Ca過剰総量がCa-La-Co系フェライト焼結磁石の諸特性に与える影響

抄録

It was reported that excessively added Ca at the timing of raw materials mixing and added CaO before sintering have a close relationship on the magnetic and physical properties of Ca-La-Co ferrite sintered magnets. In this study, the effects of the total amount and the ratio of excessively added Ca at the timing of raw materials mixing and before sintering on the magnetic and physical properties are discussed. The results show that the coercive force at low sintering temperature and the magnetization of sintered samples at the same density decrease with an increase the Ca excess total amount. Moreover, the magnetization at the same density decrease, and the density of sintered samples at same sintering temperature gradually increase with an increase excessively added Ca at the timing of raw materials mixing.