纳米ZrO2－Y2O3－La2O3热障涂层的结构与性能研究
Study on Microstructure and Properties of Nano-structured ZrO2-Y2O3-La2O3 Thermal Barrier Coating
章桥新, 黄 祺, 揭 松, 李 涛
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作者单位：武汉理工大学 材料学院, 湖北 武汉 430070
中文关键字：纳米粉末； 等离子喷涂； 热障涂层； 热导率； 结合强度
英文关键字：
中文摘要：采用喷雾造粒工艺在纳米ZrO2-8wt%Y2O3(8YSZ)基体中添加了纳米La2O3，并进行团聚、热处理，作为喷涂喂料。NiCrAlY(Ni-25Cr-5Al-0.5Y，wt%)作为粘结层材料，采用等离子喷涂技术制备热障涂层。对涂层的组织结构和性能进行了表征与分析。结果表明：喷涂后涂层相组成只有稳定的t相；涂层具有典型的等离子喷涂结构；添加纳米La2O3能够降低涂层的热导率，且涂层的结合强度随掺杂量的增多而提高。
英文摘要：The powder of nano-ZrO2-8wt%Y2O3 (nano-8YSZ) and doped with different content nanoscale La2O3 in the nano-8YSZ was agglomerated by spray drying process and then its heat treatment was carried out. The NiCrAlY (Ni-25Cr-5Al-0.5Y, wt%) alloy was used as the bonding coating. Thermal barrier coating of different kinds of materials was prepared by atmospheric plasma spray (APS) coating technology. The phase composition, microstructure and properties of the coating were analyzed. The results show that only stable t-phase exists in the coating and the typical microstructure of plasma-sprayed coatings are observed in the coating. The coating doped with nano-La2O3 can reduce the thermal conductivity and the adhesion strength increases with the increase of the content of La2O3.