The formation mechanism and morphology of the nickel particles by the ultrasound-aided spark discharge in different liquid media

Abstract

Spark discharge is widely applied to fabricate the small scale particles. The ultrasound-aided spark discharge process is based on an electrical discharge in liquid media in the electrical discharge machining (EDM). The morphology, element composition, and crystal structure of Nickle particles were observed analyzed by SEM, EDS and XRD, respectively. The EDS and XRD indicated a high purity nickel particle generated in pure water. Plus, the effects of dielectric mediums on the size distribution were investigated. The size distribution of particles in pure water is narrower than in kerosene. This distribution is remarkable after the ultrasound is introduced into the generating process. Based on the attaching and entrapping processes, the formation mechanism of different structural particles was interpreted. The results serve as a guide for the future research on controlling the particle properties such as size and morphology through improving the experimental conditions.

Influence of Liquid Composition and Discharge Energy on Process Performance, Composition, and Properties of Particles Formed During Electric Discharge Erosion of WC-5TiC-10Co Alloy

“…Из-за высокой твердости, прочности и химической стойкости твердые сплавы приходится перерабатывать дорогостоящими химическими способами с использованием опасных и вредных реагентов [17][18][19]. Электроэрозионное диспергирование (ЭЭД) является одним из перспективных альтернативных методов получения порошков без использования этих опасных и дорогостоящих реагентов [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35].…”

The Numerical and Experimental Investigation of Particle Size Distribution Produced by an Electrical Discharge Process

“…Tungsten carbide (WC) nanoparticles were prepared by a pulsed discharge of bulk tungsten and graphite rods immersed in liquid-like ethanol (C 2 H 5 OH), kerosene, and H 2 O [ 16 ]. In our previous work, Ni micro-nanoparticles were prepared by ultrasound-assisted electrical discharge erosion process in H 2 O and kerosene [ 17 , 18 , 19 , 20 ]. The influence of electrical parameters and ultrasound parameters on forming mechanism, size distribution, morphology, phase and hollow ratio of particles was investigated.…”