Effect of Ultrasonic Power on the Particle Size of Multiscale Nickel Powders Produced by the Focused Ultrasound-assisted Electrical Discharge Machining
HOU Qilong1, LIU Yifan2, LIN Faming1,3, LI Xianglong1
1 School of Mechanical Engineering, Sichuan University, Chengdu 610065, China; 2 School of Materials and Energy,University of Electronic Science and Technology, Chengdu 611731, China; 3 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. Then, according to the simulation results, a lab-made equipment was used to carry out the experiments in pure water with nickel bar as electrode. After the experiments, the morphology of micron-scale and nano-scale nickel powders were observed, and the size distributions were analyzed. The results reveal that the cavitation and vibration effects of focused ultrasound can effectively break the metal vapor clusters and droplets in the solid-liquid phase, which helps to decrease the size and obtain the Ni particles colloids with very small size. The shock wave generated by acoustic cavitation makes the nickel particles collide, which results in a high temperature to form a sintering neck between two nickel powders. In addition, spherical particles agglomerate into irregular particles with large size. However, due to the small size effect, the energy generated by the collision is not enough to make the agglomeration phenomenon between small size particles.
侯启龙, 刘一凡, 林发明, 李翔龙. 聚焦超声辅助电火花制备多尺度镍粉时超声功率对镍粉粒径的影响[J]. 材料导报, 2020, 34(16): 16114-16118.
HOU Qilong, LIU Yifan, LIN Faming, LI Xianglong. Effect of Ultrasonic Power on the Particle Size of Multiscale Nickel Powders Produced by the Focused Ultrasound-assisted Electrical Discharge Machining. Materials Reports, 2020, 34(16): 16114-16118.
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2020, Vol. 34 
