Yu Haipeng, Chen Xiaoge, Zhang Hongsong, Zhang Haoming, Zhao Yongde, Liu Yanxu, Tang An
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引用次数: 5
摘要
摘要采用固相反应法制备了sm2alta7，并对其相组成、微观结构和热物理性能进行了研究。XRD结果表明，成功制备了具有单一焦绿石型结构的纯sm2alta7。Sm2AlTaO7在1273 K时的导热系数约为1.13 W m−1 K−1，远低于YSZ的导热系数。低导热系数可归因于取代原子引起的声子散射。其热膨胀系数低于Sm2Ce2O7，但接近YSZ。293 ~ 1673 K之间没有发生相变。优异的热物理性能意味着sm2alta7具有作为热障涂层候选陶瓷材料的潜力。
Abstract In this work, the Sm2AlTaO7 was synthesized by solid reaction method, and its phase composition, microstructure, and thermophysical properties were investigated. XRD results show that pure Sm2AlTaO7 with single pyrochlore-type structure is prepared successfully. The thermal conductivity of Sm2AlTaO7 at 1,273 K is about 1.13 W m−1 K−1, which is much lower than that of YSZ. The low thermal conductivity can be attributed to the phonon scattering caused by substituting atoms. Its thermal expansion coefficient is lower than that of Sm2Ce2O7, but close to that of YSZ. There is no phase transformation occurred between 293 and 1,673 K. The excellent thermophysical property means that the Sm2AlTaO7 has potential to be used as candidate ceramic material for thermal barrier coatings.
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