Dy掺杂对Sm_2Ce_2O_7热物理性能的影响  

Influence of Dy-doping on thermophyscial properties of Sm_2Ce_2O_7

作　　者：汤安[1] 赵永涛[1] 

机构地区：[1]河南工程学院机械工程学院,郑州451191

出　　处：《功能材料》2017年第6期6129-6133,共5页Journal of Functional Materials

摘　　要：以Dy_2O_3、Sm_2O_3和CeO_2为原材料,采用固相反应法制备了(Sm_(1-x)Dy_x)_2Ce_2O_7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(Sm_(1-x)Dy_x)_2Ce_2O_7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Dy^(3+)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（Sm_（1-x）Dy_x）_2Ce_2O_7 solid solutions were prepared by solid reaction method using Dy_2O_3,Sm_2O_3 and CeO_2 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（Sm_（1-x）Dy_x）_2Ce_2O_7 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 Dy^（3＋） ions,while its thermophyscial properties match well with the basic requirement for thermal barrier coatings.The synthesized（Sm_（1-x）Dy_x）_2Ce_2O_7 solid solutions have potentials to be explored as candidates for thermal barrier coatings.

关 键 词：稀土铈酸盐 热障涂层 热导率 热膨胀系数 

分 类 号：TB34[一般工业技术—材料科学与工程]