摘要
以联氨为还原剂、柠檬酸做络合剂,采用化学镀工艺制备核壳结构的钴包覆铁复合粉末,研究反应温度、pH值、联胺和络合剂的浓度及镀液中铁粉含量对铁粉增重的影响。结果表明,当反应温度低于70℃或pH<12.5时化学镀均无法进行;随络合剂浓度增加,粉末增重逐渐减少;镀液中铁粉含量对化学镀反应影响不大。优化的工艺参数为反应温度78℃,pH值13.0,柠檬酸浓度15 g/L、联胺浓度0.75 mol/L。采用X射线衍射、金相显微镜、扫描电镜及能谱分析等对钴含量约20%的Co/Fe核壳粉末进行分析,表明Co/Fe核壳粉末包覆层均匀、致密。
Iron/cobalt core-shell composite powders were successfully fabricated by chemical plating process using hydrazine as reductant.The effects of reactive temperature,PH value,concentration of hydrazine and complexing agent and Fe content on the weight gain of Fe powder were studied.The results show that the chemical plating can not carry out when the reactive temperature lower than 70 ℃ or pH12.5.The weight gain of Fe powder decreases with the increasing of concentration of complexing agent.Fe content has little effect on the chemical plating.The optimum parameters of chemical plating identified through measuring the weight gain of prepared powders are as follows： reactive temperature of 78 ℃,pH value of 13,concentration of citric acid of 15 g/L,and hydrazine concentration of 45 mL/L.The properties of prepared powders with Co mass fraction of 20% were characterized by means of XRD,SEM and EDS,it is found that Co/Fe core-shell composite powder owns densification and homogeneous microstructure.
出处
《粉末冶金材料科学与工程》
EI
2010年第3期265-270,共6页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金创新团队项目(507210003)
