The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 19, 2016
Filed:
Apr. 28, 2010
Yasuo Oshima, Tokyo, JP;
Susumu Handa, Tokyo, JP;
Kota Akaiwa, Tokyo, JP;
Tamura Corporation, Tokyo, JP;
Abstract
Provided is a dust core and a method for manufacturing a thereof, having an effect that the soft magnetic powder is prevented from sintering and bonding together upon heating, the hysteresis loss can be effectively reduced, and the DC B-H characteristics is excellent. In a first mixing process, a soft magnetic powder composed mainly of iron and an inorganic insulating powder of 0.4 wt %-1.5 wt % are mixed by a mixer. A mixture obtained in the first mixing process is heated in a non-oxidizing atmosphere at 1000° C. or more and below a sintering temperature of the soft magnetic powder. In a binder addition process, a silane coupling agent of 0.1-0.5 wt % is added. A binder, e.g. a silicone resin of 0.5-2.0 wt % is added to the soft magnetic alloy powder to which the inorganic insulating powder is attached by the silane coupling agent, and the soft magnetic alloy powders are bonded to each other so as to be granulated. Then, the mixture is added with a lubricant resin and compression-molded so as to form a green compact. In an annealing process, the mold is annealed in a non-oxidizing atmosphere.