Study of high-coercivity sintered NdFeB magnets

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...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2007, Vol.308 (1), p.20-23
Main Authors: Bai, G., Gao, R.W., Sun, Y., Han, G.B., Wang, B.
Format: Article
Language:English
Subjects:
Advanced processing
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
High coercivity
Magnetic properties and materials
Permanent magnets
Physics
Sintered NdFeB magnets
Studies of specific magnetic materials
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Summary: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 j H c=25.6 kOe, B r=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.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2006.04.029