工艺参数对阳极弧放电等离子体制备镍纳米粉的影响

在Ar惰性保护气氛中，采用阳极弧放电等离子方法用自行研制的装置制备出了高纯Ni纳米粉末。研究了在制备过程中电弧电流、气体压力等工艺参数对纳米粉产率及粒度的影响。利用XRD、TEM对制得的样品的形貌、晶体结构、粒度及其分布进行测定。结果表明，适当控制某些工艺参数就能制取粒径范围在20nm～100nm的纳米粉，在其它工艺参数不变条件下，气压升高或电弧电流增大，都会使粒度增大，产率提高。

Effects of Technology Parameters of Anodic Arc Discharged Plasma on Preparation of Ni Nanopowders

In inert gas, pure Ni nanopowders were prepared by anodic arc discharged plasma method utilizing self-designed and fabricated experimental apparatus, and the influence of arc current and gas pressure on the production rate and particle size of metal nanopowders in the process was studied. The product was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and the corresponding electron diffraction (ED) to determine the morphology, crystal microstructure, the size and size distribution. The experiment results revealed that Ni nanopowders with particle size range from 20 nm to 100 nm can be obtained by using the suitable controlled experimental apparatus. The production rate and particle size increase with raising arc current or gas pressure when other factors are fixed. The crystal structure of Ni nanopowders is the same as the bulk materials, is fcc phase.