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Magnetic properties of high coercivity Nd23Dy10Fe64TM2B1 sintered magnets by a convergent heat treatment

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Abstract

The magnetic property of Nd23Dy10Fe64TM2B1 alloy was investigated by the convergent heat treatment at 350 to 450°C with the heating/cooling rate of 10°C/min in vacuum (10−5 Torr). The convergent heat treatment was introduced by two mechanisms for the microstructure modification. One is the penetration of Nd-rich phases into the Nd2Fe14B grains, which results in the isolation of Nd2Fe14B hard magnet phases. The other is the reduction of crack formation, which is often caused by repeated heating/cooling processes. The result of the convergent heat treatment was compared to that of the cyclic heat treatment, which is known to progress through the mechanism involving thermal expansion coefficients differences. Thus, the effect of the crack formation in the Nd2Fe14B grains to magnetic properties was restrained by the convergent heat treatment. Consequently, the coercivity was enhanced from 32.5 kOe to about 34.1 kOe after eight cycles of the convergent heat treatment with maintaining a remanence of 1.18 T.

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Acknowledgments

This research was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea.

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  1. Department of Materials Science and Engineering, Hanyang University, Haengdang-Dong 17, Seongdong-Ku, Seoul, 133-791, Korea

    Hoon-sup Kim, Se Hoon Kim, Jin Woo Kim, Young Jung Lee, Dae-Gun Kim & Young Do Kim

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  1. Hoon-sup Kim
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  2. Se Hoon Kim
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  3. Jin Woo Kim
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  4. Young Jung Lee
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  5. Dae-Gun Kim
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Correspondence to Young Do Kim.

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Kim, Hs., Kim, S.H., Kim, J.W. et al. Magnetic properties of high coercivity Nd23Dy10Fe64TM2B1 sintered magnets by a convergent heat treatment. Res Chem Intermed 36, 859–866 (2010). https://doi.org/10.1007/s11164-010-0193-7

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