添加剂对制备MLCC电极用超细铜粉形貌的影响

Effects of Additive Agent on the Morphology of Superfine Copper Powders for MLCC Electrode

  • 摘要: 采用葡萄糖预还原,后阶段以水合肼作为还原剂,在液相中还原CuSO4的方法制备超细铜粉。研究了聚乙烯吡咯烷酮(PVP)、NH4Cl、NaOH对超细铜粉粒度和形貌的影响。结果表明,制得的铜粉形貌呈球形,粒径均匀可控,分散性好。加入适量的PVP有助于超细铜粉粒径均匀和形貌规范;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方体转变;微量的NaOH能有效消除超细铜粉表面的棱峰,使铜粉的表面更圆滑,同时也可以使铜粉粒径变小。

     

    Abstract: The spheroid,uniform and well-dispersed superfine copper powder used in MLCC was prepared by using glucose and hydrazine hydrate to deoxidize CuSO4 in acqueous solution.The effects of PVP,NH4Cl and NaOH on copper powders are studied.The results show that an amount of PVP is beneficial to the uniformity and sphericity of copper powder and NH4Cl has a great influence on the particle size and shape.With the amount of NH4Cl increases,the copper particles become smaller,and when the value of n(Cu):n(NH4Cl) is 1:1,the copper particles become cuboid from spheroid.NaOH can effectively eliminate the wrinkle of copper particles,at the same time,the copper particles become smaller,too.

     

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