Morphologic investigation and growth of the alumina scale on magnetron-sputtered CoCrAlNCs with and without yttrium

IMR OpenIR

	Morphologic investigation and growth of the alumina scale on magnetron-sputtered CoCrAlNCs with and without yttrium
	X. Peng; F. Wang
	2003
发表期刊	Corrosion Science
ISSN	0010-938X
卷号	45 期号:10 页码:2293-2306
摘要	Nanostructured coatings exhibit superior oxidation resistance due to preferable formation of pure alpha-Al2O3 scale. In this work, the morphology and growth of the scale formed on magnetron-sputtered CoCrAl nanocoatings (NCs) with and without yttrium at 1000, 1100 and 1200 degreesC have been investigated in detail, by scanning electron microscopy observations of the time-dependent evolution of the scale surface and cross-sectional features. There were several observations: (1) intrinsic oxide ridges appeared on the surface scale on both NCs but their appearance was delayed on CoCrAlY, (2) CoCrAl coating tended to form a scale which was composed of multi-layered equiaxed crystals, especially at 1100 and 1200 degreesC, while the scale on CoCrAlY appeared double-layered and with inner columnar-like grains, (3) large interface cavities appeared after oxidation of CoCrAl at 1100 and 1200 degreesC but it was not be observed for oxidation of CoCrAlY. The results strongly suggest that the contribution of outward aluminum diffusion to the growth of the alpha-Al2O3 scale on both NCs is increased with an increase of time and temperature, and that it was reduced in the presence of yttrium. Additionally, compared to the scale on the normal commercial MCrAl (M = Fe, Ni, Co) alloys, the scale formed on the NCs is finer-grained and wrinkle-resistant. Based on the morphological investigation, a growth mechanism of the alumina scale on both NCs was proposed. (C) 2003 Published by Elsevier Ltd.
部门归属	chinese acad sci, inst met res, state key lab corros & protect met, shenyang 110016, peoples r china.;peng, x (reprint author), chinese acad sci, inst met res, state key lab corros & protect met, 62 wencui rd, shenyang 110016, peoples r china
关键词	Oxide Growth Oxidation Cocral Yttrium Magnetron-sputtering Nanocoating Fe-cr-al Oxidation Behavior Reactive Elements Oxide Scales Alloys Segregation Resistance Mechanism Additions Coatings
URL	查看原文
WOS记录号	WOS:000185223200011
引用统计	被引频次：37[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/321006/35997
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. Peng,F. Wang. Morphologic investigation and growth of the alumina scale on magnetron-sputtered CoCrAlNCs with and without yttrium[J]. Corrosion Science,2003,45(10):2293-2306.
APA	X. Peng,&F. Wang.(2003).Morphologic investigation and growth of the alumina scale on magnetron-sputtered CoCrAlNCs with and without yttrium.Corrosion Science,45(10),2293-2306.
MLA	X. Peng,et al."Morphologic investigation and growth of the alumina scale on magnetron-sputtered CoCrAlNCs with and without yttrium".Corrosion Science 45.10(2003):2293-2306.