| 摘要 |
PURPOSE: To provide a magnet, which has high magnetic flux density and superior magnetizability and has high reliability, particular heat resistance (thermal stability). CONSTITUTION: Magnet powder is composed of an alloy composition expressed by Rx(Fe1-yCoy)100-x-z-wBzAlw (where R, x, and y respectively represent at least one kind of rare-earth element, 8.1-9.4 at.%, and 0-0.30 at.% and z and w respectively represent 4.6-6.8 at.% and 0.02-1.5 at.%) and has a nanocomposite texture, in which soft magnetic phases and hard magnetic phases coexist adjacently. When an isotropically bonded magnet is manufactured by molding a mixture of the magnet powder and a binder resin, the irreversible magnetic susceptibility (χirr=χdif-χrev) of the magnet measured starting from an intersection P of the demagnetization curve shown in the J-H graph which shows the magnetic characteristic of the magnet at room temperature with the straight line (y), passing through the origin of the graph and having a slope (J/H) of -3.8x10-6 henry/m becomes 5.0x10-7 henry/m or smaller and moreover the characteristic coercive force (HcJ) of the magnet at room temperature becomes 406-717 kA/m.
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