| 简介 |
FIELD : physics.
SUBSTANCE : first step for adhering at least one of Dy and Tb to at least part of the surface of a sintered magnet based on iron-boron-rare-earth element is carried out; and a second step is carried out for diffusion of at least one of Dy and Tb adhered to the surface of the sintered magnet into a crystalline grain-boundary phase of the sintered magnet via thermal treatment at defined temperature. The sintered magnet used is a magnet made by mixing powder of a principal phase alloy, mainly consisting of the R2T14B phase, where R is at least one rare-earth element, mainly consisting of Nd, and where T is a transition metal, mainly consisting of Fe and powder of a liquid phase alloy, having higher content of R than the R2T14B phase, and mainly consisting of a phase rich in R, in given ratio of mixing, pressing the obtained mixed powder in a magnetic field and then sintering the pressed body in a vacuum or atmosphere of an inert gas.
EFFECT : high coercitive force and good magnetic properties with high efficiency.
10 cl, 6 dwg, 2 ex |
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