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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2014.1
- 수록면
- 909 - 914 (6page)
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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 afterhomogenization heat treatment. During desorption-recombination stage, dehydrogenation speed and timewere systematically changed to control the speed of the desorption-recombination reaction. The higher Nd contentresulted in better magnetic properties of the HDDR powder, and this was attributed to the thicker and more uniformNd-rich phase at grain boundaries. It was also confirmed that the slow dehydrogenation speed could maximizethe effect of high Nd content on the magnetic properties of HDDR powder. At the optimized dehydrogenationspeed, 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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