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:
Dec. 04, 2012
Filed:
Nov. 22, 2011
Takeshi Ohwaki, Kobe, JP;
Hiroyuki Mitani, Kobe, JP;
Hirofumi Hojo, Takasago, JP;
Tomotsuna Kamijo, Takasago, JP;
Takeshi Ohwaki, Kobe, JP;
Hiroyuki Mitani, Kobe, JP;
Hirofumi Hojo, Takasago, JP;
Tomotsuna Kamijo, Takasago, JP;
Kobe Steel, Ltd., Kobe-shi, JP;
Abstract
Provided is a dust core excellent in flux density, iron loss, and mechanical strength. A production process of a dust core according to the invention includes a step of compacting a mixture obtained by mixing an iron-based soft magnetic powder for powder compact having a phosphate conversion coating film on the surface of an iron-based soft magnetic powder with a lubricant to obtain a powder compact, a heat treatment step of heating the resulting powder compact at 550° C. or more but not more than 650° C. in an inert atmosphere, and a heat treatment step of heating the heat-treated powder compact at 420° C. or more but not more than 530° C. in an oxidizing atmosphere.