- Size Control of Nd-Fe-B Precursor Particles Prepared by Spray Drying and Its Effect on the Magnetic Properties of Nd-Fe-B Alloy Powders after Reduction-Diffusion
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Youn-Kyoung Baek, Young-Taek Seo, Jung-Goo Lee, Dong Su Kim, Dong Sik Bae, Chul-Jin Choi
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J Powder Mater. 2013;20(5):359-365.
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DOI: https://doi.org/10.4150/KPMI.2013.20.5.359
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- In this study, we fabricated Nd_2Fe_14B hard magnetic powders with various sizes via spray drying combined with reduction-diffusion process. Spray drying is widely used to produce nearly spherical particles that are relatively homogeneous. Thus, the precursor particles were prepared by spray drying using the aqueous solution containing Nd salts, Fe salts and boric acid with the target stoichiometric composition of Nd_2Fe_14B. The mean particle sizes of the spray-dried powders are in the range from one to seven micrometer, which are adjusted by controlling the concentrations of precursor solutions. After debinding the as-prepared precursor particles, ball milling was also conducted to control the particle sizes of Nd-Fe-B oxide powders. The resulting particles with different sizes were subjected to subsequent treatments including hydrogen reduction, Ca reduction and washing for CaO removal. The size effect of Nd-Fe-B oxide particles on the formation of Nd_2Fe_14B phase and magnetic properties was investigated.
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Citations
Citations to this article as recorded by  - Research trend in Fabrication of Metastable-phase Iron Nitrides for Hard Magnetic Applications
Kyung Min Kim, Jung-Goo Lee, Kyung Tae Kim, Youn-Kyoung Baek
Journal of Korean Powder Metallurgy Institute.2019; 26(2): 146. CrossRef - Synthesize of Nd2Fe14B Powders from 1-D Nd2Fe14B Wires using Electrospinning Process
Nu Si A Eom, Su Noh, Muhammad Aneeq Haq, Bum Sung Kim
Journal of Korean Powder Metallurgy Institute.2019; 26(6): 477. CrossRef
- The Effect of Mn Addition on Nitrogenation Behavior and Magnetic Properties of Sm-Fe Alloy Powder Produced by Reduction-diffusion Method
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Young-Taek Seo, Youn-Kyoung Baek, Jung-Goo Lee, Chul-Jin Choi
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J Powder Mater. 2013;20(1):13-18.
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DOI: https://doi.org/10.4150/KPMI.2013.20.1.013
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Abstract
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- In the present study, we systematically investigated the effect of Mn addition on nitrogenation behavior and magnetic properties of Sm-Fe powders produced by reduction-diffusion process. Alloy powders with only Sm_2(Fe,Mn)_17 single phase were successfully produced by the reduction-diffusion process. The coercivity of Sm_2(Fe,Mn)_17 powder rapidly increased during nitrogenation and reached the maximum of 637 Oe after 16 hours. After further nitrogenation, it decreased. In contrast, the coercivity of Sm_2Fe_17 powder gradually increased during nitrogenation for 24 hours. The coercivity of Sm_2(Fe,Mn)_17 powder was higher than that of Sm_2Fe_17 powder at the same condition of nitrogenation. It was considered that the Mn addition facilitates the nitrogenation of Sm_2Fe_17 powder and enhances the coercivity.
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