Rare-earth bonded magnet, material and method for manufacturing

Details Rare-earth bonded magnet, material and method for manufacturing Rare-earth bonded magnet, material and method for manufacturing

1994-01-03

1995-02-28

Willis, Jr., Prince

Compositions

Magnetic

With wax, bitumen, resin, or gum

252 6253, 252 6251, 252 6257, 252 6258, 428402, 428403, 428407, 428900, H01F 1053

Patent

active

053934458

ABSTRACT:
A material for a rare-earth bonded magnet is prepared by coating a rare-earth magnetic powder with a heat resisting addition polymerizable thermosetting resin consisting essentially of a monomer or polymer of 2,2-bis(cyanatophenyl) propane in an amount of not more than 2 wt % based on the weight of the magnetic powder. The oxidation of the rare-earth magnetic powder is thereby prevented or retarded by triazine rings formed in the coating film of the heat resisting addition polymerizable thermosetting resin. A rare-earth bonded magnet having improved heat resistance is prepared by agglomerating the coated rare-earth magnetic powder with a binder. The heat resistance of the bonded magnet is further improved by curing the heat resisting addition polymerizable thermosetting resin in a vacuum and by adding an organometallic salt as a metallic catalyst, to thereby improve the integrity of the coating film.

REFERENCES:
patent: 2904875 (1959-09-01), Trigg et al.
patent: 4973415 (1990-11-01), Ohmachi et al.
patent: 5176842 (1993-01-01), Kuwazawa et al.
Patent Abstracts of Japan, vol. 13, No. 354 (E-802) 8 Aug. 1989.
Patent Abstracts of Japan, vol. 14, No. 344 (E-0955) 25 Jul. 1990.
Patent Abstracts of Japan, vol. 14, No. 134 (C-0701) 14 Mar. 1990.

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