Methods for preparing magnetic powder material and magnet, proce

Details Methods for preparing magnetic powder material and magnet, proce Methods for preparing magnetic powder material and magnet, proce

1993-08-04

1994-09-27

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

419 36, 4272133, 42721331, 252 6254, B22F 100, B01J 1302, B05D 700

Patent

active

053505581

ABSTRACT:
There is disclosed a process for preparing a resin composition for powder molding, comprising 50 to 97 wt % of a metal or alloy powder and 50 to 3 wt % of a thermoplastic resin having heat resistance and crystallinity, which process comprises dissolving the thermoplastic resin having heat resistance crystallinity in a solvent and at the same time, dispersing therein at least one metal or alloy powder selected from iron, brass, nickel silver, stainless steel and aluminum, having an average particle diameter of not more than 500 .mu.m to thereby prepare a mixture. In addition, there is disclosed a process for producing a powder molded product which comprises cold compressing molding the above resin composition and then heating the molding at a temperature not less than the melting point of the thermoplastic resin. This powder molded product has excellent dimensional stability against heat, chemical resistance, and mechanical strength.

REFERENCES:
patent: 3451934 (1968-06-01), Hubbard
patent: 3650814 (1972-03-01), Elder, Jr.
patent: 4401482 (1983-08-01), Green
patent: 4812507 (1989-03-01), Matsuo et al.
patent: 5164104 (1992-11-01), Kobayashi

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