| 摘要 |
PURPOSE:To obtain powder, the principal ingredient thereof is iron having excellent oxidation stability, by forming oxide films containing iron onto the surface of the particles of powder formed when a metallic salt aqueous solution, which is dissolved into water while using iron salt as the principal ingredient, is reduced by an alkali metal borohydride and metallic powder, the principal ingredient thereof is iron, is formed, an alkaline aqueous solution is added to the water dispersant of powder formed, and an oxidizing gas is blown in while agitating the liquid. CONSTITUTION:Varieties of water-soluble salt, such as a sulfate of nickel, etc., a halide or the like is used as metallic salt used, sodium boron hydride or the like is used as the alkali metal borohydrides, and the concentration of the alkali metal borohydrides in the case when these alkali metal borohydrides are added to the metallic salt aqueous solution and reduced is kept within a range of 0.1- 10mol/l. An aqueous solution of sodium hydroxide, potassium hydroxide, calcium hydroxide, barium hydroxide, magnesium hydroxide, ammonia water, ammonium hydroxide or the like is used as the alklaine aqueous solution added to the dispersant of metallic powder, and air or oxygen gas or the like is used as the oxidizing gas blown in. |
