摘要
以CuSO4溶液为原料,采用NaOH沉淀—葡萄糖预还原—水合肼还原工艺(简称两步液相还原法)制得了粒度均匀可控、分散性好、适用于多层陶瓷电容器(MLCC)电极的球形超细铜粉。试验研究了葡萄糖预还原、水合肼的添加方式以及添加剂聚乙烯吡咯烷酮(PVP)和NH4Cl对超细铜粉粒度和形貌的影响。结果表明:葡萄糖预还原和水合肼的分步添加均有利于超细铜粒子的均匀生长;适量PVP的加入有助于超细铜粉粒径均匀并使其形貌趋于一致;NH4Cl可使铜粉的粒径变小,当Cu与NH4Cl的摩尔比为1∶1时,铜粉的形貌会由类球形向正多面体转变。
The ultrafine copper powders were prepared by NaOH precipitation-glucose pre-reduction and hydrate hydrazine reduction process with CuSO4 as material. The ultrafine copper powders are spherical, uniform and well dispersed, which can be used for MLCC electrode. The effects of glucose pre-reduction, hydrate hydrazine reduction process and additive agents of PVP and NH4Cl on copper powders have been studied. The results show that glucose pre-reduction and adding hydrate hydrazine in twice can make copper particles grow uniformly. PVP is beneficial to the uniformity and sphericity of copper powder particles, the molar ratio n （Cu） ： n （NH4Cl） has remarkable influence on the particle size and shape. With the increasing of NH4Cl, the copper particles become smaller, and when the molar ratio of n （Cu） ： n （NH4Cl） is 1 ： 1, shape of copper particles from spheroid turns into polyhedron.
出处
《粉末冶金技术》
EI
CAS
CSCD
北大核心
2007年第6期447-452,共6页
Powder Metallurgy Technology
