Anisotropic rare earth-Fe-B system and rare earth-Fe-Co-B system magnet
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United States of America Patent
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Mar 7, 1995
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app pub date -
Feb 23, 1993
filing date -
Jan 28, 1991
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Abstract
A hot press molded body or an HIP molded body having one of a composition comprising R: 10-20 atomic %, B: 3-20 atomic %, and a total amount of one or a plurality of Ga, Zr, and Hf: 0.001-5.0 atomic %, a remainder comprising Fe and unavoidable impurities; or a composition comprising R: 10-20 atomic %, B: 3-20 atomic %, and a total amount of one or a plurality of Ti, V, Nb, Ta, Al, and Si: 0.001-5.0 atomic %, a remainder comprising Fe and unavoidable impurities; or a composition comprising Co: 0.1-50 atomic % added to one of the above compositions, having an aggregate structure of crystallized grains having as a main phase thereof a R.sub.2 Fe.sub.14 B type or R.sub.2 (Fe, Co).sub.14 B type intermetallic compound having a tetragonal structure, the crystallized grains having dimensions of 0.05-20 .mu.m; and individual crystallized grains comprising more than 50 volume % of the total crystallized grains comprising the aggregate structure, have a value of less than 2 of a ratio b/a of a smallest grain diameter a and a largest grain diameter b.
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