铁粉法与甲醛法在石墨粉表面化学镀铜的工艺对比

Processing Technology of Electroless Copper Plating on Graphite Powder by Iron Powder and Formaldehyde

研究比较了两种化学方法——铁粉法和甲醛法在石墨粉表面镀铜的工艺。结果表明:铁粉法使用混合表面活性剂对石墨粉预处理,40～60℃搅拌下缓慢加入镀液,在pH为1.5～2.O下镀覆15～20 min,50℃干燥可以制备出含铜25%～75%、镀覆效果好的镀铜石墨粉;甲醛法要求对石墨粉敏化、活化、工艺复杂、成本高、副反应产物具有毒性,且铜含量较低的试样镀覆效果不如铁粉法制备的试样。铁粉法镀覆效果好、工艺简单、无毒,列为首选方法。

The processing technology of electroless copper plating on graphite powders by iron powder method and formaldehyde method were studied and evaluated. The iron powder method could produce highly covered copper/graphite powders with 25%- 75% copper under processing following conditions： graphite powders being pretreated by complex surfactants, plating solution added slowly, graphite and iron powders agitated at 40- 60 ℃, electroless copper plated for 15-20 minutes at 1.5-2. 0 pH and dried at 50 ℃. Sensitization and activation processes were very important stages in formaldehyde method. Because of the expensive reagent and low covering rate of copper/graphite powders and poisonous by-product in the formaldehyde method, the iron powder method is recommended.