EINSATZPULVER FÜR R-FE-B MAGNET UND VERFAHREN ZUR HERSTELLUNG EINES SOLCHEN MAGNETEN

摘要

It is an object of the present invention to provide a method for manufacturing a raw material alloy powder that can be utilized effectively in the regeneration of surplus or defective R-Fe-B type sintered magnets while leaving the main phase crystal grains alone, and a method for manufacturing an R-Fe-B type magnet. Surplus or defective R-Fe-B type sintered magnets are pulverized, acid washed, and dried, after which this product is subjected to a calcium reduction treatment and washed to remove the calcium component, which allows a raw material alloy powder composed of an Nd2Fe14B main phase system, which contributes the most to magnet characteristics, to be regenerated efficiently. An alloy powder for compositional adjustment that improves sintering and adjusts the composition is added to this main phase system raw material alloy powder to produce a sintered magnet, which facilitates the manufacture of a sintered magnet with superior magnet characteristics.