PERMANENT MAGNET AND METHOD OF MAKING SAID MAGNET Russian patent published in 2011 - IPC H01F41/02 H01F1/57 H01F1/08 B22F3/24 

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