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1、γ-Fe_2O_3磁粉的处理方法特开昭58-103106。在减压下加热处理含磷γ-Fe_2O_3磁粉时,压力一般在100T0rr以下,最好在10Torr以下,温度范围在300～450℃之间,处理时间为0.5～5小时。这样处理后的γ-Fe_2O_3磁粉,具有良好的磁特性。如果再包敷一层钴化合物,不仅能提高矫顽力,而且还能增加矫顽力的稳定性,扩大应用范围。用这种磁粉制成磁带后,其矫顽力为402奥斯特,矩形比为0.829,0·R为2.18.剩磁
1, γ-Fe 2 O 3 magnetic powder processing method disclosed in Japanese Patent Application No. 58-103106. When the phosphorus-containing γ-Fe 2 O 3 magnetic powder is heat-treated under reduced pressure, the pressure is generally 100 Torr or less, preferably 10 Torr or less, the temperature is in the range of 300 to 450 ° C., and the treatment time is 0.5 to 5 hours. The treated γ-Fe 2 O 3 magnetic powder has good magnetic properties. If coated with a layer of cobalt compound, not only can improve coercivity, but also increase the stability of coercivity and expand the scope of application. After the magnetic tape was made from this magnetic powder, its coercive force was 402 Oe, the squareness ratio was 0.829, and the R was 2.18.