以Dy2O3、Sm2O3和CeO2 为原材料,采用固相反应法制备了(Sm1-xDyx)2Ce2O7固溶体.采用XRD技术分析了其相结构,用扫描电子显微镜观察了其显微组织,用激光脉冲法和推杆膨胀法测试了其热扩散系数和热膨胀系数.结果表明,成功制备了具有单一萤石结构的(Sm1-xDyx)2Ce2O7固溶体,该系列固溶体显微组织致密,晶界清晰.其热导率和热膨胀系数均随着Dy3+掺杂量的增加而降低,但均满足热障涂层的要求.该系列固溶体有潜力用作新型热障涂层表面陶瓷层材料.
In this paper, the (Sm1-xDyx)2Ce2O7 solid solutions were prepared by solid reaction method using Dy2O3, Sm2O3 and CeO2 as the reactants.Its phase composition was analyzed by XRD technology, the microstructure was observed by scanning electronic microscope (SEM).Its thermal diffusivity and expansion coefficient were measured by laser-flashing method and pushing-rod technology.Results show that pure (Sm1-xDyx)2Ce2O7 solid solutions were synthesized successfully, its microstructure was very dense, and the grain interface was clear.Its thermal conductivity and expansion coefficient decrease gradually with the increasing content of Dy3+ ions, while its thermophyscial properties match well with the basic requirement for thermal barrier coatings.The synthesized (Sm1-xDyx)2Ce2O7 solid solutions have potentials to be explored as candidates for thermal barrier coatings.
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