On high-temperature oxidation and protection of 2:17-type SmCo-based magnets

IMR OpenIR

	On high-temperature oxidation and protection of 2:17-type SmCo-based magnets
	Peng, Xiao; Zhao, Hongbo; Wang, Xiaolan; Guo, Zhaohui; Li, Wei; Wang, Fuhui; xpeng@imr.ac.cn
	2015
发表期刊	CORROSION REVIEWS
ISSN	0334-6005
卷号	33 期号:42433 页码:139-150
摘要	Sm-2(Co,Cu,Fe,Zr)(17) are the best high-temperature permanent magnets because of their high Curie temperature (800 degrees C-850 degrees C). However, irreversible and unacceptable coercivity losses retard their use in applications at temperatures over 550 degrees C. The coercivity loss has been correlated with poor oxidation resistance at high temperatures. The current research progress on the effect of oxidation and its prevention, for 2:17-type magnets, is reviewed. Oxidation in air at 500 degrees C-700 degrees C causes the magnets to form three regions: (1) an external oxide scale mainly consisting of (CoxFe1-x)(3)O-4, (2) a thicker internal oxidation zone where the typical cellular precipitation (2:17R cell and 1:5H cell boundary) structure has been completely collapsed due to the Sm oxidation into Sm2O3, and (3) an oxidation-free zone where the cellular precipitates remain unchanged in lattice structure. No unacceptable coercivity loss is seen in the oxidation-free zone. Its thickness can be impressively increased within the magnets at high temperature, when they are covered with surface diffusion barriers for oxygen from the atmosphere, such as thin films of Cr2O3, Al2O3, and the metals with the ability to thermally grow these oxides.
部门归属	[peng, xiao ; zhao, hongbo ; wang, xiaolan ; wang, fuhui] chinese acad sci, inst met res, lab corros & protect, shenyang 110016, peoples r china ; [guo, zhaohui ; li, wei] cent iron & steel res inst, div funct mat, beijing 100081, peoples r china
关键词	Coating Coercivity High-temperature Magnet Magnetic Properties Oxidation
资助者	National Basic Research Program of China, Ministry of Science and Technology [2010CB934604]
收录类别	sci
语种	英语
WOS记录号	WOS:000358316300003
引用统计	被引频次：6[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/321006/75030
专题	中国科学院金属研究所
通讯作者	xpeng@imr.ac.cn
推荐引用方式 GB/T 7714	Peng, Xiao,Zhao, Hongbo,Wang, Xiaolan,et al. On high-temperature oxidation and protection of 2:17-type SmCo-based magnets[J]. CORROSION REVIEWS,2015,33(42433):139-150.
APA	Peng, Xiao.,Zhao, Hongbo.,Wang, Xiaolan.,Guo, Zhaohui.,Li, Wei.,...&xpeng@imr.ac.cn.(2015).On high-temperature oxidation and protection of 2:17-type SmCo-based magnets.CORROSION REVIEWS,33(42433),139-150.
MLA	Peng, Xiao,et al."On high-temperature oxidation and protection of 2:17-type SmCo-based magnets".CORROSION REVIEWS 33.42433(2015):139-150.