Preparation of amorphous Ni-P spherical powder by non-electrolytic reduction method.

Abstract

This paper describes a new method to prepare an amorphous Ni-P powder by non-electrolytic reduction. As a starting material a NiCl₂ solution was used and the pH of the solution was controlled by NaOH. Reduction was carried out by titration of NaPH₂0₂ and the reaction temperature was changed from 363K-333K. The reaction products were analyzed with SEM, thermal analysis and XRD. For the reaction a trace of oxygen played an important role. Under air little particle was formed, whereas after bubbling of nitrogen, spherical powders with 2μm diameter were obtained and they were confirmed as the amorphous state with crystalline temperature of about 618K.