| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a flaky nickel powder at a low cost by continuously feeding a Ni salt aqueous solution and an ammonium ion releasing body to a reaction system kept at a specified temperature and pH value to generate Ni hydroxide particles, reducing them at a specified temperature in a hydrogen atmosphere, and pulverizing the obtained metallic Ni particles. SOLUTION: A spherical Ni hydroxide is generated by continuously feeding a Ni salt aqueous solution and an ammonium ion releasing body to a reaction system in which the reaction temperature is kept at 20-80 deg.C and the pH value is kept in the range of 10-13 with a caustic alkaline aqueous solution. The obtained Ni hydroxide is reduced in the hydrogen atmosphere of >=400 deg.C to <=600 deg.C. Though the metallic Ni particles obtained through the hydrogen reduction are spherical in appearance the same as those ones before reduction, innumerable cracks are generated on the surface of the particles. Thus, they can be slightly pulverized into pieces in a mortar. Flaky Ni powder of <=5μm grain size and suitable for an electrically conductive adhesive can be obtained thereby.
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