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Korean Journal of Metals and Materials > Volume 55(11); 2017 > Article
Korean Journal of Metals and Materials 2017;55(11): 806-812. doi: https://doi.org/10.3365/KJMM.2017.55.11.806
Role of Voltage and Gas Pressure in Determining the Mean Diameter of Sn-Bi-Ag Intermetallic Compound Nanoparticles Formed by Pulsed Wire Discharge
Dae Geol Jeong1, Jae Min Cha1, Dae Sung Kim1, Ju Hyeong Kim1, Hwa Jin Jeong1, Jae Young Shin1, Jun Hyeon Bae1, Bong Ki Ryu1, Hisayuki Suematsu2, Kenta Tanaka2
1Department of Materials Science and Engineering, Pusan National University, Pusan 46241, Republic of Korea
2Extreme Energy-Density Research Institute, Nagaoka University of Technology, Niigata 940-2188, Japan
Correspondence  Bong Ki Ryu ,Tel: +82-51-510-2384, Email: bkryu@pusan.ac.kr
Received: 8 February 2017;  Accepted: 26 July 2017.  Published online: 31 October 2017.
ABSTRACT
Nanoscale Sn-Bi-Ag compound powders were successfully synthesized using the pulsed wire discharge (PWD) method. In PWD, when a high current is passed through high-density metal wires, the wires explode because of resistance heating, forming fine particles or metal vapor. In this study, we used Sn-Bi and Ag wires in order to obtain three-component nanopowders. A high current was applied to the wires between the electrodes in a N2 atmosphere. We discussed the results based on the K factor, which is the ratio of the charging energy of the capacitor to the vaporization energy of the wire. The three-component (Sn-Bi-Ag) nanoparticles were synthesized under a N2 atmosphere at 4 and 6 kV. From the particle-size distribution curves, it was found that the mean particle diameter (D1) values of the Sn-Bi and Ag nanopowders were within the range of 16.32–42.37 nm under each condition. The melting point of the Sn-Bi-Ag nanoparticles was found to be within the range of 188.68–214.97 ℃, which is about 40 ℃ lower than that obtained from the phase diagram and computational thermodynamics of the Sn-Bi-Ag system. In this study, the nanopowders were obtained by subjecting the wires at extreme energies, to improve their solid solubility.
Keywords: alloy wire, nanoparticles, pulsed wire discharge, three-component
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