| 电子束物理气相沉积LaZrCeO热障涂层微结构与热循环性能 |
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| 引用本文： | 牟仁德,刘冠熙,谢孝昌.电子束物理气相沉积LaZrCeO热障涂层微结构与热循环性能[J].航空材料学报,2022,12(1):33-39. |
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| 作者姓名： | 牟仁德 刘冠熙 谢孝昌 |
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| 作者单位： | 中国航发北京航空材料研究院,航空材料先进腐蚀与防护重点实验室,北京 100095;中国航发北京航空材料研究院,北京 100095,中国航发北京航空材料研究院,北京 100095 |
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| 摘 要： | 热障涂层(thermal barrier coatings,TBCs)是一种由金属黏结层、热生长氧化物层和陶瓷面层组成的金属-陶瓷复合系统,在先进的航空发动机领域上引起了广泛的关注,但目前先进热障涂层的热循环寿命提升和失效行为研究仍然是一个难点。本研究采用电子束物理气相沉积技术(electron beam physical vapour deposition,EB-PVD)制备LaZrCeO/YSZ双陶瓷层热障涂层,研究热障涂层的相结构、显微组织和失效行为。结果表明:LaZrCeO/YSZ涂层为烧绿石与萤石结构组成的复合涂层材料,LaZrCeO/YSZ涂层的微观结构由羽毛状纳米结构和柱内孔隙组成;在1100℃热循环条件下,LaZrCeO/YSZ双陶瓷层热障涂层展现了良好的热循环寿命;热循环实验后,由于应力累积的作用裂纹在热生长氧化层(TGO)中萌生并扩展,包括水平裂纹和垂直裂纹两大类,进而引起整个涂层体系的不稳定,最终导致涂层失效。
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| 关 键 词： | 热障涂层 电子束物理气相沉积 微结构 热循环性能 |
Microstructure and thermal cycling life of LaZrCeO thermal barrier coatings deposited by electron beam physical vapor deposition |
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| MU Rende,LIU Guanxi,XIE Xiaochang.Microstructure and thermal cycling life of LaZrCeO thermal barrier coatings deposited by electron beam physical vapor deposition[J].Journal of Aeronautical Materials,2022,12(1):33-39. |
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| Authors: | MU Rende LIU Guanxi XIE Xiaochang |
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| Institution: | (Key Laboratory for Advanced Corrosion and Protection of Aviation Materials,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China) |
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| Abstract: | Advanced thermal barrier coatings(TBCs)have attracted extensive attention in the field of advanced aero-engine.The thermal cycling life and failure behavior of advanced TBCs still remain a challenge.This work focuses on crystal structure,microstructure and failure behavior of the LaZrCeO/YSZ double ceramic layers TBCs.A composite of pyrochlore and fluorite is formed in LaZrCeO/YSZ coating.The microstructure of LaZrCeO/YSZ coating is composed of feathery nanostructure and intra-columnar pores.The LaZrCeO/YSZ DCL TBCs exhibit good thermal cycling life at 1100°C.After thermal cycling test,the cracks initiated and propagated in TGO layer due to the stress concentration,including horizontal cracks and vertical cracks,led to the instability of the whole coating system,and finally caused the failure of TBCs. |
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| Keywords: | thermal barrier coatings electron beam physical vapour deposition microstructure thermal cycling life |
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