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等离子喷涂-激光熔覆CoCrTaAlY/YSZ热障涂层的抗高温氧化机理及热震性能

High-Temperature Oxidation Resistance Mechanism and Thermal Shock Performance of CoCrTaAlY/YSZ Thermal Barrier Coatings Fabricated Using Plasma Spraying and Laser Cladding

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摘要

采用半导体激光熔覆技术与等离子喷涂相结合的方法,在1Cr13不锈钢基体表面制备了CoCrTaAlY/YSZ热障涂层,然后采用扫描电子显微镜(SEM)、能谱仪(EDS)及X射线衍射仪(XRD)分别对涂层的微观组织、成分分布及物相进行表征。结果表明:YSZ涂层的物相主要由ZrO2的立方晶相(c-ZrO2)、正方晶相(t-ZrO2)及少量单斜相(m-ZrO2)组成;黏结层具有典型的快速熔凝组织特征,与基体实现了冶金结合。对涂层的抗高温氧化机理、热震性能及其失效行为进行研究后发现:Al2O3氧化膜的形成能阻止O元素扩散,使涂层的抗高温氧化性能约为基体的4.1倍(YSZ涂层氧化累积增重仅为0.08 g·cm -2);YSZ涂层在900 ℃下热震20次后开始出现裂纹,且裂纹随热震次数增加逐渐变大,热震30次时试样完全断裂。

Abstract

CoCrTaAlY/YSZ thermal barrier coatings (TBCs) are fabricated by diode laser cladding and plasma spraying on a 1Cr13 steel substrate. The morphologies of coatings are observed by the scanning electronic microscopy, the composition distribution is analyzed through energy dispersive spectroscopy, and the phase composition is characterized by X-ray diffractometer. The results demonstrate that the phase composition of a YSZ coating comprises cubic ZrO2 (c-ZrO2), tetragonal ZrO2 (t-ZrO2), and a small amount of monoclinic ZrO2 (m-ZrO2). The bonding layer has typical rapid melting microstructure characteristics and metallurgical bonds with the substrate. The thermal shock performance and high-temperature oxidation resistance mechanism of TBCs as well as their failure behavior are investigated. The results show that the formation of Al2O3 oxide film can prevent the diffusion of oxygen. Consequently, the high-temperature oxidation resistance of TBCs is about 4.1 times that of the substrate (the cumulative oxidation weight gain of the YSZ coating is only 0.08 g·cm -2). The YSZ coating appears to crack for the first time after it undergoes 20 thermal shocks at 900 ℃. The cracks gradually become larger as the number of thermal shocks increases, and the coating breaks completely after 30 thermal shocks.

补充资料

中图分类号:TG174, 文献标识码 A, doi:

DOI:

所属栏目:激光制造

基金项目:国家自然科学基金; 天津市高等教育机构科学与发展基金; 天津市优秀青年学者人才培养专项计划;

收稿日期:2018-12-13

修改稿日期:2019-03-13

网络出版日期:2019-08-01

作者单位    点击查看

顾振杰:天津工业大学激光技术研究所, 天津 300387
雷剑波:天津工业大学激光技术研究所, 天津 300387
窦俊雅:天津工业大学激光技术研究所, 天津 300387
郭津博:天津工业大学激光技术研究所, 天津 300387

联系人作者:顾振杰(ljbtj@163.com); 雷剑波(ljbtj@163.com);

备注:国家自然科学基金; 天津市高等教育机构科学与发展基金; 天津市优秀青年学者人才培养专项计划;

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引用该论文

Gu Zhenjie,Lei Jianbo,Dou Junya,Guo Jinbo. High-Temperature Oxidation Resistance Mechanism and Thermal Shock Performance of CoCrTaAlY/YSZ Thermal Barrier Coatings Fabricated Using Plasma Spraying and Laser Cladding[J]. Chinese Journal of Lasers, 2019, 46(8): 0802007

顾振杰,雷剑波,窦俊雅,郭津博。 等离子喷涂-激光熔覆CoCrTaAlY/YSZ热障涂层的抗高温氧化机理及热震性能[J]。 中国激光, 2019, 46(8): 0802007

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