| 摘要 |
PURPOSE:To manufacture the magnet of high coercive force having improved degree of orientation by a method wherein a molding in magnetic field is performed when the coercive force before an aging treatment is 6 kOe or below using 2-17 rare-earth magnet powder, and an aging treatment is performed. CONSTITUTION:Samarium cobalt Sm2Co17 alloy of 1000mum in average grain diameter is pulverized into the average grain diameter of 4 mum using a jet mill, and the powder is molded in a magnetic field. This sintered body of raw material is pulverized using a jaw crusher, and the magnet powder of 200 mum in average grain diameter is obtained by sifting it out. Then, a molding opera tion is performed by having the intensity of orientational magnetic field of 6 kOe or below by a magnetic field molding machine without using an auxiliary molding agent. Then, an aging treatment is performed on the magnet powder at 800 deg.C in vacuum atmosphere for an hour. Lastly, epoxy resin is impregnated therein under vacuum, an after cure is performed at 120 deg.C for an hour, and a bonded magnet integrally formed with resin can be manufactured. |
