[20p-PB2-1~18] 9.2 Nanowires and Nanoparticles

▼ [20p-PB2-17] Particle Size Determining Equation in Submicron Magnesium Preparation by Pulsed Wire Discharge

〇(M2)HIEU DUY NGUYEN^1,3, TOKOI YOSHINORI^2,7, KENTA TANAKA^1,3, TORU SASAKI^1,6, TADACHIKA NAKAYAMA^1,5, HISAYUKI SUEMATSU^1,4, KOICHI NIIHARA^1,4 (1.Nagaoka Univ. of Tech., 2.National Inst. of Tech. Nagaoka College, 3.Extreme Energy-Density Research Inst., 4.Dept. of Nuclear System Safety Engineering, 5.Dept. of Mechanical Engineering, 6.Dept. of Electrical, Electronics and Information, 7.Dept. of Electrical and Electronics System Engineering)

Keywords:particle size, magnesium particles, pulsed wire discharge

In present study, a particle size determining equation of submicron magnesium particles prepared by pulsed wire discharged (PWD) in argon gas is proposed. The equation is derived from the experimental results obtained in the present study and published literature. In previous study, a particle size determining equation of copper nanopowders prepared by PWD in nitrogen gas was proposed. In this equation, a theoretical plasma/vapor density (D_th) is defined as mPE_c^-1, where m, P, and E_c are the weight of the wire, pressure of nitrogen gas, and charged energy in the capacitor, respectively. In present study, due to the difference in atomic weight and other properties between magnesium and copper, a correction is added in D_th by dividing mPE_c^-1 by atomic weight and multiplying mPE_c^-1 by cubic of critical radius(r_c). From high-speed photographs obtained during PWD, the relationship between measured D_exp and D_th is shown by D_exp∝D_th^0.55. From observation of transmission electron microscope, the relation between geometric mean particle diameter D₁ and D_th is found to be D₁∝D_exp^0.46∝D_th^0.25. From above relationship, it is possible to predict the particle size of submicron magnesium powders prepared by PWD.