机械化学反应机制合成Cu-ZnO复合粉

Synthesis of Cu-ZnO composite powders by mechano-chemical reaction mechanism

机械化学反应机制是利用机械功使粉末产生冷焊、破坏、化学反应等机制的重复循环,使得粉末之间形成层状结构,随着施加机械功时间的增长,层状结构间距缩短致使化学反应发生,生成氧化物分布在基体相中产生散布强化。论文作者以CuZn粉末加入适量CuO粉,在适当搅磨参数下实验得到铜基体中弥散分布ZnO的复合粉。结果显示最佳搅磨参数为:转速600r/min、温度30℃、BPR80、球磨时间8～10h,在合金反应过程中会产生(Cu(Zn))2O的中间相结构。

The mechano-chemical reaction mechanism is that the powder repetitively happen cold-jointing, breakage and chemical reaction under the mechanical work, and the layer structures form among the powder, and then the spaces between the layer structures shorten which leads to the occurrence of chemical reactions as the time of applying mechanical work being increased, and the formed oxides finally distribute dispersively in the matrix phase to produce dispersion-strengthening. The present experimental works use the CuZn powder with a reasonable amount of CuO powder as the initial materials, and obtain the ZnO powder of dispersive distribution in the Cu-base matrix under reasonable mix-milling parameters. The results indicate that the best mix-milling parameters are： the rotation speed is 600 r/min, temperature is 30 ℃, BPR is 80, the milling time is 8-10 h and the interim phase structure of Cu2O can form during the alloy reactions.