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No.4(pp.97-127)
Home > Issues > Volume 9 (2004) > No.4(pp.97-127)
 
Study of the Enhancement of Magnetic Properties of NdFeB Materials Fabricated by Modified HDDR Process
Journal of Magnetics, Volume 9, Number 4, 31 Dec 2004, Pages 109-112
Meng Fu* (Department of Materials, College of Materials & Metallurgy, Northeastern University, Department of Materials, Jiangsu Polytechnic University), Fa-zeng Lian(Department of Materials, College of Materials & Metallurgy, Northeastern University), Ji-jie Wang(Department of Materials, College of Materials & Metallurgy, Northeastern University), Wen-li Pei(Department of Materials, College of Materials & Metallurgy, Northeastern University), Yu-lan Chen(Department of Materials, College of Materials & Metallurgy, Northeastern University), Hong-cai Yang-(Department of Materials, College of Materials & Metallurgy, Northeastern University)
Abstract
The HDDR (Hydrogenation-Disproportionation-Desorption-Recombination) process is a special method to produce anisotropic NdFeB powders for bonded magnet. The effect of the modified HDDR process on magnetic properties of Nd2Fe14B-based magnet with several composition Nd11.2Fe66.5-xCo15.4B6.8Zr0.1Ga (x=0~1.0) and that of microelement Ga, disproportional temperature and annealing temperature on jHc, grain size were investigated in order to produce anisotropic powder with high magnetic properties. It was found that modified HDDR process is very effective to enhance magnetic properties and to fine grain size. The addition of Ga could change disproportionation character remarkably of the alloy and could improve magnetic properties of magnet powder. Increasing annealing temperature induces significant grain growth. And grain size produced by modified HDDR process is significantly smaller than those produced by conventional HDDR process.
Keywords: Nd_2Fe_14B; Modified HDDR process; Magnet powder; Grain size; Coercivity
DOI:
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