等离子弧流溅射法制备纳米镍粉中的氢作用机制

The Hydrogen Mechanism Study in Preparing Nanonickel by Plasma Arc Spraying Method

摘要:

在自由弧中利用含熔融氢的等离子射流直接作用于自耗Ni 阳极,制备了金属纳米镍粉末。发现工作压力影响并不遵循一般真空蒸发规则,判断氢的加入才是影响制粉产率的关键因素,氢气氛加入能大幅提高制粉产率;提出“微气相分子蒸发”机制阐述氢作用原理,并解释产率与气相中氢分压同步增长的原因。

Abstract:

Nano-metal nickel powder is prepared by liberty arc in which fusible hydrogen is joined as cathode shoot. It is found that the influence of working pressure do not followed the classical rules. Hydrogen is a key factor to improve the productive efficiency of nano metal powder. The mini-hydrogen bubble in fusible metal can lead to the vacuum evaporating of Nickel, so the powder productivity is proportional to the hydrogen pressure. The molecular evaporating mechanism of hydrogen in Ni bubble is presented.