METHOD OF MANUFACTURING OXIDE PERMANENT MAGNET

摘要

PURPOSE:To provide an oxide permanent magnet with stable magnetic characteristics with respect to change of the amount of additives and the sintering temperature. CONSTITUTION:After mill scale produced in iron hot rolling is pulverized to a mean particle size 10mum or less without oxidizing it, it is oxidized at 500 deg.C or more, and then the mill scale having the mean particle size 2mum or less or a particle distribution 1mum or less is pulverized to 20 or 70 volume % to obtain iron oxide for ferrite. It is mixed with an additive composed of either one or both of strontium carbonate or barium carbonate so that the mol ratio of the composition may be 1:5.0 to 6.0. After 0.1 to 0.5wt.% silicon dioxide is added thereto and mixed it is calcined.