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A magnetron sputtered microcrystalline beta-NiAl coating for SC superalloys. Part II. Effects of a NiCrO diffusion barrier on oxidation behavior at 1100 degrees C
Yao, Hongrui; Bao, Zebin; Shen, Mingli; Zhu, Shenglong; Wang, Fuhui; Zhu, SL (reprint author), Chinese Acad Sci, Inst Met Res, Lab Corros & Protect, Shenyang 110016, Peoples R China.
2017-06-15
Source PublicationAPPLIED SURFACE SCIENCE
ISSN0169-4332
Volume407Pages:485-494
AbstractArc ion plated-NiCrO interlayer was fabricated as an active diffusion barrier for microcrystalline beta-NiAl coating on Ni-base single crystal Rene N5 superalloy. The effects of the NiCrO barrier layer on the cyclic oxidation behavior at 1100 degrees C were investigated. The microstructure of coated specimens was characterized by SEM, XRD, XPS and TEM. The microcrystalline beta-NiAl coating without NiCrO barrier layer exhibited good oxidation resistance by forming exclusive alpha-A1203 scales during cyclic oxidation tests at 1100 degrees C in air. However, the formation of thick interdiffusion zone (IDZ) and secondary reaction zone (SRZ), which accelerated coating degradation, was observed. The NiCrO barrier layer was transformed into alpha-Al2O3/Metal/alpha-Al2O3 sandwich structure during vacuum annealing at 1000 degrees C. The sandwich structure was adherent to the coating and the substrate, prevented the formation of IDZ and SRZ, and retarded the coating degradation effectively during cyclic oxidation tests. The mechanism for the formation of SRZ in NiAI coated single crystal superalloy and the mechanism for the transformation of NiCrO interlayer into alpha-Al2O3/Metal/alpha-Al2O3 sandwich structure were discussed. (C) 2017 Elsevier B.V. All rights reserved.; Arc ion plated-NiCrO interlayer was fabricated as an active diffusion barrier for microcrystalline beta-NiAl coating on Ni-base single crystal Rene N5 superalloy. The effects of the NiCrO barrier layer on the cyclic oxidation behavior at 1100 degrees C were investigated. The microstructure of coated specimens was characterized by SEM, XRD, XPS and TEM. The microcrystalline beta-NiAl coating without NiCrO barrier layer exhibited good oxidation resistance by forming exclusive alpha-A1203 scales during cyclic oxidation tests at 1100 degrees C in air. However, the formation of thick interdiffusion zone (IDZ) and secondary reaction zone (SRZ), which accelerated coating degradation, was observed. The NiCrO barrier layer was transformed into alpha-Al2O3/Metal/alpha-Al2O3 sandwich structure during vacuum annealing at 1000 degrees C. The sandwich structure was adherent to the coating and the substrate, prevented the formation of IDZ and SRZ, and retarded the coating degradation effectively during cyclic oxidation tests. The mechanism for the formation of SRZ in NiAI coated single crystal superalloy and the mechanism for the transformation of NiCrO interlayer into alpha-Al2O3/Metal/alpha-Al2O3 sandwich structure were discussed. (C) 2017 Elsevier B.V. All rights reserved.
description.department[yao, hongrui ; bao, zebin ; shen, mingli ; zhu, shenglong ; wang, fuhui] chinese acad sci, inst met res, lab corros & protect, shenyang 110016, peoples r china ; [yao, hongrui] univ chinese acad sci, beijing 100049, peoples r china
KeywordBeta-nial Oxidation Secondary Reaction Zone Diffusion Barrier
Subject AreaChemistry, Physical ; Materials Science, Coatings & Films ; Physics, Applied ; Physics, Condensed Matter
Funding OrganizationNational Key Basic Research Program of China (973 Program) [2012CB625100]; National Nature Science Foundation of China [51231001]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78086
Collection中国科学院金属研究所
Corresponding AuthorZhu, SL (reprint author), Chinese Acad Sci, Inst Met Res, Lab Corros & Protect, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Yao, Hongrui,Bao, Zebin,Shen, Mingli,et al. A magnetron sputtered microcrystalline beta-NiAl coating for SC superalloys. Part II. Effects of a NiCrO diffusion barrier on oxidation behavior at 1100 degrees C[J]. APPLIED SURFACE SCIENCE,2017,407:485-494.
APA Yao, Hongrui,Bao, Zebin,Shen, Mingli,Zhu, Shenglong,Wang, Fuhui,&Zhu, SL .(2017).A magnetron sputtered microcrystalline beta-NiAl coating for SC superalloys. Part II. Effects of a NiCrO diffusion barrier on oxidation behavior at 1100 degrees C.APPLIED SURFACE SCIENCE,407,485-494.
MLA Yao, Hongrui,et al."A magnetron sputtered microcrystalline beta-NiAl coating for SC superalloys. Part II. Effects of a NiCrO diffusion barrier on oxidation behavior at 1100 degrees C".APPLIED SURFACE SCIENCE 407(2017):485-494.
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