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

• Published in: Transactions of Nonferrous Metals Society of China 2010-08, Vol.20 (8), p.1550-1554
• Main Author: 安兵 蔡雄辉 吴丰顺 吴懿平
• Format: Article
• Language: English
• Subjects: China; Diffraction; High speed; iron(II) sulfate heptahydrate; micro-sized powder; Silver; Silver nitrates; silver powder; Smoothness; Sulfates; wet-chemical method; X-rays; 微米级颗粒; 扫描电子显微镜; 湿化学法; 球形粒子; 硝酸银溶液; 硫酸亚铁
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(09)60337-X

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.