Soft Magnetic Material And Dust Core

• US 20080061264A1
• Filed: 03/09/2006
• Published: 03/13/2008
• Est. Priority Date: 04/15/2005
• Status: Abandoned Application

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Inventors: Toyoda, Haruhisa, Igarashi, Naoto, Maeda, Toru
• Application Number:
  US11/911,657
• Publication Number:
  US 20080061264A1
• Time in Patent Office: Days
• US Class Current: 252/62.51R
• CPC Class Codes: B22F 1/105 containing inorganic lubricating or binding agents, e.g. metal salts
• CPC Class Codes: B22F 1/142 Thermal or thermo-mechanical treatment
• CPC Class Codes: B22F 2003/248 Thermal after-treatment
• CPC Class Codes: B22F 2009/0828 with water
• CPC Class Codes: B22F 2201/10 Inert gases
• CPC Class Codes: B22F 2202/17 use of centrifugal or vortex forces
• CPC Class Codes: B22F 2998/10 Processes characterised by the sequence of their steps
• CPC Class Codes: B22F 2999/00 Aspects linked to processes or compositions used in powder metallurgy
• CPC Class Codes: B22F 9/04 starting from solid material, e.g. by crushing, grinding or milling C22C1/1084 takes precedence; crushing, grinding or milling, in general, see the relevant subclasses, e.g. B02C
• CPC Class Codes: B22F 9/082 atomising using a fluid using centrifugal force B22F9/10
• CPC Class Codes: H01F 1/20 in the form of particles, e.g. powder H01F1/147 takes precedence
• CPC Class Codes: H01F 1/24 the particles being insulated
• CPC Class Codes: H01F 3/08 made from powder powder coatings on sheets H01F3/02; on strips or ribbons H01F3/04; on wires H01F3/06
• CPC Class Codes: H01F 41/0246 Manufacturing of magnetic circuits by moulding or by pressing powder magnetic cores made by moulding or by pressing powder H01F27/255; soft magnetic particles H01F1/20, H01F1/36

Abstract

A soft magnetic material has a plurality of composite magnetic particles. Each of the plurality of composite magnetic particles has a metal magnetic particle and an insulating coating covering the metal magnetic particle. Each of the plurality of composite magnetic particles has a ratio of a maximum diameter to an equivalent circle diameter greater than 1.0 and at most 1.3, and a specific surface area of at least 0.10 m²/g.

Claims

1. A soft magnetic material comprising:

a plurality of composite magnetic particles.

wherein each of the plurality of composite magnetic particles comprises a metal magnetic particle and an insulating coating covering the metal magnetic particle, and

wherein each of the plurality of composite magnetic particles has a ratio of a maximum diameter to an equivalent circle diameter greater than 1.0 and at most 1.3, and a specific surface area of at least 0.10 m²/g.

2. The soft magnetic material according to claim 1, wherein each of the plurality of composite magnetic particles has an average particle diameter in the range of 10 μ

m to 500 μ

m.

3. A dust core produced using the soft magnetic material according to claim 1.

4. A dust core produced using the soft magnetic material according to claim 2.