Anisotropic rare earth-Fe-B system and rare earth-Fe-Co-B system

Details Anisotropic rare earth-Fe-B system and rare earth-Fe-Co-B system Anisotropic rare earth-Fe-B system and rare earth-Fe-Co-B system

1993-02-23

1995-03-07

Sheehan, John P.

Metal treatment

Stock

Magnetic

75244, H01F 104

Patent

active

053954629

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.

REFERENCES:
patent: 4981532 (1991-01-01), Takeshita et al.
patent: 5228930 (1993-07-01), Nakayama et al.
Patent Abstracts of Japan, vol. 12, No. 500 Dec. 27, 1988 & JP-63 211 706 Sep. 2, 1988.
R. K. Mishra, Journal of Applied Physics, vol. 61, No. 8, Apr. 15, 1987, p. 3778, paragraph 2.
Patent Abstracts of Japan, vol. 14, No. 12 Jan. 11, 1989 & JP-12 57 308 Oct. 13, 1989.
Patent Abstracts of Japan, vol. 13, No. 292 Jul. 6, 1989 & JP-10 73 602 Mar. 17, 1989.

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