Effect of post heat treatment on thermal durability of thermal barrier coatings in thermal fatigue tests
Effect of post heat treatment on thermal durability of thermal barrier coatings in thermal fatigue tests
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DOI：
10.1016/j.surfcoat.2012.08.078
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发表时间：
2013-01
影响因子：
5.4
通讯作者：
S. Myoung;S. Lee;Hyun-Seong Kim;Min-Sik Kim;Yeon‐Gil Jung;Sung-Il Jung;T. Woo;U. Paik
中科院分区：
文献类型：
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作者：
S. Myoung;S. Lee;Hyun-Seong Kim;Min-Sik Kim;Yeon‐Gil Jung;Sung-Il Jung;T. Woo;U. Paik
研究了后处理工艺和涂层参数对热障涂层组织演变的影响，并通过循环热暴露试验评价了与组织演变相关的耐热性。采用9MB喷枪，用9MB喷枪制备了厚度分别为2 0 0 0和2 0 0μm的热障涂层，顶层为ZrO2-8wt.%Y2 03C-NS，粘结层为镍基金属粉末AMDRY962。后加热温度为1000℃，升温速率为5℃/min，气体流量为200ml/min。热暴露试验采用了专门设计的热暴露试验装置，保持时间为60min，循环次数为874次-样品一侧暴露在1100℃的高温下，另一侧空冷至950℃。后热处理是提高厚热障涂层耐热性的有效工艺，通过控制涂层参数获得的多孔微结构热障涂层显示出比中等或致密组织的热障涂层更好的耐热性能。结果表明，后热处理和组织控制是提高厚壁热障涂层在高温环境下使用寿命的有效工艺的关键。
The effects of post heat treatment and coating parameters on the microstructural development of thermal barrier coatings (TBCs) have been investigated and the thermal durability related to the microstructural evolution has been evaluated through cyclic thermal exposure tests. TBC systems with thicknesses of 2000 and 200μm in the top and bond coats, respectively, were prepared with the air–plasma spray system using a 9MB gun with ZrO2–8wt.% Y2O3(METCO 204 C-NS) for the top coat and Ni-based metallic powder (AMDRY 962) for the bond coat. The post heating was performed at a temperature of 1000°C for 3h with a heating rate of 5°C/min in flowing argon (Ar) gas at 200ml/min. The thermal exposure tests were performed with a dwell time of 60min for 874cycles using a specially designed apparatus—one side of the sample was exposed to a high temperature of 1100°C and the other side was air cooled to 950°C. The post heat treatment is an efficient process in improving the thermal durability of thick TBCs, and the TBC with porous microstructure obtained by controlling coating parameters shows a better thermal durability than those with intermediate or dense microstructures. Results indicate that post heat treatment and microstructural control are important in proposing efficient processes to improve the lifetime performance of thick TBCs in high-temperature environments.