METHOD OF MANUFACTURING RARE EARTH MAGNET ALLOY RIBBON

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PROBLEM TO BE SOLVED : To provide a method of manufacturing a rare earth magnet alloy ribbon of a proper solidification structure capable of revealing an excellent magnetic characteristic, by controlling a molten metal discharge quantity to a rotary roll surface in a rapid solidification process where the rotary roll is used.SOLUTION : The method for manufacturing the rare earth magnet alloy ribbon by the rapid solidification process where the rotary roll is used, comprises a step of preparing rare earth magnet alloy molten metal in a nozzle opposed to the rotary roll, a step of impressing discharge pressure to the rare earth magnet alloy molten metal in the nozzle and a step of reducing the discharge pressure up to a value required for a discharge continuation from a value when starting discharge in a moment when the rare earth magnet alloy molten metal starts discharge from the nozzle. Desirably, the discharge pressure applied to a molten metal surface in the nozzle, is increased from the discharge continuation pressure in accordance with reduction in a molten metal quantity in the nozzle.COPYRIGHT : (C)2014, JPO&INPIT