Method for producing a soft magnetic material

Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C148S122000

Reexamination Certificate

active

10687894

ABSTRACT:
The invention provides a method for preparing a soft magnetic material which meets demands for low iron loss, high density, high strength and high productivity. The method comprises a surface oxidation step of forming oxide films on the surfaces of a soft magnetic powder, a step of preparing a molding compound of the soft magnetic powder by mixing a soft magnetic powder and a binder with a predetermined blending ratio, a press molding step of press-molding the molding compound of the soft magnetic powder into a predetermined shape, and a sintering step of sintering the press-molded soft magnetic powder to produce a soft magnetic material, wherein a millimeter wave sintering apparatus or a discharge plasma sintering apparatus is used as a heating means in the surface oxidation step or in the sintering step. Thereby, energy of millimeter waves or discharge plasma acts locally on oxidized surface portions having a large electric resistance of the soft magnetic powder, the surfaces of the soft magnetic powder are locally heated at a temperature near the melting point, and oxidation of the surfaces of the soft magnetic powder (formation of an oxide film) and sintering (diffusional joining between oxide films) are promoted.

REFERENCES:
patent: 5302306 (1994-04-01), Nagata et al.
patent: 5348800 (1994-09-01), Moro et al.
patent: 4-202645 (1992-07-01), None
patent: 5-36514 (1993-02-01), None
patent: 5-47541 (1993-02-01), None
patent: A-5-109520 (1993-04-01), None
patent: A-7-135106 (1995-05-01), None
patent: 8-264361 (1996-10-01), None
Machine translation of Japanese Patent Document No. 05-036514.
Japanese Office Action dated Jul. 4, 2006 in corresponding Japanese application No. 2003-312303.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method for producing a soft magnetic material does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for producing a soft magnetic material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for producing a soft magnetic material will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3819318

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.