(Sm0.5Gd0.3Yb0.2)2Ce2O7的热导率与热膨胀系数

被引：0
|
作者：
吕建国 [1 ]
张昊明 [2 ]
张红松 [2 ]
机构：
[1] 昆明理工大学城市学院
[2] 河南工程学院机械工程学院
来源：
陶瓷学报 | 2017年 / 38卷 / 01期
关键词：
热障涂层; 稀土铈酸盐; 热导率; 热膨胀系数;
D O I：
10.13957/j.cnki.tcxb.2017.01.006
中图分类号：
TQ174.1 [基础理论];
学科分类号：
摘要：
以Sm2O3、Gd2O3、Yb2O3和硝酸铈为原料,采用溶胶凝胶法和固相反应法制备了(Sm0.5Gd0.3Yb0.2)2Ce2O7陶瓷,用X射线衍射法分析了其相组成.用扫描电镜观察了其显微形貌.用激光脉冲法和推杆法测试了其热扩散系数及热膨胀系数。结果表明.合成的纯净的具有萤石结构的(Sm0.5Gd0.3Yb0.2Ce2O7陶瓷.其显微组织致密.晶界清晰干净。掺杂原子与基质原子之间质量及离子半径的差别增加了声子散射程度.从而使其热导率显著降低。同时因Gd3+、Yb3+引入而导致的氧空位有序度下降使得(Sm0.5Gd0.3Yb0.2Ce2O7具有较低的热膨胀系数.但仍满足热障涂层的要求.所合成的(Sm0.5Gd0.3Yb0.2)2Ce2O7陶瓷可用作新型热障涂层材料。
引用
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页码：31 / 34
页数：4
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