Thermophysical performances of Sm2O3-doped Gd3TaO7 oxides for thermal barrier coatings |
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| Affiliation: | 1. Department of Mechanical Engineering, Henan University of Engineering, Zhengzhou 451191, China;2. Department of Environmental and Biological Engineering, Henan University of Engineering, Zhengzhou 451191, China;3. Department of Civil Engineering, Henan University of Engineering, Zhengzhou 451191, China;1. College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;2. State Key Laboratory of Green Building in Western China, Xi’an University of Architecture and Technology, Xi’an 710055, China;3. School of Resources Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;4. College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, UK;1. Xi''an University of Technology, Xi’an 710048, PR China;2. Shaanxi Province Key Laboratory of Corrosion and Protection, Xi''an University of Technology, Xi’an 710048, PR 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, Shanghai Jiao Tong University, Shanghai 200240, China;2. Engineering Research center of Nano-Geo Materials of Ministry Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China;3. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;4. Key Laboratory of Pressure Systems and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China |
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| Abstract: | To investigate the effect of Sm3O3 addition on the thermophysical performances of Gd3TaO7, (Gd1−xSmx)3TaO7 oxides were synthesised using sol-gel and sintering with high-temperature technologies, and their thermophysical properties were researched. The investigations exhibit that the obtained powders comprise well-distributed particles, and the bulk specimens have densified microstructures. The obtained ceramics have single pyrochlore-lattice. Owing to varied scattering strength coefficient of phonon caused by the differences in ionic radius and mass between the substituting and substituted elements, the value of thermal conductivity of (Gd1−xSmx)3TaO7 decreases firstly and further increases with the increase fraction of Sm2O3. The coefficient of thermal expansion of (Gd1−xSmx)3TaO7 is ameliorated owing to the higher ionic radius of Sm3+ than Gd3+. Except for Sm3TaO7, the synthesised ceramics display outstanding lattice steadiness up to 1400 °C. |
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| Keywords: | Thermal barrier coatings Rare-earth tantalate oxides Thermophysical performances Lattice steadiness |
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