摘要
以Sm_2O_3、Gd_2O_3、CeO_2和ZrO_2为原料,采用固相反应法制备了(Sm_(0.5)Gd_(0.5))_2(Ce_(0.7)Zr_(0.3))_2O_7陶瓷,采用X射线衍射法、扫描电子显微镜分析了其相结构及显微组织,采用激光脉冲法和推杆膨胀法测试了其热扩散及热膨胀性能。结果表明,本文成功合成了具有萤石结构的(Sm_(0.5)Gd_(0.5))_2(Ce_(0.7)Zr_(0.3))_2O_7陶瓷,其组织致密,且晶界清晰;小半径离子掺杂使其热膨胀系数小于Sm_2Ce_2O_7,但仍然满足热障涂层的要求;掺杂原子与基质原子之间质量及离子半径之间的差别使其具有较低的热导率。(Sm_(0.5)Gd_(0.5))_2(Ce_(0.7)Zr_(0.3))_2O_7有潜力用作新型热障涂层用陶瓷材料。
Using Sm_2O_3, Gd_2O_3, CeO_2 and ZrO_2 as raw materials,（Sm_（0.5）Gd_（0.5））_2（Ce_（0.7）Zr_（0.3））_2O_7 ceramic was prepared by solid reaction method. Its phase structure and microstructure were analyzed by X-ray diffraction and scanning electronic microscope, its thermal conductivity and thermal expansion coefficient were measured by laser-flashing method and pushing-rod technology. Results show that the pure（Sm_（0.5）Gd_（0.5））_2（Ce_（0.7）Zr_（0.3））_2O_7 of fluorite structure is prepared successfully and its microstructure is very dense. The doping of low radius ions leads to its thermal expansion coefficient lower than that of Sm_2Ce_2O_7, which is satisfied the requirement of thermal barrier coating. The lower thermal conductivity compared with Sm_2Ce_2O_7 can be attributed to the differences of mass and ironic radius between doping atoms and host ions. The synthesized（Sm_（0.5）Gd_（0.5））_2（Ce_（0.7）Zr_（0.3））_2O_7 can be used as novel ceramic material for thermal barrier coatings in future.
出处
《中国陶瓷》
CAS
CSCD
北大核心
2016年第3期26-30,共5页
China Ceramics
基金
河南省高校科技创新人才资助计划项目(13HASTIT018)
河南省科技攻关计划项目(102102210460)
关键词
热障涂层
稀土铈酸盐
掺杂
热物理性能
Thermal barrier coatings
Rare earth cerium oxides
Doping
Thermophysical property
