| 摘要 |
PURPOSE:To make it excellent in magnetic characteristics, to increase mechanical strength, to enable strong joining with other member, and to reduce the cost by applying hot working and heat treatment after melting and casting R-TM-B alloy (rare earth transition metal boron line). CONSTITUTION:Alloy which has at least one kind of R among rare earth elements including Y, transition metals TM and boron B for its main ingredients is melted and casted, and then the cast ingot is hot-worked at the temperature of 500 deg.C or more. Also, after hot-working, it is heat-treated at the temperature of 250 deg.C or higher so as to manufacture a joined substance of a permanent magnet and a soft magnetic substance, and then after-processing such as cutting, etc., is applied so as to leave a part of the soft magnetic substance section as a structure part material or a magnetic circuit. That is, sufficient coercive force can be obtained simply by applying hot-working and heat treatment without going through processes of pulverizing and sintering cast ingot, and production process of the permanent magnet can be reduced sharply. Furthermore, it has magnetic characteristics of about seven times the conventional ferrite magnet and the intensity of the magnet itself is greater than the sintered product, and further solid phase junction between the magnet and other structure material or magnetic circuit is performed. |
