Thermal Barrier Coatings for the 21st Century
Thermal Barrier Coatings for the 21st Century
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DOI：
10.1515/ijmr-1999-901218
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发表时间：
1999-12
影响因子：
0.8
通讯作者：
M. Stiger;M. M. Yanar-M.;M. Topping;F. Pettit;G. H. Meier
中科院分区：
文献类型：
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作者：
M. Stiger;M. M. Yanar-M.;M. Topping;F. Pettit;G. H. Meier
通过电子束物理气相沉积（EBPVD）制备的氧化钇稳定的氧化锆（YSZ）热障涂层（TBCs）为翼型应用提供了一些独特的性能。这种涂层通常沉积在高温合金基底上的扩散铝化物或MCrAlY粘结涂层上。在YSZ TBC沉积于粘结层上的过程中，在TBC与粘结层之间形成了主要由α-Al 2 O3组成的热生长氧化物（TGO）。这些TBC在氧化环境中的寿命由储存的弹性能驱动spectrum与TGO/粘结涂层界面的界面韧性的相互作用决定，因为TBC系统的失效经常发生在该界面处。EBPVD-TBCs在处理和暴露条件下的微观结构已经使用各种技术来确定和描述失效机制。结果表明，TBC的失效机制取决于粘结层的制造过程和暴露环境。最后，概述了改进TBC系统的可能方案。
Yttria stabilized zirconia (YSZ) thermal barrier coatings (TBCs) fabricated via electron beam physical vapor deposition (EBPVD) provide some unique properties for aerofoil applications. Such coatings are usually deposited on diffusion aluminide or MCrAIY bond coats on superalloy substrates. During deposition of the YSZ-TBC on the bond coat, a thermally grown oxide (TGO) consisting primarily of α-Al 2 O 3 is formed between the TBC and bond coat. The lives of these TBCs in oxidizing environments is determined by the interplay of the stored elastic energy driving spallation versus the interfacial toughness of the TGO/bond coat interface since failure of the TBC system often occurs at this interface. The microstructures of EBPVD-TBCs in the as-processed and exposed conditions have been documented using a variety of techniques to determine and describe the failure mechanisms. It is shown that the failure mechanisms for TBC's are dependent on the bond coat fabrication procedure and the exposure environment. Finally, possible schemes for improving TBC systems are outlined.