Bonded high energy rare earth permanent magnets

Details Bonded high energy rare earth permanent magnets Bonded high energy rare earth permanent magnets

1987-02-25

1989-10-10

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

264108, 252 6254, H01F 702

Patent

active

048735043

ABSTRACT:
A permanently magnetizable composite is made from rare earth permanent magnet material by incorporating coarse particles of the material into a workable binder at a gradual rate such that sparking and combustion are avoided, until the particles are coated with or embedded in the binder, and then working the mixture under shearing forces sufficient to break up the particles in situ, thereby forming much finer particles directly within the binder. Extremely high particle packing fractions can be obtained in this manner, yet the residual induction of even an isotropic composite substantially exceeds the maximum that would be expected for a magnet having that packing fraction.

REFERENCES:
patent: 2999275 (1961-09-01), Blume, Jr.
patent: 3141050 (1964-07-01), Blume, Jr.
patent: 3246060 (1966-04-01), Blume, Jr.
patent: 4496395 (1985-01-01), Croat
patent: 4689163 (1987-08-01), Yamashita et al.
patent: 4702852 (1987-10-01), Sakauchi et al.
Article by R. W. Lee, E. G. Brewer and N. A. Schaffel titled "Processing of Neodymium-Iron-Boron Melt-Spun Ribbons to Fully Dense Magnets"--IEEE Transactions on Magnetics, vol. Mag. 21, No. 5, Sep. 1985.
Brochure entitled "Magnetquench MQ Powder" by Magnetic Products, Delco Remy Div. of General Motors.

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