| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide iron nitride-base magnetic powder, usable for backup magnetic tape for high-capacity computers suitable for high recording density. <P>SOLUTION: The method is for manufacturing the iron nitride-based magnetic powder, having an average grain size of 8-20 nm, having a core phase containing a crystal phase, mainly consisting of Fe<SB>16</SB>N<SB>2</SB>, and an outer layer including at least one element selected from among rare earths, Al and Si. It includes a coating process using iron-based oxide or iron-based hydroxide for a start material, for coating an outside layer on the start material. The coating process includes a process of blowing iron-based aqueous solution containing the iron-based oxide or the iron-based hydroxide and solution including a salt of at least one element selected from among the rare earths, Al and Si from separate blow ports for reaction by use of a collision dispersion device 5. <P>COPYRIGHT: (C)2009,JPO&INPIT |
