SPHERICAL ULTRAFINE NICKEL POWDER WITH HIGH TAP DENSITY AND ITS WET PROCESSES PREPARING MOTHOD

摘要

The present invention provides a wet processes preparing method of spherical ultrafine nickel powder with high tap density. The method is comprised of using nickel sulfate to react with mixed solution of sodium hydroxide and sodium carbonate to generate nickel hydroxide and basic nickel salt, adding polyhydric alcohol as appearance controlling agent, adding yttrium salt as crystal nucleus forming agent, and using hydrazine or hydrazine hydrate as reducer in order to producing excellent spherical nickel powder with high tap density, narrow grain size distributing, strong resist­oxidation, good dispersivity, and mean grain size 0.2-lµm.The invention increases the tap density of nickel powder prapared by wet processes and decreases environment pollution and production cost greatly. Nickel powder prepared by the invention is used to microelectronics laminated ceramic capacitor, powder metallurgy, magnetic material and so on.