Preparation of micro-sized and uniform spherical Ag powders by novel wet-chemical method  

作　　者：安兵 蔡雄辉 吴丰顺 吴懿平 

机构地区：[1]Division of Optoelectronic Materials&Micro/Nano Manufacturing,Wuhan National Laboratory for Optoelectronics,Wuhan 430074,China [2]Department of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Transactions of Nonferrous Metals Society of China》2010年第8期1550-1554,共5页中国有色金属学报（英文版）

基　　金：Project(2006AA04A110) supported by the National High-tech Research and Development Program of China;Project(60976076) supported by the National Natural Science Foundation of China。

摘　　要：A novel wet-chemical method was presented for the preparation of the micro-sized and uniform spherical Ag powders on a mass-production scale.The well-defined particles were synthesized by mixing the iron(II) sulfate heptahydrate solution with silver nitrate solution directly by high-speed stirring at room temperature.It is found that a large number of micro-sized and uniform spherical particles with rough surfaces are obtained.The mass ratio of iron(II) sulfate heptahydrate to silver nitrate greatly affects the shape of particles,and when it is relatively low,spherical particles cannot be obtained.The reaction temperature has a great impact on the particle size.As the reaction temperature increases from 8 to 15°C,the mean diameter of particles decreases from 3.5 to 1.6 μm.The additive n-methyl-2-pyrrolidone improves the surface smoothness and compactness of the particles while the particle size is kept unchanged.Scanning electron microscopy,X-ray diffractometry and energy dispersive X-ray analysis were used to characterize the particle products.A novel wet-chemical method was presented for the preparation of the micro-sized and uniform spherical Ag powders on a mass-production scale. The well-defined panicles were synthesized by mixing the iron（Ⅱ） sulfate heptahydrate solution with silver nitrate solution directly by high-speed stirring at room temperature. It is found that a large number of micro-sized and uniform spherical particles with rough surfaces are obtained. The mass ratio ofiron（Ⅱ） sulfate heptahydrate to silver nitrate greatly affects the shape of particles, and when it is relatively low, spherical particles cannot be obtained. The reaction temperature has a great impact on the particle size. As the reaction temperature increases from 8 to 15℃, the mean diameter of particles decreases from 3.5 to 1.6 μm. The additive n-methyl-2-pyrrolidone improves the surface smoothness and compactness of the particles while the particle size is kept unchanged. Scanning electron microscopy, X-ray diffractometry and energy dispersive X-ray analysis were used to characterize the particle products.

关 键 词：silver powder wet-chemical method iron(Ⅱ)sulfate heptahydrate micro-sized powder 

分 类 号：TB383.3[一般工业技术—材料科学与工程]