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溅射NiCrAlY涂层氧化过程Al_2O_3膜结构与形貌的转变
Phase and morphology transformation of Al_2O_3 during oxidation of sputtered NiCrAlY coatings
查看参考文献7篇
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文摘
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对溅射NiCrAlY涂层进行了900 ℃, 1000 ℃, 1100 ℃空气中高温氧化。实验表明，氧化初期生成快速长大的亚稳态θ-Al_2O_3相，随着氧化时间延长，θ-Al_2O_3逐渐变成α-Al_2O_3，氧化动力学抛物线常数k_p也随之下降。θ→α-Al_2O_3相变速度与温度有关，温度越高，相变越快。对涂层进行真空热处理可促进θ→α-Al_2O_3转变，使涂层表面快速形成保护性能优异的α-Al_2O_3。 |
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其他语种文摘
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The isothermal oxidation of sputtered NiCrAlY coatings was performed in air at 900 ℃, 1000 ℃ and 1100 ℃. Transient alumina θ-Al_2O_3, with fast growing rate, was formed on the surface of the coatings in the initial stage of oxidation. With oxidation time increasing, θ-Al_2O_3 transformed into α-Al_2O_3, and hence the parabolic rate constant decreased. The higher the temperature, the faster the transformation of θ-Al_2O_3 into α-Al_2O_3. A pre-heat treatment of the sputtered NiCrAlY coatings in vacuum can accelerate the transformation of θ-Al_2O_3 into α-Al_2O_3, and there with the protective α-Al_2O_3 scale is formed more rapidly on the surface of the coatings. |
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来源
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腐蚀科学与防护技术
,2002,14(3):142-146 【核心库】
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关键词
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溅射NiCrAlY涂层
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高温氧化
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相变
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真空热处理
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地址
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1.
中国科学院金属研究所, 沈阳, 110016
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湖南大学材料科学与工程学院, 长沙, 410082
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语种
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中文 |
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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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1002-6495 |
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学科
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金属学与金属工艺 |
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文献收藏号
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CSCD:983838
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