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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 1    February 2005

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Preparation and characterization of Ni nanopowders prepared by anodic arc plasma
WEI Zhi-qiang(魏智强)1, QIAO Hong-xia(乔宏霞)2,
DAI Jian-feng(戴剑锋)1, FENG Wang-jun(冯旺军)1,
WANG Qing(王 青)1, LI Wei-xue(李维学)1

1. School of Sciences, Lanzhou University of Technology, Lanzhou 730050, China;
2. College of Civil Engineering, Lanzhou University of Technology,
 Lanzhou 730050, China;
3. School of Physical Science and Technology, Lanzhou University, 
Lanzhou 730000, China

Abstract:Ni nanopowders were successfully prepared in large quantities by anodic arc discharged plasma method with homemade experimental apparatus in inert gas. The particle size, microstructure and morphology of the particles were characterized via X-ray diffractometry (XRD), transmission electron microscopy (TEM) and the corresponding selected area electron diffractometry (SAED). The specific surface area and pore parameters were investigated by nitrogen sorption isotherms at 77K with Brunauer-Emmett-Teller (BET) equation and Barrett-Joyner-Halenda (BJH) method. The chemical compositions were determined by X-ray energy dispersive spectrometry (XEDS) and element analysis. The experimental results indicate that this method is convenient and effective, and the nanopowders with uniform size, higher purity, weakly agglomerated and spherical chain shape are gotten. The crystal structure of the samples is FCC structure as the bulk materials, the particle size distribution ranges from 20 to 70nm, and the average particle size is about 46nm obtained by TEM and confirmed by XRD and BET results. The specific surface area is 14.23m2/g, specific pore volume is 0.09cm3/g and average pore diameter is 23nm.

 

Key words: anodic arc plasma; Ni nanopowders; particle size; structure; composition

ISSN 1672-7029
CN 43-1423/U

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