Rare earth element-Fe-B or rare earth element-Fe-Co-B permanent magnet powder excellent in magnetic anisotropy and corrosion resistivity and bonded magnet manufactured therefrom
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United States of America Patent
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Oct 5, 1993
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N/A
app pub date -
Sep 19, 1991
filing date -
Sep 26, 1990
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Abstract
A R-Fe-B or R-Fe-Co-B permanent magnet powder excellent in magnetic anisotropy and corrosion resistivity, having powder particles. The powder particles each consist essentially of, in atomic percentage: R: 10-20% B: 3-20%; at least one element selected from the group consisting of Ti, V, Nb, Ta, Al, and Si: 0.001-5.0%; and Fe and inevitable impurities: the balance, The R-Fe-Co-B magnet powder further contains 0.1-50% Co. The powder particles each have an aggregated recrystallized structure having a main phase thereof formed by a R.sub.2 Fe.sub.14 B or R.sub.2 (Co,Fe).sub.14 B type intermetallic compound phase having a tetragonal structure. The intermetallic compound phase is formed of recrystallized grains aggregated therein and includes at least 50 volumetric % of recrystallized grains having a ratio b/a smaller than 2 provided that a is designated by the smallest diameter of each of the recrystallized grains, and b is by the largest diameter thereof. The recrystallized grains form the aggregated recrystallized structure having an average grain size within a range of 0.05-20 .mu.m.
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