| 热障涂层热循环过程中的界面扩散系数 |
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| 引用本文： | 邹金龙,周益春,刘兴军. 热障涂层热循环过程中的界面扩散系数[J]. 湘潭大学自然科学学报, 2004, 26(2): 41-47 |
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| 作者姓名： | 邹金龙 周益春 刘兴军 |
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| 作者单位： | 1. 湘潭大学材料与光电物理学院,湖南,湘潭,411105
2. 日本东北大学材料系,980-8579,仙台市,日本 |
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| 基金项目： | 湖南省中青年基金资助项目 (0 1JJY2 10 1) |
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| 摘 要： | 采用磁控溅射力方法在镍基单晶高温合金基体上沉积Ni-30Cr-12Al-0．3Y(质量分数，％)粘结层，采用电束物理气相沉积方法(EB-PVD)沉积7％Y2O3(质量分数，％ZrO2)陶瓷层．对粘结层与陶瓷层界面在1050℃循环100次时的元素扩散，提出了电子探针与最小二乘法相结合的研究方法．求出元素在界面的扩散系数．继续热循环，粘结层中Al贫化．Ni和Cr参与氧化，加速氧化反应，增加氧化膜内应力，使氧化膜破裂、陶瓷层剥落，最终导致热障涂层失效。
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| 关 键 词： | 热障涂层 热循环 扩散系数 电子探针 最小三乘法 |
| 文章编号： | 1000-5900(2004)02-0041-07 |
| 修稿时间： | 2003-09-01 |
Interfacial Diffusion Coefficients of EB-PVD Thermal Barrier Coatings During Thermal Cycling |
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| ZOU Jinlong,ZHOU Yichun,LIU Xinjun. Interfacial Diffusion Coefficients of EB-PVD Thermal Barrier Coatings During Thermal Cycling[J]. Natural Science Journal of Xiangtan University, 2004, 26(2): 41-47 |
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| Authors: | ZOU Jinlong ZHOU Yichun LIU Xinjun |
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| Affiliation: | ZOU Jinlong~1,ZHOU Yichun~1,LIU Xinjun~2 |
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| Abstract: | Depositing Ni-30Cr-12Al-0.3Y (Mass fraction,%)bond coat on a Ni-base single crystal super-alloy by magnetron sputtering,a ceramic top coat (7%Y_(2)O_(3)-ZrO_(2)) was deposited by electronbeam-physical vapor deposition (EB-PVD). The interfacial diffusion of alloy elements between coating and substrate has been studied by electron-probe microanalysis and least square method. With increasing thermal cycles, Al was depleted,and Ni, Cr wouldbe be oxidized near the interface between thermal growth oxidation(TGO)and bond coat. Stress concentration due to the existence of thermal growth oxidation would weaken the combination between top ceramic coat and bond coat, and consequently, the stresses would result in the spallation of thermal barrier ceramic coating. |
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| Keywords: | thermal barrier coating thermal cycles diffusion coefficient electron miroprohe least square method |
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