Impact of Ultrasonic Power on Particle Size in Ultrasonic Assisted EDM Preparation of Nanometer Nickel Particles
LIN Faming1,2, HOU Qilong1, WANG Jie1, LI Xianglong1
1 School of Mechanical Engineering, Sichuan University, Chengdu 610065, China; 2 School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Abstract: The ultrasonic-assisted electrical discharge is a green, easy and controllable approach to generate micro-nano metallic powders. To investigate the effect of focused ultrasonic power on the morphology and particle size distribution of micro-nano metallic powders, the COMSOL multiphasic simulation software was applied to simulate the sound pressure distribution of ultrasonic in the working box to determine the discharge position. By comparing the maximum sound pressure value with the ultrasonic cavitation threshold, the transducer power required to form cavita-tion was determined, and the influence range of different ultrasonic power on particle size was obtained through theoretical calculation. Finally, the experiment of preparing nickel powder was carried out by using self-made laboratory equipment. The morphology of the prepared nickel powder was observed by SEM, and the particle size distribution of nickel powder was analyzed by laser particle size analyzer to verify the theoretical analysis results. The results show that the ultrasonic cavitation and vibration effects can break the vaporized and molten metal droplets generated by spark discharge; the shock wave generated by the cavitation bubble burst in the working fluid causes the collision of small-sized nickel powder particles, and the kinetic energy is converted into thermal energy, the high temperature generated forms sinter necks between the metal particles, causing multiple small particles to reunite into irregular large particles.
林发明, 侯启龙, 王杰, 李翔龙. 超声辅助电火花放电制备微纳米镍颗粒中超声功率对颗粒粒径的影响[J]. 材料导报, 2021, 35(2): 2115-2119.
LIN Faming, HOU Qilong, WANG Jie, LI Xianglong. Impact of Ultrasonic Power on Particle Size in Ultrasonic Assisted EDM Preparation of Nanometer Nickel Particles. Materials Reports, 2021, 35(2): 2115-2119.
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2021, Vol. 35 
