| 简介 |
PROBLEM TO BE SOLVED : To improve the strength of a molded body without deteriorating the magnetic characteristics of the body.SOLUTION : At the time of manufacturing a sintered rare-earth magnet by sintering fine raw alloy powder containing a rare-earth element, a transition metal element, and boron, the fine raw alloy powder is molded by adding shapeless fine particles to the powder and the molded body is sintered. The shapes of the shapeless fine particles are not able to be expressed indiscriminately, because the fine particles contain various shapes of particles. The particle size distribution of the fine particles can be used as the index of the shapelessness. The particle size distribution has two or more peaks. The shapeless fine particles include metallic powder of Al etc., fluorine plastic powder, metallic soap powder, fatty amide powder, etc. |
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