Breakaway oxidation of a low-Al content nanocrystalline coating at 1000 degrees C

doi:10.1016/j.surfcoat.2018.12.034

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	Breakaway oxidation of a low-Al content nanocrystalline coating at 1000 degrees C
	Sun, Wenyao 1,4; Chen, Minghui 3; Bao, Zebin 1; Wu, Changjun 2; Zhu, Shenglong 1,4; Wang, Fuihui 1,3
刊名	SURFACE & COATINGS TECHNOLOGY
	2019-01-25
卷号	358 页码:958-967
关键词	Superalloys Nanocrystalline coating High-temperature oxidation
ISSN号	0257-8972
DOI	10.1016/j.surfcoat.2018.12.034
通讯作者	Chen, Minghui(mhchen@mail.neu.edu.cn) ; Bao, Zebin(zbbao@imr.ac.cn)
英文摘要	Nanocrystalline coating though with low Al reservoir shows high oxidation and spallation resistance, owing to its high density of defects and grain boundaries. It now attracts growing attention. However, with oxidation going on, its stability is always a significant concern since such a high-temperature protective coating should be designed with a long life-expectancy when the nano-sized grains have grown and the reserved Al has been consumed a lot. Yet, this issue has never been clarified. To identify the exact mode of breakaway oxidation, a nanocrystalline coating was prepared with very low Al content that could decrease fast to a critical value in a very short oxidation time. Its oxidation behaviour related with the stability was studied in detail at 1000 degrees C. Results indicate that an intact external alumina scale still forms at the surface of the nanocrystalline coating initially. However, after 100 h exposure, grains growing and the continuous consuming of Al of the nanocrystalline coating lead to oxidation of Ti and doping of titanium oxide in the alumina scale, which was accompanied with the formation of abundant micropores and cracks. Thereafter, scale spalls off and abundant less-protective oxides, e.g. TiO2, NiCr2O4, NiTiO3, form, and breakaway oxidation occurs.
资助项目	National Natural Science Foundation of China[51671053] ; Jiangsu Province Key Laboratory of Materials Surface Science and Technology[KFBM20170001]
WOS研究方向	Materials Science ; Physics
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000456762300113
资助机构	National Natural Science Foundation of China ; Jiangsu Province Key Laboratory of Materials Surface Science and Technology
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/131342]
专题	金属研究所_中国科学院金属研究所
通讯作者	Chen, Minghui; Bao, Zebin
作者单位	1.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Corros & Protect Div, Shenyang 110016, Liaoning, Peoples R China 2.Changzhou Univ, Jiangsu Key Lab Mat Surface Sci & Technol, Changzhou 213164, Jiangsu, Peoples R China 3.Northeastern Univ, Shenyang Natl Lab Mat Sci, Corros & Protect Div, Shenyang 110819, Liaoning, Peoples R China 4.Univ Sci & Technol China, Coll Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Sun, Wenyao,Chen, Minghui,Bao, Zebin,et al. Breakaway oxidation of a low-Al content nanocrystalline coating at 1000 degrees C[J]. SURFACE & COATINGS TECHNOLOGY,2019,358:958-967.
APA	Sun, Wenyao,Chen, Minghui,Bao, Zebin,Wu, Changjun,Zhu, Shenglong,&Wang, Fuihui.(2019).Breakaway oxidation of a low-Al content nanocrystalline coating at 1000 degrees C.SURFACE & COATINGS TECHNOLOGY,358,958-967.
MLA	Sun, Wenyao,et al."Breakaway oxidation of a low-Al content nanocrystalline coating at 1000 degrees C".SURFACE & COATINGS TECHNOLOGY 358(2019):958-967.