METHOD OF MAKING PERMANENT MAGNET AND PERMANENT MAGNET Russian patent published in 2013 - IPC H01F41/02 H01F1/53 H01F1/08 B22F3/24 

FIELD: physics.

SUBSTANCE: invention relates to a method of making a permanent magnet, which involves: placing evaporating metallic material (v), which contains at least one of dysprosium and terbium, and a sintered magnet (S) into a treatment box; placing said treatment box into a vacuum chamber; heating the treatment box to a given temperature in a rarefied atmosphere to evaporate the evaporating metallic material and depositing vapour onto the sintered magnet; and a step for diffusing the deposited dysprosium and/or terbium metal atoms into the boundaries of crystal grains and/or the boundary phase of crystal grains of the sintered magnet to obtain a high-performance magnet. Even if the sintered magnet is placed near the evaporating metallic material, the present method ensures increase or restoration of magnetisation force or coercitive force, which is very desirable during mass production of permanent magnets. During the period over which the evaporating metallic material evaporates, an inert gas is fed into the working chamber (70) in which the sintered magnet is placed, and before feeding the inert gas, pressure in the working chamber is maintained at about 0.1 Pa or less.

EFFECT: improved method.

9 cl, 12 dwg