Excellent magnetic anisotropy of rare earth magnetic powder manufacturing method

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PROBLEM TO BE SOLVED : To provide a process for producing rare earth magnet powder exhibiting excellent magnetic anisotropy. SOLUTION : Rear earth magnet alloy material is subjected to hydrogen absorption processing for raising the temperature from room temperature to a temperature lower than 500°C in hydrogen gas atmosphere under pressure of 10-1000 kPa or raising and holding the temperature, subjected to hydrogen absorbing/decomposing processing for raising the temperature to a level in the range of 500-1000°C in hydrogen gas atmosphere under pressure of 10-1000 kPa and holding that temperature, subjected to intermediate low pressure heat treatment for holding that material in hydrogen atmosphere under pressure of 2-600 kPa at a temperature in the range of 500-1000°C, subjected to heat treatment, as required, in hydrogen atmosphere under pressure of 0.65-13 kPa lower than that of intermediate low pressure heat treatment, and subjected to dehydrogenation processing for accelerating phase transformation by holding that material in vacuum atmosphere of 0.13 kPa or below at a temperature in the range of 500-1000°C, thereby discharging hydrogen forcibly from the rear earth magnet alloy material. Then that material is cooled and pulverized. COPYRIGHT : (C)2004, JPO&NCIPI