The preparation and hot corrosion resistance of gradient NiCoCrAlYSiB coatings

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	The preparation and hot corrosion resistance of gradient NiCoCrAlYSiB coatings
	M. H. Guo; Q. M. Wang; P. L. Ke; J. Gong; C. Sun; R. F. Huang; L. S. Wen
	2006
发表期刊	Surface & Coatings Technology
ISSN	0257-8972
卷号	200 期号:12-13 页码:3942-3949
摘要	An Al and Cr gradient NiCoCrAlYSiB coating was prepared by a two-step deposition: (i) deposition of a NiCoCrAlYSiB layer onto Ni-based superalloy surface by arc ion plating (AIP); and (ii) co-deposition of NiCoCrAlYSiB and Cr-Al by AIP and magnetron sputtering (MS), respectively. The results of EPMA show that Al and Cr have a gradient distribution in the surface layer of the gradient coatings. After annealing, the NiCoCrAlYSiB coatings consist of gamma/gamma' and beta-NiAl, while the gradient coatings consist of sigma-(Cr, Co), AlCr2, and Al8Cr5, besides gamma/gamma' and beta-NiAl. The phases of sigma-(Cr, Co), AlCr2, and Al8Cr5 can act as reservoir phases of Cr and Al to improve the hot corrosion resistance and lifetime of the coatings. In order to investigate the effect of Al and Cr on the hot corrosion of coatings, NiCoCrAlYSiB coatings and the gradient coatings were coated with 0.5 mg (Na2SO4+K2SO4 20 wt.% salt mixture)/cm(2) and oxidized at 900 degrees C for 20 h. XRD and EDS results show that there are only the alumina formed on the NiCoCrAlYSiB coatings, so the basic fluxing of Al2O3 occurred, which caused an accelerated hot corrosion after 10 h. For the gradient coatings, there formed Al2O3 and Cr2O3 at the primary stage of hot corrosion. Cr2O3 is easier to react with Na2SO4 than Al2O3, which reduces the oxygen ion activity of Na2SO4, so Al2O3 was protected. The formation of the continual and protective layer of Al2O3 and Cr2O3 leads to the hot corrosion kinetics of gradient coatings similar to oxidation kinetics. (c) 2004 Elsevier B.V. All rights reserved.
部门归属	chinese acad sci, inst met res, state key lab corros & protect, dept surface engn mat, shenyang 110016, peoples r china.;wen, ls (reprint author), chinese acad sci, inst met res, state key lab corros & protect, dept surface engn mat, 72 wenhua rd, shenyang 110016, peoples r china;csun@imr.ac.cn lswen@imrac.cn
关键词	Gradient Mcraly Coatings Arc Ion Plating (Aip) Hot Corrosion Nicocralysib Thermal Barrier Coatings Mcraly Coatings Oxidation Behavior Alloys Scales
URL	查看原文
WOS记录号	WOS:000235981600034
引用统计	被引频次：60[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/34227
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	M. H. Guo,Q. M. Wang,P. L. Ke,et al. The preparation and hot corrosion resistance of gradient NiCoCrAlYSiB coatings[J]. Surface & Coatings Technology,2006,200(12-13):3942-3949.
APA	M. H. Guo.,Q. M. Wang.,P. L. Ke.,J. Gong.,C. Sun.,...&L. S. Wen.(2006).The preparation and hot corrosion resistance of gradient NiCoCrAlYSiB coatings.Surface & Coatings Technology,200(12-13),3942-3949.
MLA	M. H. Guo,et al."The preparation and hot corrosion resistance of gradient NiCoCrAlYSiB coatings".Surface & Coatings Technology 200.12-13(2006):3942-3949.