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Kim, Dae Sung,Kim, Jong Hwan,Suematsu, Hisayuki,Tanaka, Kenta,Ryu, Bong Ki American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.10
<P>Nanoscale compound powders of Sn-Bi-Cu were successfully synthesized using pulsed wire discharge (PWD). Sn-Bi-Cu powder is used Pb-free soldering materials at low temperature. When the particle size of the Sn-Bi-Cu synthesized as nano-scale has the advantage of lowering the melting point, improving wettability, and stabilizing reaction interface. In PWD, when a high current is passed through high-density metal wires, the wire explodes because of resistance heating, which forms fine particles or metal vapor. We used two wires, Sn-Bi alloy wires and Cu wires, to obtain three-component nanopowders. A high current was applied to the wires between the electrodes in a N-2 atmosphere. We discuss the results based on the K factor, which is E-C/E-V, where E-C and E-V are the charging energy of the capacitor and the vaporization energy of the wire, respectively. Nanoparticles with three components, Sn-Bi-Cu, were synthesized under N-2 atmosphere at voltages of 4/6 kV. According to the particle-size distributions, the mean particle diameter of the prepared Sn-Bi and Cu nanopowders was 14.56-40.36 nm for each condition. In this study, We successfully three-component nanopowders synthesized and subjected two wires to extreme energies by the PWD method to form a nanopowder by overcoming its limited solid solubility.</P>
( Jong Hwan Kim ),( Dae Sung Kim ),( Hisayuki Suematsu ),( Kenta Tanaka ),( Bong Ki Ryu ) 대한금속재료학회(구 대한금속학회) 2017 대한금속·재료학회지 Vol.55 No.1
We used Sn-58Bi and Cu wires to investigate the effects of variable conditions (such as pressure and wire diameter) on the formation of three-component nanoparticles. In the synthesis of the three-component nanoparticles, pulsed wire discharge was used to sublimate the wires. In this system, the K factor is described as E<sub>c</sub>/E<sub>s</sub>, where E<sub>c</sub> and E<sub>s</sub> are respectively the applied energy and the sublimation energy of the system. Experiments were conducted in a N<sub>2</sub> atmosphere using the following parameters: voltage of 6 kV, pressure of 50-100 kPa, and Cu wire diameters of 0.1 and 0.2 mm. X-ray diffraction and field emission scanning electron microscopy were employed for structural analysis, particle size distribution analysis, collection rate, and composition studies of the nanoparticles. (Received May 4, 2016; Accepted July 12, 2016)
Dae Geol Jeong,Jae Min Cha,Dae Sung Kim,Ju Hyeong Kim,Hwa Jin Jeong,Jae Young Shin,Jun Hyeon Bae,Bong Ki Ryu,Hisayuki Suematsu,Kenta Tanaka 대한금속ㆍ재료학회 2017 대한금속·재료학회지 Vol.55 No.11
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 N<sub>2</sub> 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 N<sub>2</sub> atmosphere at 4 and 6 kV. From the particle-size distribution curves, it was found that the mean particle diameter (D<sub>1</sub>) 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. (Received February 8, 2017; Accepted July 26, 2017)