(Sm_(0.5)Gd_(0.2)Nd_(0.3))_(2)(Hf_(0.3)Ce_(0.7))_(2)O_(7)复合氧化物的热物理性能  

Thermophysical Performances of(Sm_(0.5)Gd_(0.2)Nd_(0.3))_(2)(Hf_(0.3)Ce_(0.7))_(2)O_(7) Composite Oxides

作　　者：冉书明[1] 郭怡 RAN Shuming;GUO Yi(School of Intelligent Manufacturing,Chongqing Water Resources and Electrical Engineering College,Chongqing 402160,China)

机构地区：[1]重庆水利电力职业技术学院,智能制造学院,重庆402160

出　　处：《人工晶体学报》2021年第5期933-937,共5页Journal of Synthetic Crystals

基　　金：重庆市教科委科学技术研究项目(KJZD-K201903801)。

摘　　要：为寻求新型热障涂层用陶瓷材料,本文采用高温固相烧结法制备了(Sm_(0.5) Gd_(0.2) Nd_(0.3))_(2)(Hf_(0.3) Ce_(0.7))_(2)O_(7)复合氧化物。利用XRD分析了其晶体结构,SEM分析其显微组织,膨胀仪测试其热膨胀性能,激光热导仪测试其热扩散系数。结果表明,成功制备了具有单一萤石晶体结构的(Sm_(0.5) Gd_(0.2) Nd_(0.3))_(2)(Hf_(0.3) Ce_(0.7))_(2)O_(7)复合氧化物。其显微组织结构致密,晶界清晰无其他相存在。由于复杂的元素组成和较大的原子量,其热导率明显低于7YSZ和Sm_(2) Ce_(2)O_(7)。其较低的热膨胀系数则归因于B位离子较小的离子半径,但其热膨胀系数依然满足热障涂层的要求。In order to develop novel ceramic material for thermal barrier coatings,the(Sm_(0.5) Gd_(0.2) Nd_(0.3))_(2)(Hf_(0.3) Ce_(0.7))_(2)O_(7) composite oxides were synthesized by high temperature sintering method in this paper.Its lattice-type was analyzed by XRD,the microstructure was analyzed by SEM,thermal expansion property was tested by thermal expansion instrument,and thermal diffusivity was measured by laser thermal laser conductor-meter.Results show that the pure(Sm_(0.5) Gd_(0.2) Nd_(0.3))_(2)(Hf_(0.3) Ce_(0.7))_(2)O_(7) with single fluorite lattice was synthesized.The microstructure is very dense,and interfaces between boundaries are very clean,no other phases can be found.Owing to the complex element constituent and high atomic weight,its thermal conductivity is lower than those of 7YSZ and Sm_(2) Ce_(2)O_(7).The relative low thermal expansion coefficient of(Sm_(0.5) Gd_(0.2) Nd_(0.3))_(2)(Hf_(0.3) Ce_(0.7))_(2)O_(7) can be contributed to the lower ionic radius of cations at B sites,while the thermal expansion coefficient meets to the requirement for thermal barrier coatings.

关 键 词：稀土铈酸盐 高温固相烧结法 热障涂层 热导率 热膨胀系数 

分 类 号：V263[航空宇航科学与技术—航空宇航制造工程] TQ174.1[化学工程—陶瓷工业]