粒径可控高振实密度球银的制备工艺研究

Study on Preparation of Size-Controllable Spherical Ag Powders with High Tap Density

摘要:

以硝酸银为原料，对苯二酚(C6H4(OH)2)为还原剂，链烷醇胺A为分散剂，用液相化学还原法制备高振实密度超细银粉。用激光粒度分布仪测试银粉的粒度分布与平均粒径，用扫描电子显微镜(SEM)和透射电子显微镜(TEM)分析银粉的形貌、粒径和团聚状态，用多晶X射线衍射(XRD)仪检测粉体的晶相。结果表明：通过调节硝酸银的浓度、硝酸银与还原剂的配比以及分散剂的用量等，可以实现对所制备球银粒径的控制；制备的超细银粉为面心立方晶体结构，呈规则球形，振实密度可达4.0 g/cm3。

Abstract:

The ultrafine Ag powders with relatively high tap density were prepared by a chemical reduction method using AgNO3 as raw material. Hydroquinone and chain triacontanol amine were chosen as reductant and dispersant agent, respectively. The laser fineness gage was used to investigate the grain size distribution and the average diameter of Ag powders. The morphology, grain size and agglomerating state of Ag powders was examined by SEM and TEM. The phase composition of Ag powders was characterized by XRD. The results show that the grain size of Ag powders can be controlled by adjusting the concentration of AgNO3, the ratio of AgNO3 to reductant and dispersant agent dosage. The Ag powder obtained is of face-centered cubic crystal structure with quasi-orbicular morphology. The average tap density of the silver powders is up to 4.0 g/cm3.