Grain refinement in heavy rare earth element-free sintered Nd-Fe-B magnets by addition of a small amount of molybdenum
- Authors
- Kim, Jin Woo; Lee, Won Suk; Byun, Jong Min; Kim, Se Hoon; Kim, Young Do
- Issue Date
- May-2015
- Publisher
- AMER INST PHYSICS
- Citation
- JOURNAL OF APPLIED PHYSICS, v.117, no.17, pp.1 - 5
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF APPLIED PHYSICS
- Volume
- 117
- Number
- 17
- Start Page
- 1
- End Page
- 5
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/157344
- DOI
- 10.1063/1.4916496
- ISSN
- 0021-8979
- Abstract
- We employed a modified refractory-metal-addition method to achieve higher coercivity and remanence in heavy rare earth element (HREE)-free Nd-Fe-B sintered magnets. This process involved inducing the formation of a homogeneous secondary phase at the grain boundaries during sintering, making it possible to control the intergrain diffusion by adding small amounts of Mo, a refractory metal. To control the microstructure of the secondary phase effectively, a metal organic compound of the refractory metal was coated on the surfaces of the particles of an HREE-free Nd-Fe-B powder. The average grain size after this process was 5.60 mu m, which was approximately 1.8 mu m smaller than that of the HREE-free sintered Nd-Fe-B magnets (7.4 mu m). The coercivity of the magnets prepared through this process could be increased from 11.88 kOe to 13.91 kOe without decreasing their remanence.
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