Preparation and thermophysical properties of (Sm_{1鈭?span style='font-style: italic'>x}Er_x)₂Ce₂O₇ oxides for thermal barrier coatings

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• 作者：Chen Xiaoge ; Yang Shusen ; Zhang Hongsong ; Li Gang ; Li. Zhenjun ; Ren Bo ; Dang Xudan ; Zhang Haoming ; Tang An
• 关键词：Oxides ; Specific heat ; Thermal conductivity ; Thermal expansion
• 刊名：Materials Research Bulletin
• 出版年：March, 2014
• 年：2014
• 卷：51
• 期：Complete
• 页码：171-175
• 全文大小：1052 K

文摘

(Sm_1鈭?em>xEr_x)₂Ce₂O₇ ceramics were synthesized by sol-gel method and sintered at 1600 掳C for 10 h in air. The influence of Er₂O₃-substitution on the phase structure and thermophysical properties of Sm₂Ce₂O₇ 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.