Journal
JOURNAL OF APPLIED PHYSICS
Volume 115, Issue 11, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4869202
Keywords
boron alloys; coercive force; grain boundary diffusion; iron alloys; magnetic annealing; permanent magnets; rare earth alloys; sintering
Categories
Funding
- National High-Tech Research and Development Program of China (863 Program) [2011AA03A401]
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available