| 摘要 |
PURPOSE:To miniaturize an electromagnetic instrument by spinning molten magnetic material, heat-treating and forming fiber having the specific diameter, coercive force and the prescribed square loop ratio under DC magnetized condition. CONSTITUTION:The magnetic material composing of Fe-Si based alloy, etc., is melted and injected into cooling liquid layer 8 from a nozzle 2 having <=100mum the diameter in rotating liquid spinning apparatus, etc. Then, the molten magnetic material is wound in a rotating drum 6 as fine wire 4 and the fiber forming primary arm of dendritic crystal having all the same angle within 20 deg. to the axial direction is formed. Successively, interval strain of the fiber in this dendritic structure is removed to eliminate the dendritic structure, and the soft magnetic fiber is obtd. By this method, the fiber having <=100mum the diameter, <=0.3 oersted the coercive force and <=0.9 the square loop ratio under DC magnetized condition is formed. Therefore, the electromagnetic instrument using this fiber is drastically miniaturized. |
