射频热等离子体制备球形氧化铝粉末的数值模拟及实验研究

doi:10.15541/jim20170266

无机材料学报 ›› 2018, Vol. 33 ›› Issue (5): 550-556.DOI: 10.15541/jim20170266

射频热等离子体制备球形氧化铝粉末的数值模拟及实验研究

陈文波^1,2, 陈伦江², 刘川东², 程昌明², 童洪辉², 朱海龙³

1. 南华大学电气工程学院, 衡阳 421001;
2. 核工业西南物理研究院, 成都 610041;
3. 山西大学物理电子工程学院, 太原 030006

收稿日期:2017-05-31 修回日期:2017-09-06 出版日期:2018-05-20 网络出版日期:2018-04-26
作者简介:陈文波(1983-), 男, 博士研究生, 讲师. E-mail: snipers2004@163.com
基金资助:
国家自然科学基金(11535003, 11675074);湖南省教育厅项目(15C1174)

Preparation of Spherical Alumina Powder by RF Thermal Plasma: Numerical Simulation and Experimentation

CHEN Wen-Bo^1,2, CHEN Lun-Jiang², LIU Chuan-Dong², CHENG Chang-Ming², TONG Hong-Hui², ZHU Hai-Long³

1. College of Electrical Engineering, University of south China, Hengyang 421001, China;
2. Southwestern Institute of Physics, Chengdu 610041, China;
3. College of Physics and Electronics Engineering, Shanxi University, Taiyuan 030006, China

Received:2017-05-31 Revised:2017-09-06 Published:2018-05-20 Online:2018-04-26
About author:CHEN Wen-Bo. E-mail: snipers2004@163.com
Supported by:
National Natural Science Foundation of China(11535003, 11675074);Project of the Education Department of Human Province (15C1174)

摘要/Abstract

摘要：

研究粉末颗粒在热等离子体(ICTP)中的行为可以为射频等离子体制备球形粉末工艺过程的优化提供参考。首先, 利用FLUENT软件对具有不同粒径分布的氧化铝粉末颗粒在射频热等离子体中的运动轨迹及加热历程进行了数值模拟; 然后, 根据模拟结果所确定的实验参数范围进行了射频热等离子体粉末球化实验, 并将实验测量与数值模拟的结果相结合, 研究了输入功率、送粉速率等参数的改变对具有不同粒径分布的氧化铝粉末球化效果的影响。研究结果表明: 粒径较小的氧化铝粉末颗粒在飞行过程中可以从等离子体内吸收更多的热量, 因此能够被充分加热至完全熔化; 增加系统输入功率、降低送粉速率均能提高单位质量的颗粒从等离子体中获得的能量, 从而在一定程度上提升氧化铝粉末的球化率。

关键词: 射频热等离子体, 氧化铝粉末, 运动轨迹, 加热历程, 数值模拟

Abstract:

Behavior of alumina powder particles in inductively coupled thermal plasma (ICTP) can provide theoretical reference and guidelines for improving preparation process of plasma spheroidization. In this study, the motion trajectories and heating process of alumina powder particles in ICTP were investigated by means of numerical simulation with FLUENT software. Then the plasma spheroidization experiment was carried out on the basis of simulation results, and the effect of input power, powder feeder rate and particle size distribution on alumina powder spheroidization were studied by combination of experimental and the theoretical analyses. The results show that the small particles absorb enough heat from thermal plasma and therefore be heated to completely melt. Furthermore, the particle can get more energy from plasma while the input power of system is increased or the powder feeder rate is decreased, which improve the spheroidization effect of alumina powder particles.

Key words: ICTP, alumina particles, trajectory of particles, heating history, numerical simulation

中图分类号:

TB43

陈文波, 陈伦江, 刘川东, 程昌明, 童洪辉, 朱海龙. 射频热等离子体制备球形氧化铝粉末的数值模拟及实验研究[J]. 无机材料学报, 2018, 33(5): 550-556.

CHEN Wen-Bo, CHEN Lun-Jiang, LIU Chuan-Dong, CHENG Chang-Ming, TONG Hong-Hui, ZHU Hai-Long. Preparation of Spherical Alumina Powder by RF Thermal Plasma: Numerical Simulation and Experimentation[J]. Journal of Inorganic Materials, 2018, 33(5): 550-556.

图/表 12

图1 射频感应等离子体球化系统(a)和等离子体炬装置(b)结构示意图

Fig. 1 Schematic diagram of inductively coupled plasma spheroidization system (a) and plasma torch structure (b)

表1 氧化铝粉末材料物理性质

Table 1 Physical properties for alumina powders

Density /(kg·m^-3)	Specific heat /(J·kg^-1· K^-1)	Melting point /K	Fusion enthalpy /(J·kg^-1)	Boiling point /K	Vaporization enthalpy /(J·kg^-1)
3900	1020	2326	1.07×10⁶	3800	2.466×10⁷

图2 不同粒径分布的氧化铝颗粒在热等离子体中的运动轨迹

Fig. 2 Trajectory of alumina particles with different particle sizes(a) Dp=20-30 μm; (b) Dp=40-50 μm

图3 不同粒径分布的氧化铝颗粒温度

Fig. 3 Particle mean temperature of alumina particles with different particle size distribution

图4 不同输入功率下, 氧化铝颗粒温度变化历程

Fig. 4 Particle mean temperature of alumina particles with different input powers

图5 不同输入功率下, 氧化铝颗粒在热等离子体中的运动轨迹

Fig. 5 Trajectory of alumina particles with different input powers(a) P=56 kW; (b) P=63 kW; (c) P=70 kW

图6 不同输入功率下, 等离子体炬内温度空间分布图

Fig. 6 Spatial distribution of temperature fields with different input powers(a) P=56 kW; (b) P=63 kW; (c) P=70 kW

图7 不同送粉速率下, 等离子体炬内温度空间分布图

Fig. 7 Distribution of temperature fields with different powder feed rates(a) 6.0 g/min; (b) 66.0 g/min; (c) 96.0 g/min

图8 不同送粉速率时氧化铝颗粒温度变化历程

Fig. 8 Particle mean temperature of alumina particles with different powder feed rates

表2 射频感应等离子体炬尺寸

Table 2 Dimensions of RF inductively coupled plasma torch

Parameter	1# Particle	2# Particle
Particle mean diameter/μm	45	25
Plasma power/kW	63.75	56.00
Carry gas flow rate/(L·min^-1)	5	5
Sheath gas flow rate/(L·min^-1)	70	70
Center gas flow rate/(L·min^-1)	34.5	34.5
Powder feed rate/(g·min^-1)	35.0	35.0~65.7
Chamber pressure/kPa	40	40

图9 1#氧化铝颗粒的SEM照片

Fig. 9 SEM images of 1# alumina particles(a) Precursor; (b) After being spheroidization

图10 2#氧化铝颗粒的SEM照片

Fig. 10 SEM images of 2# alumina particles(a) Precursor; (b) Powder feed rate at 35 g/min; (c) Powder feed rate at 65.7 g/min

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射频热等离子体制备球形氧化铝粉末的数值模拟及实验研究

Preparation of Spherical Alumina Powder by RF Thermal Plasma: Numerical Simulation and Experimentation

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