METHOD FOR PRODUCING RAW MATERIAL ALLOY FOR NANOCOMPOSITE MAGNET, NANOCOMPOSITE MAGNET POWDER AND METHOD FOR PRODUCING MAGNET

摘要

PROBLEM TO BE SOLVED: To provide a raw material alloy (powder) for a nanocomposite magnet generating less recrystallization heat and efficiently producing magnet powders having a fine and homogeneous metallic structure with high reproducibility, and to provide its production method. SOLUTION: At the time of producing a raw material alloy for a nanocomposite magnet expressed by Fe100-x-yRxBy or the like; wherein R is rare earth elements containing either or both elements of Pr and Nd by >=90 atomic%, and the balance one or more kinds of elements selected from the other lanthanoide series elements and Y by 0 to <10% and satisfying the compositional ratios of 2<=x<=6, and 15<=y<=25, a stage in which the molten metal 21 of the above raw material alloy is rapidly solidified by a single roll method 7 is included. In the rapid solidifying stage, the operations in a dissolving chamber 1 and a rapid cooling chamber 2 are performed in the pressure reducing atmosphere to improve the adhesion between the molten metal and a cooling roll, by which a rapidly solidified alloy in a stage of being uniform metallic glass is produced.