Study of high-coercivity sintered NdFeB magnets |
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| Authors: | G. Bai R.W. Gao Y. Sun G.B. Han B. Wang |
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| Affiliation: | 1. School of Physics and Microelectronics, Shandong University, Jinan, 250100, PR China;2. Department of Mathematics and Physics, Xi’an Institute of Technology, Xi’an, 710032, PR China;3. Baotou Rare Earth Research Institute, Batou 014030, PR China |
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| Abstract: | Magnetic powders for sintered NdFeB magnets have been prepared by using an advanced processing method including strip casting, hydrogen decrepitation, jet milling and rubber isotropic press. The effects of Dy, Ga and Co addition on the microstructure and magnetic properties of sintered magnets have been investigated. By adopting a suitable component ratio and adjusting proper technological parameters, we have prepared high-coercivity sintered NdFeB magnets with hard magnetic properties of jHc=25.6 kOe, Br=13.2 kG and (BH)max=39.9 MGOe. The temperature coefficient of coercivity of the magnets (between 20 and 150 °C) is –0.53%/°C. The magnetic properties at high temperature satisfy the needs of permanent magnet motors. |
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| Keywords: | 75.30.E 75.30.G 75.50.T |
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