| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a carrier core material for an electrophotographic developer which has high resistance and high magnetization at a ferrite composition of manganese base and a manufacturing method of a carrier. <P>SOLUTION: There is provided a manufacturing method of a ferrite core material for an electrophotographic developer expressed by the following general formula in which material is pulverized and mixed, then temporarily burned, the product obtained after temporary burning is then pulverized to be slurry. The slurry is granulated and the granulate obtained is subject to main burning, in which the temperature of temporary burning is made higher than the temperature of main burning and the surface oxidation treatment is performed after main burning. <P>COPYRIGHT: (C)2012,JPO&INPIT |
