| 简介 |
PROBLEM TO BE SOLVED : To provide a process for producing a rare earth permanent magnet in which even a smaller quantity of lubricant added can exhibit the effect as a lubricant sufficiently.
SOLUTION : The process for producing an R-T-B (R : one kind or more than one kind of rare earth elements, T : Co and/or Fe, B : boron) based rare earth permanent magnet comprises a step for pulverizing a material alloy roughly, a step for adding first lubricant to roughly pulverized powder produced in the rough pulverization step, a step for pulverizing the roughly pulverized powder added with lubricant finely, a step for adding second lubricant to finely pulverized powder produced in the fine pulverization step and stirring it in a temperature zone between 30°C and Tm (Tm is the lowest temperature of melting points of first and second lubricants), a step for shaping the finely pulverized powder passed through the mixing step in a magnetic field, and a step for sintering the compact obtained in the shaping step.
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