Method for producing permanent magnet and sintered compact and p

Details Method for producing permanent magnet and sintered compact and p Method for producing permanent magnet and sintered compact and p

1991-12-02

1993-10-05

Nelson, Peter A.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Consolidation of powder prior to sintering

419 38, 419 66, B22F 312

Patent

active

052502554

ABSTRACT:
Green compacts for sintered ceramic bodies and for sintered permanent magnets are produced by first preparing outside a die press machine a mold which contains a rubber portion in at least a side portion. The mold cavity is then filled with the fine powder which is to form the compact to a density which is at least 1.2 times the natural filling density of the powder. The filled rubber mold is then placed in the die press machine and compacted in the die press machine to produce the green compact. The natural filling density is obtained by allowing the powder to fall from a powder pan into the rubber mold until the powder reaches the top of the rubber mold, where the distance from the powder pan to the bottom of the rubber mold is 3.7 times the depth of the cavity of the rubber mold.

REFERENCES:
patent: 3038199 (1962-06-01), Bartow et al.
patent: 3189667 (1965-06-01), Buttner et al.
patent: 3469283 (1969-09-01), Vinson
patent: 3571854 (1971-03-01), Lundstrom
patent: 3650646 (1972-03-01), Kirkpatrick
patent: 3897532 (1975-07-01), Lyssy
patent: 4808224 (1989-02-01), Anderson et al.
patent: 4869869 (1989-09-01), Anderson et al.
patent: 5080731 (1992-01-01), Tabaru et al.
English abstract of Japanese Unexamined Patent Application (kokai) No. 56-119699, published Sep. 19, 1981.

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