| 摘要 |
PURPOSE:To restrain an iron.rare earth nitride magnet from being split in phase by a method wherein nitrified iron.rare earth alloy powder is put into a molding die and compressed, and a voltage is applied to alloy powder to heat and sinter. CONSTITUTION:In a molding die 1, iron.rare earth nitride powder 9 is put into a recess formed of a spacer 5, a side wall board 6, and an upper base wall board 2. After the powder 9 is put into a recess provided to the molding die 1, a punch is set, and a pulse magnetic field is applied. In succession, a voltage is applied between electrodes 4 and 4 as the powder 9 is uniaxially compressed in a vertical direction. At this point, the powder 9 is heated by resistance heating, electric power of 60J/sec or more is given to per g of powder for 15 seconds or below. By this manufacturing process, powder is sintered in a short time and restrained from being split in phase due to heating, so that an iron.rare earth nitride magnet can be manufactured by sintering without deteriorating in magnet characteristics. |
