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A magnetron sputtered microcrystalline beta-NiAl coating for SC superalloys. Part I. Characterization and comparison of isothermal oxidation behavior at 1100 degrees C with a NiCrAlY coating
S. J.; Zhu Hou, S. L.; Zhang, T.; Wang, F. H.
2015
Source PublicationApplied Surface Science
ISSN0169-4332
Volume324Pages:1-12
AbstractA microcrystalline beta-NiAl coating was prepared on a single-crystal (SC) superalloy substrate via magnetron sputtering and subsequent vacuum annealing. The grain sizes of the coating ranged from about 300 nm to 1 mu m. A reference NiCrAlY coating, which was mainly comprised of gamma'-Ni3Al and alpha-Cr, was prepared by means of vacuum arc evaporation (VAE). Isothermal oxidation tests were carried out at 1100 degrees C in air for 50 h. Both coatings formed thin and adherent alpha-Al2O3 scales during tests, while the oxide scales on the bare superalloy primarily consisted of spinel (Ni,Co)Al2O4 with underlying alpha-Al2O3 scale. The parabolic rate constant of the NiAl-coated specimens was about one order of magnitude lower than that of the NiCrAlY coated specimens. After oxidation tests, only a small amount of gamma' phase was detected at some columnar boundaries of the beta-NiAl coating, and about 2/3 parts of the NiCrAlY coating transformed into gamma phase which resolved the alpha-Cr precipitations, while an Al-depleted zone in thickness of about 10 mu m formed beneath the TGO of the bare superalloy. Inter-diffusion zones and secondary reaction zones were observed on the specimens coated by either beta-NiAl or NiCrAlY. The oxidation mechanism and microstructure evolvement of the specimens during high temperature exposures were discussed. (C) 2014 Elsevier B.V. All rights reserved.
description.department[hou, shaojun ; zhu, shenglong ; zhang, tao ; wang, fuhui] chinese acad sci, inst met res, shenyang 110016, peoples r china. [hou, shaojun ; zhang, tao ; wang, fuhui] harbin engn univ, key lab superlight mat & surface technol, corros & protect lab, minist educ, harbin 150001, peoples r china. ; zhu, sl (reprint author), chinese acad sci, inst met res, 62 wencui rd, shenyang 110016, peoples r china. ; slzhu@imr.ac.cn
KeywordMicrocrystalline Beta-nial Magnetron Sputtering High Temperature Oxidation Inter-diffusion Scale Adherence High-temperature Oxidation Single-crystal Superalloys Thermal Barrier Coatings Bond Coat Alumina Scale Sulfur Segregation Diffusion Barrier Reactive Elements Grown Oxide Tgo Growth
URL查看原文
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/73817
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
S. J.,Zhu Hou, S. L.,Zhang, T.,et al. A magnetron sputtered microcrystalline beta-NiAl coating for SC superalloys. Part I. Characterization and comparison of isothermal oxidation behavior at 1100 degrees C with a NiCrAlY coating[J]. Applied Surface Science,2015,324:1-12.
APA S. J.,Zhu Hou, S. L.,Zhang, T.,&Wang, F. H..(2015).A magnetron sputtered microcrystalline beta-NiAl coating for SC superalloys. Part I. Characterization and comparison of isothermal oxidation behavior at 1100 degrees C with a NiCrAlY coating.Applied Surface Science,324,1-12.
MLA S. J.,et al."A magnetron sputtered microcrystalline beta-NiAl coating for SC superalloys. Part I. Characterization and comparison of isothermal oxidation behavior at 1100 degrees C with a NiCrAlY coating".Applied Surface Science 324(2015):1-12.
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