一种金属纳米微粉制备装置的设计及实验

Design and Experiment of Metallic Nanoparticle Preparation Equipment

以自悬浮定向流技术为理论基础,研制了一种金属纳米微粉制备装置.该装置由高频电源、走丝部分、管路部分、颗粒分级收集部分等组成,可制备粒径范围为15～150 nm的金属或金属间化合物纳米微粉.粉末的基本结构为球形,粒径呈近似正态分布,具有良好的分散性,纯度高.通过实验研究了工艺参数对粒径大小分布的影响,结果表明气流流速、气流压强越大粒径越小,而走丝频率越快粒径越大.在原有装置的基础上,设计了开放式金属粉末制备装置,纳米粉末直接浸润在液体中,实现了粉末的原位封装,拓宽了其应用范围.

An equipment for preparing metallic nanoparticles was de：eloped based on the flow-levitation method. It consists of a high-frequency electric power, metal-wire supplies, inert-gas pipes, nanoparticle divergence and collection part, and so on. The prepared elemental or bimetallic nanoparticles are spherical and range from 15-150 nm in diameter with a normal distribution. This paper explores the factors which have an influence on the size distribution of nanoparticles. The results show that higher gas-flux velocity and pressure and slower wire supply result in smaller nanoparticles. A structure is attached to the equipment to insitu encapsulate the nanoparticles in liquid for preventing nanoparticles from oxidation.