丝电爆制备纳米粉中的电极烧损和大颗粒形成

Electrode Burning Loss and Formation of Micron-size Particles in Wire Electrical Explosion

分别通过接触式和气体放电式丝电爆法制备纳米粉,观察电极烧损情况并统计粉末中微米级大颗粒的比例。结果表明,气体放电式丝电爆过程电极烧损比较轻微,制备的粉末中微米级大颗粒比例较小,并且更有利于工程上连续实施。提高初始电压也可以减小粉末中微米级大颗粒的比例。

Nanopowders were prepared with wire electrical explosion （WEE） of ＂contact＂ and ＂gas dis-charge＂ , respectively. The burning loss of electrodes was observed and the micro-size particle percentage was calculated. The results show that, during the process of WEE of ＂gas discharge＂, the ablation of elec-trodes is slight, the proportion of micro-size particles in nanopowders is smaller, and the WEE of ＂gas dis-charge＂ is more applicable for engineering. Furthermore, increasing the initial charging voltage could re-duce the proportion of micron-size particles.