Title:
圧粉磁心およびその製造方法
Document Type and Number:
Japanese Patent JP5140042
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a dust core that satisfies low magnetic permeability, high magnetic-flux density and high strength.SOLUTION: The dust core is composed of a green compact formed by pressing powder for a magnetic core manufactured by executing a first-coating-layer forming step and a second-coating-layer forming step, respectively, in which soft-magnetic powder and a solution of a heat-curable silicone resin are brought into contact with each other and dried, while setting the drying temperature of the second-coating-layer forming step lower than that of the first-coating-layer forming step. The ratio of the second coating layer is set to 40-90 mass%; and by having the density ratio (ρ/ρ:%) that is the ratio of the bulk density (ρ) of a green compact to the true density (ρ) of the soft-magnetic powder set to 85-91%, it is possible to obtain a dust core that satisfies low magnetic permeability, high magnetic-flux density and high strength.
Inventors:
General Otsubo
Masaaki Tani
Takeshi Hattori
Daisuke Okamoto
Sugiyama Masaki
Masaaki Tani
Takeshi Hattori
Daisuke Okamoto
Sugiyama Masaki
Application Number:
JP2009163431A
Publication Date:
February 06, 2013
Filing Date:
July 10, 2009
Export Citation:
Assignee:
Toyota Central R & D Labs.
TOYOTA JIDOSHA KABUSHIKI KAISHA
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
H01F1/26; B22F1/00; B22F1/02; B22F3/00; B22F3/02; B22F3/24; H01F27/255; H01F41/02; C22C38/00
Domestic Patent References:
| JP7254522A | ||||
| JP2005217289A | ||||
| JP2006202956A | ||||
| JP2008270539A |
Attorney, Agent or Firm:
Hiroshi Okawa
Previous Patent: JPS5140041
Next Patent: TERPHENYL DERIVATIVE, LIQUID CRYSTAL COMPOSITION CONTAINING THE SAME DERIVATIVE AND LIQUID CRYSTAL E...
Next Patent: TERPHENYL DERIVATIVE, LIQUID CRYSTAL COMPOSITION CONTAINING THE SAME DERIVATIVE AND LIQUID CRYSTAL E...