摘要
采用液相还原法制备超细银粉,以稀硫酸为分散剂,抗坏血酸为还原剂,硝酸银为银源,研究了反应物混合方式、硝酸银浓度以及温度对银粉特性的影响。分别采用激光粒度仪、扫描电镜、X-射线衍射仪及振实密度仪对所制备银粉的特性进行表征。确定较优工艺条件为:[AgNO3]=0.5mol/L,n(C6H8O6)∶n(AgNO3)=2∶1,分散剂与硝酸银质量比为10%,pH值为5,反应物混合方式为还原剂快速倾倒加入到硝酸银溶液中,反应温度为室温。较优工艺条件下所制备的银粉为单分散球形银粉,平均粒径为2.5μm,松装密度为2.5g/cm3,振实密度为4.6g/cm3。
Ultrafine silver powder was prepared by liquid-phase reduction method using dilute sulphuric acid as dispersant,ascorbic acid as reducing agent and silver nitrate as metal source.Effects of reactant mixing manner,silver nitrate concentration and temperature on the characteristics of silver particles were studied. Properties of the silver powder was characterized by laser particle analyzer,scanning electron microscopy,x-ray diffraction and tapping apparatus.Optimum condition was:[AgNO3]=0.5mol/L;n(C6H8O6)∶n(AgNO3)= 2∶1;mass ratio of dispersant to silver nitrate=10%;pH=5;reactant mixing by dumping the reducing agent quickly into the silver nitrate solution;and reaction at room temperature.Monodisperse spherical silver particles with mean particle size of 2.5μm,apparent density of 2.5g/cm3 and tap density of 4.6g/cm3 can be obtained at the optimum condition.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2014年第2期219-222,275,共5页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目(50974065)
云南省自然科学基金资助项目(2011FZ031
2013FA012和2013FB022)
关键词
微米银粉
单分散
球形
液相还原法
micrometer-sized silver powders
monodisperse
spherical
liquid-phase reduction method
