液相还原法制备车电容用微纳米铜粉的特性表征研究

Characterization of micro/nano copper powder for vehicle capacitors prepared by liquid phase reduction method

采用液相还原法制备车电容用微纳米铜粉,通过X射线衍射仪和扫描电子显微镜研究pH值、混合方式对产物成分、形貌和粒径的影响。结果表明：当溶液pH值为6或8时,制得的产物为面心立方结构的Cu粉;随着pH值增大到10,产物中除了存在单质金属Cu,还有Cu_2O相。铜产物颗粒形状为不规则的光滑多面体结构,颗粒粒径随pH值增大不断降低。同样实验条件下（溶液pH值为3）,以倾倒方式进行混合得到的铜粉产物粒径尺寸分布窄,颗粒尺寸约为1μm,具有良好的分散性。

The micro/nano copper powder for vehicle capacitors was prepared by liquid phase reduction method.The effects of pH value and mixing method on the composition,morphology and particle size of the product were studied by X-ray diffraction and scanning electron microscope. The results show that when the pH value of the solution is 6 or 8,the product is Cu powder with face-centered cubic structure. As the pH value increases to 10,there is Cu_2 O phase in addition to the metal Cu in the product. The shape of copper particles is irregular smooth polyhedral structure,and the particle size decreases with the increase of pH value. Under the same experimental conditions（pH=3）,the copper powder particles mixed by pouring method have narrow particle size distribution,the particle size is about 1 μm,which has good dispersibility.