Influence of Cooling Condition of Casted Strips on Magnetic Properties of Nd–Fe–B Sintered Magnets
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We investigated the additional (secondary) cooling effect of casted strips on the magnetic properties of Nd–Fe–B sintered magnets. The Nd–Fe–B sintered magnets were fabricated with the casted strips prepared without and with additional cooling. Additional cooling was achieved by blowing Ar gas at various pressures (0.1, 0.3, and 0.6 MPa) on the free-side surface of the strips during the strip-casting process. The higher magnetic properties of Hc, Br, and (BH)max of the final Nd–Fe–B sintered magnets were obtained for 0.1 MPa rather than for 0.0 MPa. The best microstructure of the columnar grains in the casted strips was produced with the aid of a lower pressure of gas on the free-side surface. It was found that the microstructure of the strips affects the distribution of grains grown in the sintered magnets. This report demonstrates that the improved magnetic performance of Nd–Fe–B sintered magnets was achieved via additional gas cooling.
KeywordsNd–Fe–B sintered magnet Strip casting Additional cooling Magnetic properties
This work was supported by the Priority Research Centers Program (2009-0093823) through the National Research Foundation of Korea (NRF). H-S Lee thanks the Basic Science Research Program offered through the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2015R1C1A2A01055702 and NRF-2018R1A2B6007169).
- 13.L. Cai, S. Cuo, C. Yan, X. Zhang, R. Chen, L. Liu, D. Lee, A. Yan, IEEE Trans. Magn. 50, 2103603 (2014)Google Scholar
- 17.L. Bo, H. Jifan, W. Dongling, G. Binglin, W. Xinlin, Rare Met. 23, 152 (2004)Google Scholar
- 33.S.Z. Zhou, Rare-Earth Permanent Magnet Materials and Their Applications (Metallurgical Industry Press, Beijing, 1995), p. 128Google Scholar