阳极弧等离子体制备镍纳米粉

采用自行研制的实验装置，用阳极弧放电等离子体方法制备了高纯镍纳米粉末。利用X射线衍射(XRD)、透射电子显微镜(TEM)和相应选区电子衍射(ED)、BET吸附等对样品的成分、形貌、晶体结构、晶格常数、粒度及其分布、比表面积进行了分析。建立了关于金属超微粒产生过程的近似模型，分析了纳米粉的形成和生长机制，并对整个工艺过程影响纳米粉性能的各种工艺参数进行了理论探讨。结果表明：所制得的镍纳米粉纯度高，晶格结构与相应的致密体相同，为fcc相结构，平均粒径为47nm，粒径范围在20～70nm，比表面积为14．23m^2／g，呈规则的球形链状分布，并发现纳米晶体的晶格常数发生膨胀。

Preparation of Ni nanopowders by anodic arc plasma

The pure Ni nanopowders was prepared by anodic arc discharging plasma method using self-designed and fabricated experimental apparatus. The product was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and the corresponding electron diffraction (ED), BET to determine the chemical composition, morphology, crystal microstructure, the size and size distribution, the specific surface area. An approximate mode of the process of generating ultra-fine metal particle was built, and the mechanism of forming and growing of Ni nanoparticles was analyzed. The influence of several technology parameters on the property of nanopowders by anodic arc plasma method was also discussed. The experimental results show that the samples with lattice parameter expansion is of high purity, the crystal structure is the same as the bulk materials, i.e. fcc, with average size about 47 nm, ranging from 20 to 70 nm, the specific surface area is 14.23 m~2/g, which is distributed uniformly in spherical chain shapes.