摘要
硝酸银溶液中加入浓氨水配制成一定pH的银氨溶液,加入双氧水作还原剂制备超细银粉,对加料方式、银氨溶液pH值、AgNO3溶液浓度、双氧水浓度等参数以及分散剂对银粉的影响进行研究。结果表明,采用正向快速加料法可制备出分散性好的银粉;调节银氨溶液pH值可改变银颗粒的Zeta电位,进而改变银粉的分散性;银粉粒径随双氧水浓度提高先增大后减小,随AgNO3溶液浓度提高而增大;分散剂对银粉形貌有较大影响。在硝酸银溶液浓度为0.1~0.3mol/L,银氨溶液pH值为10.0~11.0,双氧水浓度（质量分数）为3%的条件下,不使用任何分散剂可制备出分散性较好、平均粒径1.9~2.3μm的类球形银粉。
The ultra-fine silver powder was prepared using silver ammonia solutioin with a certain pH value prepared by adding stronger ammonia water in AgNO3 solution as feed solution, and adding hydrogen peroxide as reducer. The effects of the feeding mode, pH value, dispersants, concentration of AgNO3 and H2O2 on the morphology and particle size of silver powder were investigated. The results show that the optimal dispersive silver powder can be prepared by positive rapid addition of H2O2. The Zeta potential of silver particles can be tuned by changing pH value of silver ammonia, then influence the silver powder dispersity. Silver particle size first increases then decreases with increasing H2O2 concentration, while it increases with increasing the AgNO3 concentration. The dispersants have great effect on the morphology of silver powder. The optimal spherical like and dispersive silver powder with mean particle size of 1.9- 2.3 μm can be prepared with the AgNO3 concentration of 0 of 3% with the absence of dispersants. 1-0.3 mol/L, the pH value of 10.0~11.0, H2O2 mass fraction
出处
《粉末冶金材料科学与工程》
EI
北大核心
2015年第6期928-936,共9页
Materials Science and Engineering of Powder Metallurgy
基金
国家国际合作专项(2014DFA90520)
广东省产学研项目(2013A100003)
博士研究生自主探索创新项目(2015zzts035)
关键词
超细银粉
双氧水
分散剂
ZETA电位
气泡分散机理
ultra-fine silver powder
hydrogen peroxide
dispersant
Zeta potential
bubble dispersive mechanism
