A method of manufacturing a rare earth permanent magnet and mixing of the raw material powder and me

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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. ŽSOLUTION : 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 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 stirring the mixture of finely pulverized powder and lubricant produced in the fine pulverization step in a temperature zone between 30°C and melting point of the lubricant, 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. ŽCOPYRIGHT : (C)2007, JPO&INPIT Ž