Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
DUST CORE AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2011/118774
Kind Code:
A1
Abstract:
Disclosed is a dust core that has low core loss and excellent constant magnetic permeability, and is favorable as the core of a vehicle-mounted inductor. The dust core is a powder compact of a mixed powder containing: an iron-based soft magnetic powder having an electrically insulating coating on the surface; and the powder of a substance having low magnetic permeability of which the heat resistance temperature is at least 700°C and the relative permeability is no greater than 1.0000004. The density of the powder compact is at least 6.7 Mg/m3, and the substance having low magnetic permeability is present in the gaps between the soft magnetic powder in the powder compact.

Inventors:
INAGAKI TAKASHI (JP)
ISHIHARA CHIO (JP)
Application Number:
PCT/JP2011/057363
Publication Date:
September 29, 2011
Filing Date:
March 25, 2011
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
HITACHI POWDERED METALS (JP)
INAGAKI TAKASHI (JP)
ISHIHARA CHIO (JP)
International Classes:
H01F1/24; B22F1/16; B22F3/00; H01F1/33; H01F27/24; H01F27/255; H01F41/02
Domestic Patent References:
WO2009075173A12009-06-18
Foreign References:
JP2009302165A2009-12-24
JP2003217919A2003-07-31
JP2009120915A2009-06-04
JPH09320830A1997-12-12
JP2000235925A2000-08-29
Other References:
See also references of EP 2555210A4
Attorney, Agent or Firm:
MIYOSHI, Hidekazu et al. (JP)
Hidekazu Miyoshi (JP)
Download PDF:
Claims: