微米球形银粉粒径的优化分析

Optimization on Particle Size of Micron Spherical Silver Powder

摘要:

采用化学还原法制备微米银粉且用正交试验对工艺进行了优化。以聚乙二醇 (PEG-10000) 为分散剂和乙醇为消泡剂，以抗坏血酸在超声波下和碱性环境下直接还原硝酸银得到银溶胶，经过滤、洗涤、恒温干燥处理得到银粉。研究滴加顺序、消泡剂用量、pH值对银粉粒径的影响，利用SEM、XRD对银粉进行分析。结果表明，在0.3 mol/L硝酸银溶液和25 mL消泡剂乙醇、T=40 ℃和pH=7条件下，超声波振荡时间10 min，可制备粒径1.13 μm左右，粒径分布窄的球形银粉。

Abstract:

Micro-sized silver power was prepared from AgNO3 power by chemical reduction, and the technique was optimized by orthogonal experiment. The silver sol was obtained from silver nitrate via chemical reduction in ultrasonic wave and alkaline environment using polyethylene glycol (PEG-10000) as dispersant and alcohol as antifoam agent, and after agitation, the sol was filtered, washed and dried at constant temperature to obtain silver powder. Effects of reagents adding order, pH and dosage of alcohol on the silver particle size were investigated. The silver powders were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Results show that with 0.3 mol/L AgNO3 solution, 25 mL ethanol, T=40 oC, pH=7 and 10 min ultrasonic wave vibration, spherical silver power of about 1.13 mm particle size and narrow particle size distribution was prepared.