Transient oxidation behavior of nanocrystalline CoCrAlY coating at 1 050 ℃
查看参考文献19篇
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文摘
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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 ℃ 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-Al_2O_3,γ-Al_2O_3 and α-Al_2O_3 is formed on the sample surface rapidly. Especially, δ-Al_2O_3 and γ-Al_2O_3 prefer growing at the grain boundaries of CoCrAlY coating. With increasing oxidation time, δ-Al_2O_3 and γ-Al_2O_3 transform to θ-Al_2O_3, afterwards θ-Al_2O_3 transforms to α-Al_2O_3 gradually. After 180 min oxidation, θ-Al_2O_3 transforms into α-Al_2O_3 completely. |
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来源
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Transactions of Nonferrous Metals Society of China
,2007,17(3):595-599 【核心库】
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DOI
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10.1016/s1003-6326(07)60140-x
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关键词
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CoCrAlY coating
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oxidation
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Al_2O_3
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phase transformation
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地址
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1.
Institute of Metal Research, Chinese Academy of Sciences, Shenyang National Laboratory for Materials Science, Shenyang, 110016
2.
School of Materials Science and Engineering, Nanchang Institute of Aeronautical Technology, Nanchang, 330034
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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1003-6326 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:2827758
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