Anisotropic rare-earth permanent magnets and method for making s

Details Anisotropic rare-earth permanent magnets and method for making s Anisotropic rare-earth permanent magnets and method for making s

1992-12-03

1994-08-16

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148104, 419 6, 419 66, 419 68, 419 38, 419 45, 419 57, H01F 102

Patent

active

053383729

ABSTRACT:
Anisotropic rare-earth permanent magnets characterized in that an aggregate of a plurality of blocks, to each of which anisotropy is imparted, is formed using powders of magnetic material containing rare-earth elements, and the adjoining blocks are powder-metallurgically bonded together under pressure into one piece; a method of making anisotropic rare-earth permanent magnets by molding anisotropic blocks by magnetic-field molding, arranging, aggregating and sealing a plurality of blocks in a bag, and cold hydrostatic pressing the aggregate of blocks in the absence of magnetic field; and a suitable metal mold for magnetic-field molding anisotropic permanent magnets of a relatively large size.

REFERENCES:
patent: 4123297 (1978-10-01), Jandeska et al.
patent: 4722824 (1988-02-01), Wiech
patent: 4818305 (1989-04-01), Steingroever
Asaka et al., "Diffusion Bonding Method to Assemble Green Compacts During Sintering" Metal Powder Report, Jun. 1984 vol. 39, No. 6; pp. 347-350.

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