| 摘要 |
PROBLEM TO BE SOLVED: To provide an isotropic bonded magnet, which is high in a magnetic flux density, is excellent in a magnetizing property, and is high in a reliability, specially a heat resistance (thermal stability), and a corrosion resistance. SOLUTION: This magnet powder consists of an alloy composition, which is shown by an Rx(Fe1-yCoy)100-x-z-wBzSiw (where R is at least one kind of a rare-earth element, x: 8.1 to 9.4 atomic %, y: 0 to 0.30 atomic %, z: 4.6 to 6.8 atomic % and w: 0.2 to 3 atomic %), and is magnet powder which is constituted of a composite organization having a soft magnetic phase and a hard magnetic phase. Here, when the powder is mixed with a bonded resin, the mixture is molded and the molded material is formed as an isotropic bonded magnet, in a demagnetization curve on a J-H diagram to show the magnetic characteristics of the magnet at room temperatures. An irreversible magnetic susceptibility (χirr=χdif-χrev) of the magnet in the case where the magnet is measured using the intersection point P with a straight line (y), which passes an origin in this J-H diagram and has an inclination (J/H) of -3.8×10-6 Henry/ m, as a starting point is 5.0×10-7 Henry/m or lower. Moreover, the intrinsic coercive force (HcJ) of the magnet at room temperature is 406 to 717 kA/m. |
