To provide highly insulative magnetic powder suitable for an electric wave absorber for which a soft magnetic ferroalloy is used.
The magnetic powder is composed of complex grains made by bonding ferrite grains 2 having an average grain diameter of 5 μm or less around the surface of soft magnetic ferroalloy grains 1 having an average diameter of 100 μm or less, and an aspect ratio of 5 or more via an organic or nonorganic binder 3. The magnetic powder contains a soft ferrite of 40 to 80 pts.mass against a soft magnetic ferroalloy of 100 pts.mass. The soft magnetic ferroalloy for preferable use is composed of Si of 4 to 13 mass%, Al of 4 to 7 mass%, and Fe virtually having the rest of mass%, or is composed of Si of 3 to 7 mass% and Fe virtually having the rest of mass%.
SUENAGA SHINICHI
SHIGEMATSU ISAO
TSUBOI ZEN
DOWA F TEC CO LTD
| JP2003197415A | 2003-07-11 | |||
| JP2003347787A | 2003-12-05 | |||
| JP2002344192A | 2002-11-29 |
Kenji Wada