Furnace Cyclic Behavior of Plasma-Sprayed Zirconia-Yttria and Multi-Component Rare Earth Oxide Doped Thermal Barrier Coatings
Furnace Cyclic Behavior of Plasma-Sprayed Zirconia-Yttria and Multi-Component Rare Earth Oxide Doped Thermal Barrier Coatings
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DOI：
10.1002/9780470294758.ch59
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发表时间：
2002-06
期刊：
影响因子：
--
通讯作者：
Dongming Zhu;J. Nesbitt;T. Mccue;C. Barrett;Robert Miller
中科院分区：
文献类型：
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作者：
Dongming Zhu;J. Nesbitt;T. Mccue;C. Barrett;Robert Miller
陶瓷热障涂层将在先进的燃气轮机发动机中发挥越来越重要的作用，因为它们能够进一步提高发动机的温度。然而，在日益苛刻的热循环条件下，涂层的性能和耐久性成为人们关注的主要问题。先进的氧化锆基和氢氧化铝基团簇氧化物热障涂层--具有更低的导热系数和更好的热稳定性--正在使用基于高热通量激光试验台的测试方法进行开发。虽然新组成的涂层尚未针对循环耐久性进行优化，但使用常规的炉膛循环试验对众多候选涂层材料进行了初步耐久性筛选。研究了多组分稀土氧化物共掺杂的先进等离子喷涂氧化锆基热障涂层在1163℃、45min热循环下的炉膛热循环行为。采用扫描电子显微镜和X射线衍射物相分析相结合的方法，对陶瓷涂层的失效机理进行了研究。将讨论涂层的循环寿命与涂层相结构、总掺杂浓度和其他性质的关系。
Ceramic thermal barrier coatings will play an increasingly important role in advanced gas turbine engines because of their ability to enable further increases in engine temperatures. However, the coating performance and durability become a major concern under the increasingly harsh thermal cycling conditions. Advanced zirconia- and hafnia-based cluster oxide thermal barrier coatings - having lower thermal conductivity and improved thermal stability - are being developed using a high-heat-flux laser-rig based test approach. Although the new composition coatings were not yet optimized for cyclic durability, an initial durability screening of numerous candidate coating materials was carried out using conventional furnace cyclic tests. In this paper, furnace thermal cyclic behavior of the advanced plasma-sprayed zirconia-yttria-based thermal barrier coatings that were co-doped with multi-component rare earth oxides was investigated at 1163°C using 45 min hot cycles. The ceramic coating failure mechanisms were studied by using scanning electron microscopy combined with X-ray diffraction phase analysis after the furnace tests. The coating cyclic lifetime will be discussed in relation to coating phase structures, total dopant concentrations and other properties.