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

doi:10.11896/cldb.20010149

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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.

Key words： EDM ultrasonic power sound pressure cavitation bubble threshold particle size distribution

Published: 28 January 2021

CLC number:

TG146

Fund:The National Natural Science Foundation of China(51275324, 51435011); Special work on Innovative Methods of Ministry of Science and Technology: Sichuan Province Innovative Methods Promotion and Application Demonstration(20171M010700).

About author:: Faming Lin,from 2016 to present, Ph.D. student, School of Mechanical Engineering, Sichuan University, focusing on the research of electric spark micro-nano powder and computer numerical control technology. From 2004 to 2011, he obtained a bachelor of engineering degree and a master of engineering degree in mechanical manufacturing and automation from Sichuan University.
Xianglong Liis a professor and postgraduate tutor of School of Mechanical Engineering, Sichuan University. In 1993, he received his B.E. degree in mechanical manufacturing technology and equipment from the Harbin Engineering University, and from 1996 to 2003, he received his M.E. degree and Ph.D. degree in mechanical manufacturing and automation from Sichuan University. His main research directions include the special processing, computer numerical control techno-logy and industrial equipment automation, product innovation design.

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Cite this article:

LIN Faming,HOU Qilong,WANG Jie, et al. Impact of Ultrasonic Power on Particle Size in Ultrasonic Assisted EDM Preparation of Nanometer Nickel Particles[J]. Materials Reports, 2021, 35(2): 2115-2119.

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http://www.mater-rep.com/EN/10.11896/cldb.20010149 OR http://www.mater-rep.com/EN/Y2021/V35/I2/2115

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