FIELD: chemistry.
SUBSTANCE: invention relates to a sintered R-Fe-B based magnet and to a method for production thereof. Sintered R-Fe-B magnet consists mainly of 12–17 at. % Nd, Pr and R, 0.1–3 at. % M1, 0.05–0.5 at. % M2, 4.8 + 2 * m - 5.9 + 2 * m at. % B, and the rest is Fe, containing intermetallic compound R2(Fe,(Co))14B as the main phase and having core/shell structure, in which the main phase is coated with phases of grain boundaries. Sintered magnet has average grain size of less than 6 mcm, crystalline orientation of more than 98 % and magnetization level of more than 96 %.
EFFECT: invention enables to produce sintered magnet with coercive force, at least 10 kOe, in spite of low or zero content of Dy, Tb and Ho.
8 cl, 4 dwg, 4 tbl
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