导电浆料用超细铜粉的制备

Preparation of ultrafine copper powder for conductive paste

以明胶为分散剂,通过葡萄糖-水合肼两步法液相化学还原Cu SO4·5H2O制备超细铜粉,并对产物进行X射线衍射(XRD)、粒度分布、扫描电子显微镜(SEM)的表征。XRD分析表明水合肼浓度达到4.8mol·L-1时,两步还原法制得的超细铜粉颗粒中不再含氧化亚铜;粒度分布分析结果显示,不同温度和不同水合肼浓度对铜粉颗粒尺寸分布有很大的影响,反应温度升高铜粉粒径集中呈现上升趋势,而水合肼浓度增大铜粉粒径集中呈现下降趋势;SEM表明随着明胶加入量的增多,铜粉的粒径先减小后增大。

Ultrafine copper particles were prepared in aqueous solution containing blue copper by using glu- cose and hydrazine hydrate as two steps reductants and using gelatin as dispersant. XRD, particle diameter distri- bution analysis and SEM were employed to study the synthesized powder. The result of XRD suggested that cuprous oxide no longer existed in ultra-fine copper powder synthesized with two-step deduction method when the concentration of hydrazine hydrate was more than 4.8mol·L-1. Particle diameter distribution analysis demonstrated that the distribution was strongly influenced with temperature and concentration of hydrazine hydrate, the particle diameter increased with the increasing of temperature and the decreasing of concentration of hydrazine hydrate. The result of SEM suggested that the particle diameter decreased firstly and then increased with the increasing of concentration of gelatin.