| 简介 |
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.
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 Fe16N2, 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.
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