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.
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