Rare earth magnets and method of producing same

Details Rare earth magnets and method of producing same Rare earth magnets and method of producing same

1991-12-04

1993-04-13

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

419 12, 419 29, 148101, H01F 102

Patent

active

052019632

ABSTRACT:
Rare earth magnets comprising 12 to 20 at % R (where R denotes rare earth elements including at least one selected from neodymium and praseodymium) and 2 to 10 at % boron, with the remainder being TM (where TM=Fe.sub.1-x Co.sub.x (0.ltoreq.x.ltoreq.0.4)) and unavoidable impurities, wherein 50 to 100 vol % of the magnet is formed of recrystallization grains of R.sub.2 Fe.sub.14 B intermetallic compound having a tetragonal crystal structure with an average grain size of 1 to 100 .mu.m and an induced anisotropy P of 0.1 or more (where P=(Br(.parallel.)-Br(.perp.))/(Br(.parallel.)+Br(.perp.)), Br(.parallel.) being residual magnetic flux density along the easy magnetization axis and Br(.perp.) being residual magnetic flux density perpendicular to the easy magnetization axis), and the method of producing the rare earth magnets.

REFERENCES:
patent: 4756775 (1988-07-01), Croat
patent: 4792367 (1988-12-01), Lee
patent: 4981532 (1991-01-01), Takeshita et al.
patent: 4985086 (1991-01-01), Iwasaki et al.
patent: 4995905 (1991-02-01), Sagawa
Lee, Appl. Phys. Lett. 46(8), p. 790-791 (1985).
Nozawa et al., J. Appl. Phys. 64(10), pp. 5285-5289 (1988).

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