| 摘要 |
PURPOSE:To obtain metallic magnetic powder having excellent oxidative stability by adding an aq. soln. prepd. by adding further a complexing agent to an Ni salt, etc. into an alkaline suspension of powder consisting essentially of iron oxide, metallic iron, etc. CONSTITUTION:A soln. formed by adding a complexing agent to an aq. soln. contg. an Ni salt or the Ni salt and a Cu salt is prepd. Such soln. is added into an alkaline suspension of powder consisting essentially of iron oxyhydroxide, iron oxide or metallic iron. An Ni complex compd. or the Ni complex compd. and a copper complex compd. are stuck on the surface of the above-described powder. The powder is then subjected to a heating reduction treatment and the metallic magnetic powder consisting of the metallic magnetic powder composed essentially of iron and the surface protective layer composed essentially of Ni or Ni and Cu formed on the particle surface thereof is obtd. The metallic magnetic powder having excellent oxidative stability is thus obtd. |
