| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide ferrite particles which have small apparent density, are excellent in flowability, and are agitated, mixed or the like by a small motive power, and to provide a method for producing the ferrite particles. <P>SOLUTION: The method for producing ferrite particles includes covering the surface of each ferrite particle body with alumina, wherein the ferrite particle body is represented by general formula: (M<SB POS="POST">x</SB>Fe<SB POS="POST">3-x</SB>)O<SB POS="POST">4</SB>(wherein, M is at least one kind of metal selected from the group comprising Fe, Mg, Mn, Ca, Ti, Cu, Zn, Sr, and Ni, and 0≤x≤1). The method preferably includes; a process of obtaining slurry by mixing an Fe raw material, an M raw material and water; a process of obtaining granules by spray-drying the slurry; a process of obtaining a precursor for a fired body by firing the granules; a process of covering the surface of the obtained precursor with alumina; and a process of further firing the precursor whose surface is covered with alumina. <P>COPYRIGHT: (C)2012,JPO&INPIT |
