| 摘要 |
PROBLEM TO BE SOLVED: To obtain a Co-Ni amorphous alloy by liq. phase reduction by compos ing it of spherical particles in which the average particle size is regulated to specified value or below. SOLUTION: By a liq phase reducing method, spherical amorphous Co-Ni-P ternary allow powder havingη3μm average particle size can be obtd. This liq. phase reduction is executed concretely as follows: an aq. soln. of Co salt such as cobalt chloride, an aq. soln. of nickel salt such as nickel chloride and an aq. soln. in which a reducing agent, a complex agent, a pH regulating agent and a pH buffer are dissolved are stirred at >=353 K and are mixed, the formed precipitates are separated into solids and liquids, and drying is executed by warm wind to obtain a powdery product. As the reducing agent, sodium hypophosphite or the like is used. As the complexing agent, trisodium citrate or the like is used, and they fulfill functions of disturbing the formation of hydroxides caused by the Co ions and Ni ions and assisting the reduction of these ions. As the pH regulating agent, NaOH or the like is used, and regulation to the pH in which the reducing rate is made high is executed. As the pH buffer, boric acid or the like is used.
|
