Information Technology), Beihang University, No. 37 Xueyuan Road, Beijing 100191, China;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;4. ICMMO/SP2M, UMR CNRS 8182, Université Paris-Sud, 91405 Orsay Cédex, France;1. Department of Engineering Science, University West, Sweden;2. Treibacher Industrie AG, Austria |
| Abstract: | (Gd1−xYbx)2Zr2O7 compounds were synthesized by solid reaction. Yb2O3 doped Gd2Zr2O7 exhibited lower thermal conductivities and higher thermal expansion coefficients (TECs) than Gd2Zr2O7. The TECs of (Gd1−xYbx)2Zr2O7 ceramics increased with increasing Yb2O3 contents. (Gd0.9Yb0.1)2Zr2O7 (GYbZ) ceramic exhibited the lowest thermal conductivity among all the ceramics studied, within the range of 0.8–1.1 W/mK (20–1600 °C). The Young's modulus of GYbZ bulk is 265.6 ± 11 GPa. GYbZ/YSZ double-ceramic-layer thermal barrier coatings (TBCs) were prepared by electron beam physical vapor deposition (EB-PVD). The coatings had an average life of more than 3700 cycles during flame shock test with a coating surface temperature of ∼1350 °C. Spallation failure of the TBC occurred by delamination cracking within GYbZ layer, which was a result of high temperature gradient in the GYbZ layer and low fracture toughness of GYbZ material. |
| Keywords: | Thermophysical properties Electron beam physical vapor deposition (EB-PVD) Thermal barrier coatings (TBCs) Thermal cycling |
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