Rare‐Earth Zirconate Ceramics with Fluorite Structure for Thermal Barrier Coatings
Rare‐Earth Zirconate Ceramics with Fluorite Structure for Thermal Barrier Coatings
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DOI：
10.1111/j.1551-2916.2005.00667.x
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发表时间：
2006
影响因子：
3.9
通讯作者：
Qiang-Yan Xu;W. Pan;Jingdong Wang;C. Wan;L. Qi;H. Miao;Mori Kazutaka;T. Torigoe
中科院分区：
文献类型：
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作者：
Qiang-Yan Xu;W. Pan;Jingdong Wang;C. Wan;L. Qi;H. Miao;Mori Kazutaka;T. Torigoe
以氧化锆和稀土氧化物粉末为原料，在空气中于1600℃下常压烧结10 h，制备了一系列具有萤石结构的稀土锆酸Ln2Zr2O7陶瓷（Ln=Dy、Er和Yb）（F-Ln2Zr2O7）。通过X射线衍射（XRD）和扫描电子显微镜（SEM）进行微观结构实验。分别使用稳态激光热通量技术和高温膨胀测定法评估了这些陶瓷的导热性和热膨胀性。 XRD和SEM结果表明合成了具有单一萤石相的Ln2Zr2O7陶瓷，没有发现其他相。导热系数结果表明，它们的导热系数（1.3~1.9 W/(m·K)，20°~800°C）与参考的烧绿石结构Ln2Zr2O7陶瓷（Ln=La、Nd、Sm和Gd）（P-Ln2Zr2O7）一样低。结论是，具有萤石结构的稀土锆酸盐陶瓷可以被认为是未来热障涂层的候选材料。
A series of rare-earth zirconate Ln2Zr2O7 ceramics (Ln=Dy, Er, and Yb) with a fluorite structure (F-Ln2Zr2O7) were prepared by pressureless sintering from zirconia and rare-earth oxide powders at 1600°C for 10 h in air. The microstructure experiments were performed by X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The thermal conductivity and thermal expansion of these ceramics were evaluated using a steady-state laser heat-flux technique and high-temperature dilatometry, respectively. The XRD and SEM results demonstrate that Ln2Zr2O7 ceramics with a single fluorite phase are synthesized and no other phases are found. The results of thermal conductivity show that their thermal conductivities (1.3–1.9 W/(m·K), 20°–800°C) are as low as those of the referenced Ln2Zr2O7 ceramics (Ln=La, Nd, Sm, and Gd) with pyrochlore structure (P-Ln2Zr2O7). It is concluded that rare-earth zirconate ceramics with a fluorite structure can be considered as candidate materials for future thermal barrier coatings.