直流电弧热等离子体制备纳米镍粉过程的数值模拟  

Numerical Simulation of Nickel Nano-powder Preparing Process by DC Arc Thermal Plasma

作　　者：陈文波[1] 李自军 陈伦江[3] 冯军 阳璞琼[1] Chen Wenbo;Li Zijun;Chen Lunjiang;Feng Jun;Yang Puqiong(College of Electrical Engineering,University of South China,Hengyang 421001,China;College of Mechanical Engineering,University of South China,Hengyang 421001,China;Southwestern Institute of Physics,Chengdu 610041,China)

机构地区：[1]南华大学电气工程学院,湖南衡阳421001 [2]南华大学机械工程学院,湖南衡阳421001 [3]核工业西南物理研究院,四川成都610041

出　　处：《稀有金属材料与工程》2024年第7期1999-2005,共7页Rare Metal Materials and Engineering

基　　金：国家磁约束核聚变能发展研究专项(2019YFE03070000);国家自然科学基金(12275121)。

摘　　要：研究镍粉颗粒在直流电弧热等离子体中的汽化过程可以为优化热等离子体纳米镍粉的制备工艺提供参考。本工作通过对磁流体力学方程和颗粒热动力学方程的耦合求解,研究了原料粒径、工作气流量及送粉速率等参数对镍粉颗粒在直流热等离子体中的运动行为及加热过程的影响效应。研究表明,粒径较小的颗粒在高温区内停留的时间更长,从等离子体中吸收到的热量更多,因此能够在更短的时间内被加热到完全汽化;降低工作气流量及送粉速率均可以增加镍粉颗粒从热等离子体中获得的能量,这对于提升颗粒的汽化率,改善最终制备的纳米镍粉品质是有益的。Study on vaporization process of nickel powder particles inside direct current thermal plasma can provide theoretical guidelines for improving preparation process of nickel nanopowder.In this research,the effects of particle size,working gas flow rate and powder feeding rate on the motion behavior and heating process of nickel particles in DC thermal plasma were investigated by coupled solution of the magnetohydrodynamic equations and particle thermodynamic equations.The results show that smaller particles can be heated to complete vaporization in a shorter time owing to longer residence time in the high temperature region and absorbing more heat from the plasma.Decrease in working gas flow rate and powder feeding rate can increase the energy of nickel particle obtained from plasma,which is beneficial to the increase in the vaporization rate of the partials and the quality improvement of the final prepared nickel nano-powder.

关 键 词：直流电弧热等离子体 纳米镍粉 汽化过程 数值模拟 

分 类 号：TG146.15[一般工业技术—材料科学与工程] TB383[金属学及工艺—金属材料]