Abstract
A pure Sm2(Zr0.6Ce0.4)2O7 ceramic was prepared via solid-state reaction using ZrO2, CeO2, and Sm2O3 as the starting powders at 1600 °C for 10 h. The phase composition and microstructure were studied by X-ray diffraction (XRD), Fourier-transform infrared spectrometer (FT-IR), and scanning electron microscope (SEM). The thermal conductivity was measured by laser-flash method. The results indicated that the prepared ceramic had a pure fluorite structure. Its microstructure was dense with a relative density of 93.35% and there were no other unreacted oxides or interphases in the interfaces between grains. Because of the structure transformation from pyrochlore to fluorite, the synthesized product had a higher thermal conductivity than Sm2Zr2O7 ceramic. However, the average thermal conductivity of Sm2(Zr0.6Ce0.3)2O7 was lower than that of yttria-stabilized zirconia. The measurements of thermal conductivity suggested that the synthesized ceramic can be used as a new material for new thermal barrier coatings in the future.
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