采用约束弧等离子体方法成功制备了高纯铝纳米粉末,利用X射线衍射(XRD)、透射电镜(TEM)和相应选区电子衍射(SAED)对样品的晶体结构、形貌、粒度进行性能表征.对约束弧等离子体方法制备金属纳米粉的形成和长大过程进行了分析,并对制备过程中工艺参数(气体种类和压力、电弧电流等)对纳米粉产率及粒度的影响规律进行了讨论.实验结果表明:本法所制备的铝纳米粉末的晶体结构为fcc结构的晶态,呈规则的球形.适当控制某些工艺参数就能制取粒径在20～100 nm的纳米粉,在其它工艺参数一定时,随着工作气压升高、电流强度的增加,产率和平均粒径都随之增大.
Pure Al nanopowders were successfully prepared by confined arc plasma method. The crystal structure,morphology and particle size of the nanopowdera were characterized by X-ray diffraction (XRD) ,transmission electron microacopy (TEM) and the corresponding selected area electron diffraction (SAED) . The process of forming and growing of the metal nanopowders prepared by confined arc plasma were analyzed,and the influences of processing parameters on product yield and particle size of the metal nanopowders were discussed. The experimental results show that the crystal structure of the Al nanopowders is fcc structure,and distributed uniformly in spherical ahape. Al nanopowders with particle size ranging from 20 to 100 nm can be obtained under proper processing parameters. The yield and particle size of the Al nanopowders go up witb the increase of arc current and gas pressure under constant other parameters.
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