张爱华, 史梦凡, 段靖邦, 汪重光, 朱亮. 镍铁丝电爆炸特性及超细粉制备[J]. 华南师范大学学报(自然科学版), 2023, 55(2): 41-48. DOI: 10.6054/j.jscnun.2023018
引用本文: 张爱华, 史梦凡, 段靖邦, 汪重光, 朱亮. 镍铁丝电爆炸特性及超细粉制备[J]. 华南师范大学学报(自然科学版), 2023, 55(2): 41-48. DOI: 10.6054/j.jscnun.2023018
ZHANG Aihua, SHI Mengfan, DUAN Jingbang, WANG Chongguang, ZHU Liang. Electro-explosive Properties of Ni-Fe Wire and Preparation of Ultra-fine Powder[J]. Journal of South China Normal University (Natural Science Edition), 2023, 55(2): 41-48. DOI: 10.6054/j.jscnun.2023018
Citation: ZHANG Aihua, SHI Mengfan, DUAN Jingbang, WANG Chongguang, ZHU Liang. Electro-explosive Properties of Ni-Fe Wire and Preparation of Ultra-fine Powder[J]. Journal of South China Normal University (Natural Science Edition), 2023, 55(2): 41-48. DOI: 10.6054/j.jscnun.2023018

镍铁丝电爆炸特性及超细粉制备

Electro-explosive Properties of Ni-Fe Wire and Preparation of Ultra-fine Powder

  • 摘要: 利用非接触式丝电爆制粉装置制备了球形度良好、纯度高的镍铁超细粉,在氩气气氛中使用直径0.4 mm的镍铁丝在不同充电电压下进行实验,同步采集并分析镍铁丝电爆炸放电波形及沉积能量变化规律。建立了镍铁丝电爆炸过程中的时变非线性电阻模型,并与实验曲线进行对比分析;利用扫描电镜观察粉末形貌,分析镍铁丝电爆炸工艺参数对粉末形貌、粒径的影响。结果表明:随着充电电压的升高,放电波形及金属丝沉积能量峰值逐渐增大,沿面击穿时刻逐渐提前;在击穿前金属丝电阻模型与实验曲线符合程度良好;在充电电压为11~15 kV的工艺参数下,可制得球形度良好、粒径分布均匀且纯度较高的超细粉。

     

    Abstract: To prepare Ni-Fe ultrafine powder with good sphericity and high purity, a non-contact wire electrical explosion powder making device was used to conduct experiments, which were carried out in an argon atmosphere using 0.4 mm diameter Ni-Fe wire at different charging voltages. Simultaneously collecting and analyzing the waveform of electrical explosion discharge of Ni-Fe wire and the variation pattern of deposition energy. A time-varying nonlinear resistance model of Ni-Fe wire electrical explosion is developed and compared with the experimental curve for analysis to investigate the mechanism of Ni-Fe wire electrical explosion. The powder morphology is observed by scanning electron microscope to investigate the effect of Ni-Fe wire electrical explosion process parameters on powder morphology and particle size. The results show that the wire voltage, deposition energy and discharge circuit current peak gradually increase with the increase of charging voltage, and the breakdown moment along the surface is gradually advanced. The wire resistance model can reflect the actual resistance change, and the degree of compliance with the experimental curve is good. Superfine powder with good sphericity, uniform particle size distribution and high purity can be produced under the process parameters of charging voltage of 11-15 kV.

     

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