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探讨了超细铜粉电沉积制备过程中阴极电流密度对粉体粒径的影响机制。结果表明:电流密度的改变对阴极过电位影响显著,电流密度从0.04A/cm2变化到0.1 A/cm2时,过电位从4.08V变化到9.96V;而过电位的变化直接引起粉体粒径的变化,粒径从大约50nm变化到700nm。分析表明,高电流密度可以获得较高的阴极过电位;在高的阴极过电位条件下,新核的生成速率高且稳定存在的晶核临界半径小,使得粉体粒径变细。
The mechanism of the cathode current density on the particle size of the powder during the electrodeposition process of ultrafine copper powder was discussed. The results show that the change of current density has a significant effect on the cathodic overpotential. When the current density changes from 0.04A / cm2 to 0.1 A / cm2, the overpotential changes from 4.08V to 9.96V. The change of overpotential directly causes the particle size The particle size changes from about 50 nm to 700 nm. The analysis shows that the higher cathode current density can obtain a higher cathodic overpotential. Under high cathodic overpotential conditions, the critical nucleus radius of the new nucleus is high and the stable critical nucleus is small, which makes the particle size thinner.