| 摘要 |
PURPOSE:To obtain metal magnetic powder having high saturated magnetization and high corrosion resistance by oxidizing the powder containing iron as a main ingredient with steam-containing carbon dioxide gas at a former stage, and then oxidizing it with steam and oxygen-containing inert gas to stabilize it. CONSTITUTION:Acicular iron oxyhydroxide or iron oxide containing iron as a main body is reduced as metal alloy powder, and preliminarily oxidized at a former stage in a steam-containing carbon dioxide gas atmosphere containing 0.1-10vol.% of steam concentration at 200-250 deg.C to form a uniform stage in an oxygen- and steam-containing inert gas atmosphere containing 0.02-10vol.% of oxygen concentration and 0.1-10vol.% of steam concentration at 30-90 deg.C to form a thin, dense and uniform oxide film in a method for stabilizing the metal alloy powder. Thus, the powder having high saturated magnetization characteristics, large corrosion resistance and small coercive force distribution can be obtained. |
