Achievement of high coercivity in sintered R-Fe-B magnets based on misch-metal by dual alloy method

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	Achievement of high coercivity in sintered R-Fe-B magnets based on misch-metal by dual alloy method
	Niu, E ; Chen, ZA ; Chen, GA ; Zhao, YG ; Zhang, J ; Rao, XL ; Hu, BP ; Wang, ZX
刊名	JOURNAL OF APPLIED PHYSICS
	2014
卷号	115 期号:11
关键词	boron alloys coercive force grain boundary diffusion iron alloys magnetic annealing permanent magnets rare earth alloys sintering
ISSN号	0021-8979
通讯作者	Niu, E (reprint author), Chinese Acad Sci, Inst Phys, State Key Lab Magnetism, POB 603, Beijing 100190, Peoples R China.
中文摘要	The R-Fe-B (R, rare earth) sintered magnets prepared with different ratio of alloys of MM-Fe-B (MM, misch-metal) and Nd-Fe-B by dual alloy method were investigated. As expected, the high ratio of MM Fe-B alloy degrades the hard magnetic properties heavily with intrinsic coercivity lower than 5 kOe. When the atomic ratio MM/R <= 21.5% the magnetic properties can reach a practical level of B r >= 12.1 kGs, H cj >= 10.7 kOe, and (BH) max >= 34.0 MGOe. And the effect of H cj enhancement by the grain boundary diffusion process is obvious when MM/R <= 21.5%. It is revealed that the decrement of intrinsic magnetic properties of R2Fe14B matrix phase is not the main reason of the degradation of the magnets with high MM ratio. The change of deteriorated microstructure together with phase component plays fundamental roles in low H cj. In high MM ratio magnets, (a) after annealing, Ce atoms inside main phase are inclined to be segregated in the outer layer of the main phase grains; (b there is no thin layer of Ce-rich phase as an analogue of Nd-rich phase to separate main phase grains; (c) excessive Ce tends to form CeFe2 grains.
资助信息	National High-Tech Research and Development Program of China (863 Program) [2011AA03A401]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59166]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Niu, E,Chen, ZA,Chen, GA,et al. Achievement of high coercivity in sintered R-Fe-B magnets based on misch-metal by dual alloy method[J]. JOURNAL OF APPLIED PHYSICS,2014,115(11).
APA	Niu, E.,Chen, ZA.,Chen, GA.,Zhao, YG.,Zhang, J.,...&Wang, ZX.(2014).Achievement of high coercivity in sintered R-Fe-B magnets based on misch-metal by dual alloy method.JOURNAL OF APPLIED PHYSICS,115(11).
MLA	Niu, E,et al."Achievement of high coercivity in sintered R-Fe-B magnets based on misch-metal by dual alloy method".JOURNAL OF APPLIED PHYSICS 115.11(2014).