NiCoCrAlY coatings with and without an Al2O3/Al interlayer on an orthorhombic Ti2AlNb-based alloy: Oxidation and interdiffusion behaviors

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	NiCoCrAlY coatings with and without an Al2O3/Al interlayer on an orthorhombic Ti2AlNb-based alloy: Oxidation and interdiffusion behaviors
	Q. M. Wang; K. Zhang; J. Gong; Y. Y. Cui; C. Sun; L. S. Wen
	2007
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	55 期号:4 页码:1427-1439
摘要	The mechanism of oxidation protection of NiCoCrAlY overlay coatings on the orthorhombic Ti(2)AINb-based alloy (O alloy) Ti-22Al-26Nb (at.%) is described. While the bare alloy exhibited poor oxidation resistance at 800 degrees C, adding NiCoCrAlY coatings significantly improved the oxidation resistance. However, serious interdiffusion between the coatings and the substrate resulted in rapid degradation of the coating system. Several reaction layers were formed at the coating/substrate interface by interdiffusion, and nonprotective scales mainly of Cr2O3 and TiO2 were formed due to the degradation of the coating. In order to solve this problem, an Al2O3/Al interlayer was sandwiched into the coating system as a diffusion barrier. The isothermal and cyclic oxidation protection of the multilayer coating system on the Ti-22Al-26Nb substrate was evaluated at 800 and 900 degrees C. The results indicated that the interdiffusion was much suppressed, and the duplex coating system demonstrated improved oxidation resistance on the Ti-22Al-26Nb substrate, with a thin and adherent protective alpha-Al2O3 scale forming on the surface. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	chinese acad sci, inst met res, div surface engn mat, shenyang 110016, peoples r china.;sun, c (reprint author), chinese acad sci, inst met res, div surface engn mat, 72 wenhua rd, shenyang 110016, peoples r china;csun@imr.ac.cn
关键词	Titanium Aluminide Nicocraly Coating Oxidation Interdiffusion Diffusion Barrier Thermal Barrier Coatings Ni-base Superalloys Deformation Mechanisms Air Ti 800-degrees-c Ti-22al-25nb Protection Resistance Diffusion
URL	查看原文
WOS记录号	WOS:000244548100028
引用统计	被引频次：90[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/321006/33870
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Q. M. Wang,K. Zhang,J. Gong,et al. NiCoCrAlY coatings with and without an Al2O3/Al interlayer on an orthorhombic Ti2AlNb-based alloy: Oxidation and interdiffusion behaviors[J]. Acta Materialia,2007,55(4):1427-1439.
APA	Q. M. Wang,K. Zhang,J. Gong,Y. Y. Cui,C. Sun,&L. S. Wen.(2007).NiCoCrAlY coatings with and without an Al2O3/Al interlayer on an orthorhombic Ti2AlNb-based alloy: Oxidation and interdiffusion behaviors.Acta Materialia,55(4),1427-1439.
MLA	Q. M. Wang,et al."NiCoCrAlY coatings with and without an Al2O3/Al interlayer on an orthorhombic Ti2AlNb-based alloy: Oxidation and interdiffusion behaviors".Acta Materialia 55.4(2007):1427-1439.