Method for the preparation of rare earth based anisotropic perma

Details Method for the preparation of rare earth based anisotropic perma Method for the preparation of rare earth based anisotropic perma

1998-04-06

1999-11-02

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148121, 164477, C21D 104

Patent

active

059762713

ABSTRACT:
Provided by the invention is a method for the preparation of a magnetically anisotropic permanent magnet mainly consisting of crystallites of the Nd.sub.2 Fe.sub.14 B phase. The method comprises the steps of:(a) preparing an amorphous alloy of neodymium, iron and boron in molar fractions corresponding to the Nd.sub.2 Fe.sub.14 B phase or a nanocomposite of the Nd.sub.2 Fe.sub.14 B/Fe.sub.3 B or Nd.sub.2 Fe.sub.14 B/Fe system, for example, by the melt-spun method; and (b) subjecting the amorphous alloy of neodymium, iron and boron to a heat treatment in a magnetic field of at least 3 T (tesla) at a temperature in the range from 550 to 800.degree. C. for a length of time in the range from 1.times.10.sup.2 to 1.times.10.sup.4 seconds in an atmosphere of a non-reactive gas or vacuum.

REFERENCES:
patent: 4715891 (1987-12-01), Ovshinsky et al.
patent: 4854979 (1989-08-01), Wecker
"The Effect of Magnetic Field Treatment on Enhanced Exchange Coupling of ND2FVE14B/FE3B Magnet"--C.J. Yang, et al--IEEE Transactions of Magnets, vol. 32, No. 5, Sep. 1996, pp. 4428-4430--XP 000634031.
Patent Abstract of Japan, vol. 010, No. 035--Feb. 12 1986 & JP 60 194502A--Suwa Seikosha KK--Oct. 3 1985.
Patent Abstract of Japan, vol. 013, No. 374--Aug. 18 1989 & JP 01 128404A--TDK Corp.--May 22 1989.

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