Failure Analysis of Multilayered Suspension Plasma-Sprayed Thermal Barrier Coatings for Gas Turbine Applications
Failure Analysis of Multilayered Suspension Plasma-Sprayed Thermal Barrier Coatings for Gas Turbine Applications
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DOI：
10.1007/s11666-017-0683-x
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发表时间：
2018-01
影响因子：
3.1
通讯作者：
M. Gupta;N. Markocsan;R. Rocchio-Heller;J. Liu;X. Li;L. Östergren
中科院分区：
文献类型：
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作者：
M. Gupta;N. Markocsan;R. Rocchio-Heller;J. Liu;X. Li;L. Östergren
提高热障涂层（tbc）的性能是燃气轮机应用进一步发展的关键目标之一。作为TBC面漆最常用的材料是氧化钇稳定氧化锆（YSZ）。然而，YSZ的使用受到工作温度范围的限制，这反过来又限制了发动机的效率。焦绿石、钙钛矿、稀土石榴石等材料在高温下表现出较低的热导率和较高的相稳定性，是取代YSZ的合适候选材料。研究了用悬浮等离子喷涂（SPS）法制备的由先进面漆材料组成的多层tbc。所研究的面漆材料有YSZ、dysprosia-稳定氧化锆、锆酸钆和ceria - ytria -稳定氧化锆。所有面漆均采用TriplexPro-210TMplasma喷枪和径向注射悬浮液进行沉积。通过热循环疲劳试验和热冲击试验，考察了试样的寿命。用扫描电镜对喷涂后和失效试样进行微观组织分析。本文讨论了每种情况下的失效机制。结果表明，SPS是一种很有前途的高温多层tbc制备方法。
Improvement in the performance of thermal barrier coatings (TBCs) is one of the key objectives for further development of gas turbine applications. The material most commonly used as TBC topcoat is yttria-stabilized zirconia (YSZ). However, the usage of YSZ is limited by the operating temperature range which in turn restricts the engine efficiency. Materials such as pyrochlores, perovskites, rare earth garnets are suitable candidates which could replace YSZ as they exhibit lower thermal conductivity and higher phase stability at elevated temperatures. The objective of this work was to investigate different multilayered TBCs consisting of advanced topcoat materials fabricated by suspension plasma spraying (SPS). The investigated topcoat materials were YSZ, dysprosia-stabilized zirconia, gadolinium zirconate, and ceria–yttria-stabilized zirconia. All topcoats were deposited by TriplexPro-210TMplasma spray gun and radial injection of suspension. Lifetime of these samples was examined by thermal cyclic fatigue and thermal shock testing. Microstructure analysis of as-sprayed and failed specimens was performed with scanning electron microscope. The failure mechanisms in each case have been discussed in this article. The results show that SPS could be a promising route to produce multilayered TBCs for high-temperature applications.