Anisotropic Nd_2Fe_(14)B-Based Magnet Powders with High Energy Product Fabricated by HDDR Process

摘要

The hydrogenation-disproportionation-desorption-recombination (HDDR) process is the method to produce anisotropic iron-based rare earth magnet powders for bonded magnet. The magnetic properties and anisotropy of HDDR permanent magnetic powders fabricated from the alloys with a nominal composition of Nd_(13)Fe_(63.3-x)Co_(17)B_(6.6)Zr_(0.1)Ga_x(x = 0.1-1.0) have been investigated. The results show that HD and DR process affects the magnetic properties and anisotropy obviously. The effect of alloy element Ga content on the magnetic properties and anisotropy of the HDDR magnet powders was studied. The results show that degree of alignment(DOA) = 0.563, iHc=817.6 kA/m, Br=1.18T and (BH)max=244KJ/m~3 for Nd_(13)Fe_(62.3)CO_(17)B_(6.6)Zr_(0.1)Ga_(1.0) magnet powders.