冷間加工を施したFe-Cu新永久磁石材料の研究

概要

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The most important characteristic of permanent magnet is a high coercive force, and the most excellent method we have today for getting the high coercive force is to prepare the very fine ferromagnetic particles. Particularly, the particle with anistropy arising from particle shape is of great interest. In this paper, we show a few remarkable examples of fine particle magnets as well as Fe-Cu alloy which we have studied successfully. As the result of our experimental study which we have reported in the previous paper, Fe-Cu alloy has excellent magnetic properties not only as a semi-hard magnet but also as a permanent magnet, if we control the alloy composition, cold drawing and heat treatment. Here, the increase of coercive force by heat treatment is investigated in detail as well as general magnetic properties. And it becomes obvious that copper-clusters precipitate in very fine iron particles by annealing between 300℃〜400℃ and coercive force peak appears when the precipitated copper-clusters grow large enough to prevent the domain wall displacement effectively.
明治大学の論文