| 简介 |
PROBLEM TO BE SOLVED : To provide a manufacturing method of a rare earth sintered magnet suppressing the amount of a lubricant added to the utmost and obtaining a compact with high strength and a sintered magnet with high magnetic characteristics, and a method of pulverizing raw alloy powder for the sintered magnet.
SOLUTION : In manufacturing the rare earth sintered magnet, a lubricant is pulverized so that the particle size of the lubricant may be ≤1.5 times of the particle size of raw alloy powder to obtain lubricant particles. Then, it is added to the raw alloy powder and pulverized to obtain finely pulverized powder. Then, this finely pulverized powder is formed in a magnetic field to form a compact. This compact is sintered to obtain the rare earth sintered magnet. When adding the lubricant particles having a particle size of a prescribed size with respect to the particle size of the raw alloy powder to the raw alloy powder and pulverizing it like this, the lubricant is dispersed more uniformly. Thus, pulverization property of raw alloy in a pulverization process and orientation of the pulverized powder are improved.
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