| METALS AND METAL MATRIX COMPOSITES |
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| 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
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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 |
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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. 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.
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Published: 24 July 2020
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| Fund:This work was financially supported by 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:: Qilong Houis a master degree candidate of School of Mechanical Engineering, Sichuan University. His research focus on the special processing of electric spark ultrasonic and preparation of micro-nano powder.
Xianglong Liis an associate 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 direction include the special processing, computer numerical control technology and industrial equipment automation, product innovation design. |
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2020, Vol. 34 
