SmxCe1-xO2-x/2（x=0.05,0.1,0.15）陶瓷的热物理性能

Thermal Physical Properties of SmxCe1-xO2-x/2（x=0.05, 0.1, 0.15） Ceramics

以Sm2O3和Ce（NO3）·6H2O为原料,采用溶胶凝胶法和固相烧结法合成了SmxCe1-xO2-x/2陶瓷材料。研究了材料的相结构和显微组织,热导率和热膨胀。结果表明：合成的SmxCe1-xO2-x/2陶瓷纯净并具有单一的萤石结构。其显微组织致密,晶界清晰。Sm2O3掺杂能降低CeO2的热导率,其1000℃时的热导率在2.22.6 W/m·K之间,与氧化钇部分稳定氧化锆的热导率相当;SmxCe1-xO2-x/2陶瓷的热膨胀随Sm2O3含量的增加而降低,其1200℃时的热膨胀系数大于13×10^-6/K。

By using Sm2O3 and Ce（NO3）·6H2O as raw materials, SmxCe1-xO2-x/2 ceramics were synthesized via solgel method and solid state sintering. The phase structures, microstructure, the thermal conductivities and thermal expansions of the bulk ceramics were studied. The results show that the obtained SmxCe1-xO2-x/2 ceramics are pure and with a single fluorite structure. The microstructure of the bulk ceramics are very dense, and the particle-interfaces are very clear. The SmxCe1-xO2-x/2 ceramics have a low thermal conductivities ranging of 2.2 2.6 W/m·K at 1000 ℃, which are very close to that of the Y2O3 stabilized ZrO2 ceramics. The thermal expansion coefficients of SmxCe1-xO2-x/2 ceramics decrease with the Sm2O3 content increasing. Their thermal expansion coefficients at 1200 ℃ are greater than 13×10^-6/K.