摘要
采用自行研制的高真空三枪直流电弧等离子体蒸发金属纳米粉体连续制备设备,制备出平均粒径在30~45 nm的纳米锌粉。利用XRD、XRF、TEM以及Simple PCI软件等测试手段对样品的晶体结构、成分、形貌和粒径分布进行表征,并从产率和粒径方面对纳米锌粉的制备机理进行了探讨。结果表明,氢气的加入提高了熔体温度,增加了实际蒸发面积;等离子体产生的过冷度,以及由于循环风量的增加而加剧锌蒸气分子的碰撞形成的过冷度,保证了锌蒸气细小晶核的形成。
The nano-zinc powders with mean particle size from 30nm to 45nm were prepared by self-designed fabricated high-vacuum three-electrode DC arc plasma production apparatus.The crystalline structure,chemical composition,morphology,and particle size distribution of the samples were characterized by XRD,XRF,TEM and simple PCI software.The preparation mechanism of nano-zinc powders was investigated based on yield and particle size.The results show that the adding hydrogen molecule results in the increase of melt temperature and actual evaporation area in melt.The undercooling generated from the plasma and the drastic collision between zinc evaporated molecule as result of increasing cycling wind rate makes sure that the crystal nucleus is fine.
出处
《铸造技术》
CAS
北大核心
2012年第5期531-533,共3页
Foundry Technology
基金
江苏省科技厅社会发展计划资助项目(BS2007120)
国家中小型企业创新基金资助项目(08026213700982)
关键词
纳米锌粉
等离子体
循环风量
过冷度
nano-zinc powder
plasma
cycling wind rate
undercooling
