高(Cr,Al)含量NiCrAl(Y)涂层电沉积制备及抗高温氧化性能
Electrodeposition of NiCrAl(Y) Coatings with High Contents of Cr and Al and Their Oxidation Resistance
查看参考文献26篇
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文摘
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NiCrAlY型涂层是典型的抗高温氧化涂层以及热障涂层(thermal barrier coatings, TBCs)的黏结层(bond coat, BC)。高性能NiCrAlY涂层一般采用物理气相沉积的方法制备,本工作在金属基体预沉积的纳米颗粒CrAl电泳层中电沉积Ni,制备NiCrAl涂层。涂层的微观结构和成分分析表明:涂层致密并与金属基体结合好,CrAl纳米颗粒分散均匀、(Cr + Al)含量高达35%(质量分数,下同)。氧化结果表明:通过成分调控,即调控Cr/Al含量比,可使涂层在1000 ℃空气中氧化时分别“智能”热生长保护性Cr_2O_3膜或Al_2O_3膜;并且涂层在长时间氧化过程中,氧化膜不剥落,显示此工艺制备NiCrAl的抗氧化性能可与PVD制备的NiCrAlY涂层的相媲美。 |
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其他语种文摘
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NiCrAlY coatings have been widely employed as the coatings to risist high temperature oxidation, hot corrosion and also the bond coat (BC) under thermal barrier coatings (TBCs). High quality NiCrAlY coatings are currently always manufactured by means of physical vapor deposition (PVD). This work prepared new NiCrAl nanocomposite coatings through electrodeposition of Ni into a porous CrAl nanoparticle layer pre-deposited electrophoretically on a metallic substrate. Microstructural observation shows that the as-deposited NiCrAl coatings, where the CrAl nanoparticles with the maximum mass percentage reaching 35 are uniformly dispersed, are dense and well bonded to the substrate. Oxidation in air at 1000 ℃ shows that the NiCrAl coatings can “smartly” grow a protective scale of either Cr_2O_3 or Al_2O_3, depending on the ratio of the content of Cr to Al which can be controlled during electrophoretic deposition. In the meantime, no spallation occurs even though the coatings oxidized for hundreds of hours.It is implying that the NiCrAl coatings are as good as the NiCrAlY coatings prepared by PVD in resistance to high temperature oxidation. This work paves a new way for manufacturing high quality NiCrAl(Y) coatings employed as overlay coat and BC, through electrodeposition with the merits of ease of fabrication and low cost as well as high efficiency. |
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来源
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航空材料学报
,2018,38(2):52-58 【核心库】
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DOI
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10.11868/j.issn.l005-5053.2018.001006
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关键词
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NiCrAlY
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高温氧化
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电沉积
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电泳
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纳米复合涂层
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地址
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1.
中国科学技术大学材料科学与工程学院, 合肥, 230026
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中国科学院金属研究所金属腐蚀与防护实验室, 沈阳, 110016
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南昌航空大学材料科学与工程学院, 南昌, 330063
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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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1005-5053 |
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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:6227031
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