Patent ID: 6521054
Filing Date: 2003-02-18
Classification: B82Y,H01F

Abstract:
Magnetic powder composed of an alloy composition represented by Rx(Fe1âˆ’yCoy)100âˆ’xâˆ’zâˆ’wâˆ’vBzAlwVv (where R is at least one rare-earth element, x is 7.1-9.9 at %, y is 0-0.30, z is 4.6-6.9 at %, and w is 0.02-1.5 at % and v is 0.2-3.5 at %), the magnetic powder being constituted from a composite structure having a soft magnetic phase and a hard magnetic phase;wherein the magnetic powder has characteristics in which, when an isotropic bonded magnet is molded by mixing the magnet powder with a binding resin, a irreversible susceptibility (xirr) is equal to or less than 5.0Ã—10âˆ’7 H/m; the irreversible susceptibility is measured by using a point where a demagnetization curve in a J-H diagram and a straight line that passes through the origin in the J-H diagram intersect; the demagnetization curve represents the magnetic characteristics at room temperature, and the straight line has a gradient (J/H) of âˆ’3.8Ã—10âˆ’6; and the intrinsic coercive force (HCJ) of the magnet at room temperature is in the range of 320-720 kA/m.