| 摘要 |
PURPOSE:To obtain a composite permanent magnet wherein heat generated by an eddy current is little and its mechanical strength is large by a method wherein a ceramic sheet is pasted between permanent magnets or the part between the permanent magnets is coated with a ceramic. CONSTITUTION:A rare-earth magnet alloy whose magnetic characteristic is excellent is first molded in a magnetic field; after that, it is sintered in an argon atmosphere; it is heat-treated additionally; and a permanent magnet 1 having a central hole 2 is formed. Then, a ceramic material 3 is pasted on permanent magnets 1 via a brazing material; they are united. Alternatively, the part between the permanent magnets 1 is coated with the ceramic material 3; they are united. In addition, this assembly is sintered; a prescribed magnetization operation is executed. Thereby, it is possible to form a composite permanent magnet in which heat generated by an eddy current is little and whose mechanical strength is large. |
