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Title: Preparation and thermophysical properties of (Sm{sub 1−x}Er{sub x}){sub 2}Ce{sub 2}O{sub 7} oxides for thermal barrier coatings

Graphical abstract: - Highlights: • These ceramic materials with fluorite structure were synthesized. • Defect points lead to their lower thermal conductivities. • The lower ionic radius of Er{sup 3+} ion leads to the reduction of thermal expansion coefficient of (Sm{sub 1−x}Er{sub x}){sub 2}Ce{sub 2}O{sub 7} oxides. - Abstract: (Sm{sub 1−x}Er{sub x}){sub 2}Ce{sub 2}O{sub 7} ceramics were synthesized by sol–gel method and sintered at 1600 °C for 10 h in air. The influence of Er{sub 2}O{sub 3}-substitution on the phase structure and thermophysical properties of Sm{sub 2}Ce{sub 2}O{sub 7} was investigated. The phase structures of these ceramics were identified by X-ray diffraction showing that all synthesized ceramics have fluorite-type structure. The measurements for thermophysical properties of these ceramics show that their thermal conductivities and thermal expansion coefficients remarkably decreased through Er-substitution. However, the thermal expansion coefficients were higher than that of YSZ and their thermal conductivities were much lower than that of 8YSZ. The excellent thermophysical property implies that these solid solutions are potential materials for the ceramics layer in thermal barrier coatings.
Authors:
 [1] ;  [2] ;  [3] ; ; ; ; ; ;  [3]
  1. Department of Construction Engineering, Henan Institute of Engineering, Zhengzhou 450007 (China)
  2. Department of base of Railway and Public Security, Railway Police College, Zhengzhou 450000 (China)
  3. Department of Mechanical Engineering, Henan Institute of Engineering, Zhengzhou 450007 (China)
Publication Date:
OSTI Identifier:
22348594
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 51; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERAMICS; ERBIUM IONS; ERBIUM OXIDES; FLUORITE; SOL-GEL PROCESS; SOLID SOLUTIONS; THERMAL CONDUCTIVITY; THERMAL EXPANSION; X-RAY DIFFRACTION; YTTRIUM OXIDES; ZIRCONIUM OXIDES