Lower oxidation of powder and smaller powder particle size are effective for improving the performance of a rare-earth magnet.
为了实现稀土类磁体的高性能化，有效的是减少粉末的氧化，缩小粉末的粒径。
The magnetic materials comprise resin and magnetic powder, wherein the average particle size of the magnetic powder is smaller than 20 microns.
磁性材料包括一树脂与一磁性粉末，其中磁性粉末的平均粒径小于20微米。
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