Method for making injection molded soft magnetic material

Details Method for making injection molded soft magnetic material Method for making injection molded soft magnetic material

1992-07-15

1994-02-08

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

419 30, 419 31, 419 32, 419 33, 419 36, 419 38, 419 39, 419 40, 419 44, 419 23, 75235, 75243, B22F 316

Patent

active

052846156

ABSTRACT:
The present invention presents a method of processing ferrous powder materials to produce small component parts exhibiting excellent soft magnetic properties, in particular, residual magnetic flux density. The processing steps involve, in part, mixing with a binder, dewaxing or presintering at a temperature higher than in the conventional dewaxing process, followed by final sintering and a further conversion sintering, at a temperature lower than in the conventional sintering process, to produce parts having density values of over 96% theoretical density and excellent soft magnetic properties. The invented method is suitable for producing small component parts having sufficient strength and excellent soft magnetic properties to make them suitable for miniaturized electrical and electronic equipment.

REFERENCES:
patent: 4964907 (1990-10-01), Kiyota et al.
patent: 5002728 (1991-03-01), Achikita et al.
patent: 5032355 (1991-07-01), Achikita et al.
patent: 5055128 (1991-10-01), Kiyota et al.
patent: 5067979 (1991-11-01), Kiyota et al.
patent: 5098648 (1992-03-01), Kiyota et al.

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