| EB—PVD梯度热除涂层的热循环失效机制 |
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| 引用本文： | 郭洪波,徐惠彬,宫声凯,刘福顺. EB—PVD梯度热除涂层的热循环失效机制[J]. 金属学报, 2001, 37(2): 151-155 |
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| 作者姓名： | 郭洪波 徐惠彬 宫声凯 刘福顺 |
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| 作者单位： | 北京航空航天大学材料科学与工程系,北京,100083 |
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| 基金项目： | 国家自然科学基金 59772028，航空基金97H51060 |
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| 摘 要： | 了一种新型梯度结构的EB－PVD（电子束物理气相沉积）热障涂层的热循环性能，并分析了涂层的失效机制，结果表明，由于NiCoCrAlY粘结层以及在粘结层上形成的Ni3Al薄层发生了选择性氧化，从而在粘结层和梯度过渡层之间形成了一层Al2O3层，随着热循环时间增长，Al2O3层不断增厚，而且在热循环应力作用下，涂层最终沿Al2O3层内部断裂失效。
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| 关 键 词： | EB－PVD 梯度热障涂层 热循环 过渡层 失效机制 |
| 文章编号： | 0412-1961(2001)02-0151-05 |
| 修稿时间： | 2000-07-27 |
FAILURE MECHANISM OF GRADIENT THERMAL BARRIER COATING SUBJECTED TO THERMAL CYCLING |
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| GUO Hongbo,XU Huibin,GONG Shengkai,LIU Tushun. FAILURE MECHANISM OF GRADIENT THERMAL BARRIER COATING SUBJECTED TO THERMAL CYCLING[J]. Acta Metallurgica Sinica, 2001, 37(2): 151-155 |
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| Authors: | GUO Hongbo XU Huibin GONG Shengkai LIU Tushun |
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| Affiliation: | GUO Hongbo,XU Huibin,GONG Shengkai,LIU Tushun Department of Materials Science and Engineering,Beijing University of Aeronautics and Astronauts,Beijing 100083 |
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| Abstract: | Thermal cycling behavior of a new type gradient thermal barrier coating produced by electron beam physical vapor deposition (EB-PVD) was studied and its failure mechanism also analyzed. It is found that an a-Al2O3 scale was formed between NiCoCrAlY bond coat and gradient transition layer in the coating, which results from the selective oxidation of the NiCoCrAlY bond coat and Ni3Al thin film on the surface of the bond coat. As the thermal cycling test went on, the thickness of the Al2O3 scale increased and under the action of thermal stress in the oxide scale, failure of the gradient coating eventually took place by cracking within the Al2O3 scale. |
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| Keywords: | electron beam physical vapor deposition (EB-PVD) gradient thermal barrier coating thermal cycling transition layer |
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