PREPARATION OF Co50Ni50ULTRAFINES BY CO-REDUCTION OF SOLUTION IN PRESENCE OF POLYMER①
(Structure Research Laboratorya, Department of Chemistryb,Department of Applied Chemistryc, Department of Mechanicsd,University of Science and Technology of China, Hefei 230026, P. R. China)
Abstract: The reduction reaction of aqueous Co2+-hydrazine, which cannot be conducted under the common condition, is carried out by using both of low-temperature heating and stirring. Metallic ultrafines are prepared by this method. In the presence of polyvinyl alcohol (PVA), it is absorbed on the surface of particles of the product and forms a structure of complex particle, which is favorable to the stability of the powder size distribution. Co50Ni50 magnetic alloy ultrafines with fcc-cubic system can also be prepared from Co2+-Ni2+ hybrid solution by the same method in the presence of PVA. The effect of PVA amount on the particle size and the stability of Co50Ni50 alloy ultrafines are emphatically discussed.
Key words: Co50Ni50 magnetic alloy ultrafines Co-reduction of solution polymer(CRSPP)