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Effect of the dehydrogenation speed and Nd content on the microstructure and magnetic properties of HDDR processed Nd-Fe-B magnets |
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| Authors: | Hee-Ryoung Cha Ji-Hun Yu Youn-Kyoung Baek Hae-Woong Kwon Tae-Hoon Kim Cheol-Woong Yang Tea-Soo Lim Yang-Do Kim Jung-Goo Lee |
| Affiliation: | 1. Powder&Ceramics Division, Korea Institute of Materials Science, 797 Changwondaero, Changwon, 642-831, Korea 4. School of Materials Science and Engineering, Pusan National University, Jangjeon 2-dong, Geumjeong-gu, Busan, 609-735, Korea 2. Department of Materials Science and Engineering, Pukyong National University, 45 Yongso-ro, Nam-Gu, Busan, 608-737, Korea 3. School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, 440-746, Korea |
| Abstract: | The effect of Nd content and dehydrogenation speed on the microstructure and magnetic properties of hydrogenation-disproportionation-desorption-recombination (HDDR) processed Nd-Fe-B magnetic powders was studied. The NdxB6.4Ga0.3Nb0.2Febal (x=12.5–13.5, at.%) mold casting alloys were subjected to HDDR process after homogenization heat treatment. During desorption-recombination stage, dehydrogenation speed and time were systematically changed to control the speed of the desorption-recombination reaction. The higher Nd content resulted in better magnetic properties of the HDDR powder, and this was attributed to the thicker and more uniform Nd-rich phase at grain boundaries. It was also confirmed that the slow dehydrogenation speed could maximize the effect of high Nd content on the magnetic properties of HDDR powder. At the optimized dehydrogenation speed, the coercivity and remanence was 15.3 kOe and 13.0 kG, respectively, at 12.9 at.% Nd content, which resulted in a (BH)max of 36.8 MGOe. |
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