| Transient oxidation behavior of nanocrystalline CoCrAlY coating at 1050℃ |
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| 引用本文： | 刘光明 李美栓 马敬翙 杜楠 周延春. Transient oxidation behavior of nanocrystalline CoCrAlY coating at 1050℃[J]. 中国有色金属学会会刊, 2007, 17(3): 595-599. DOI: 10.1016/S1003-6326(07)60140-X |
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| 作者姓名： | 刘光明 李美栓 马敬翙 杜楠 周延春 |
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| 作者单位： | [1]Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; [2]School of Materials Science and Engineering, Nanchang Institute of Aeronautical Technology, Nanchang 330034, China |
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| 基金项目： | Foundation item： Project（50371095） supported by the National Natural Science Foundation of China |
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| 摘 要： | Nanocrystalline CoCrA1Y overlay coating was prepared on M38G superalloy by magnetron sputtering deposition. To investigate the oxidation behavior and phase transformation of alumina during oxidation, the oxidation experiments were conducted at 1 050 ℃ for various time in the range of 5-180 min. The phase compositions of the oxide scales were investigated by using glancing angle X-ray diffraction（XRD）. The microstructure analysis of oxide scales was carried out by means of scanning electron microscopy（SEM）. The growth process of metastable alumina at the grain boundaries and transformation to stable alumina were discussed. The results show that at the initial oxidation stage the mixture of δ-Al2O3, γ-Al2O3 and α-Al2O3 is formed on the sample surface rapidly. Especially, δ-Al2O3 and γ-Al2O3 prefer growing at the grain boundaries of CoCrA1Y coating. With increasing oxidation time, δ-Al2O3 and γ-Al2O3 transform to θ-Al2O3, afterwards θ-Al2O3 transforms to α-Al2O3 gradually. After 180 min oxidation, θ-Al2O3 transforms into α-Al2O3 completely.
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| 关 键 词： | 氧化反应 相位转换 CoCrAlY合金 合金包覆 钴 铬 铝 钇 |
| 收稿时间： | 2006-10-23 |
| 修稿时间： | 2006-10-232007-02-02 |
Transient oxidation behavior of nanocrystalline CoCrAlY coating at 1 050 °C |
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| LIU Guang-ming,LI Mei-shuan,MA Jing-hui,DU Nan,ZHOU Yan-chun,. Transient oxidation behavior of nanocrystalline CoCrAlY coating at 1 050 °C[J]. Transactions of Nonferrous Metals Society of China, 2007, 17(3): 595-599. DOI: 10.1016/S1003-6326(07)60140-X |
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| Authors: | LIU Guang-ming LI Mei-shuan MA Jing-hui DU Nan ZHOU Yan-chun |
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| Affiliation: | 1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; 2. School of Materials Science and Engineering, Nanchang Institute of Aeronautical Technology, Nanchang 330034, China |
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| Abstract: | Nanocrystalline CoCrAlY overlay coating was prepared on M38G superalloy by magnetron sputtering deposition. To investigate the oxidation behavior and phase transformation of alumina during oxidation, the oxidation experiments were conducted at 1 050 °C for various time in the range of 5–180 min. The phase compositions of the oxide scales were investigated by using glancing angle X-ray diffraction(XRD). The microstructure analysis of oxide scales was carried out by means of scanning electron microscopy(SEM). The growth process of metastable alumina at the grain boundaries and transformation to stable alumina were discussed. The results show that at the initial oxidation stage the mixture of δ-Al2O3, γ-Al2O3 and α-Al2O3 is formed on the sample surface rapidly. Especially, δ-Al2O3 and γ-Al2O3 prefer growing at the grain boundaries of CoCrAlY coating. With increasing oxidation time,δ-Al2O3 and γ-Al2O3 transform to θAl2O3, afterwards θ-Al2O3 transforms to α-Al2O3 gradually. After 180 min oxidation, θ-Al2O3 transforms into α-Al2O3 completely. |
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| Keywords: | CoCrAlY coating oxidation Al2O3 phase transformation |
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