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Characteristic Studies on Electro-Discharge-Sintering of Ti5Si3 Powder Synthesized by Mechanical Alloying  

Cheon, Yeon-wuk (Department of Advanced Materials Engineering, Sejong University)
Cho, Yu-jung (Department of Advanced Materials Engineering, Sejong University)
Kang, Tae-ju (Department of Advanced Materials Engineering, Sejong University)
Kim, Jung-yeul (Department of Semiconductor & Electronics Engineering, Uiduk University)
Park, Jun-sik (Department of Materials Engineering, Hanbat University)
Byun, Chang-sup (Department of Materials Engineering, Hanbat University)
Lee, Sang-ho (Department of Materials Engineering, Hanbat University)
Lee, Won-hee (Department of Advanced Materials Engineering, Sejong University)
Publication Information
Korean Journal of Metals and Materials / v.47, no.10, 2009 , pp. 660-666 More about this Journal
Abstract
The consolidation of mechanical alloyed $Ti_5Si_3$ powder by electro-discharge-sintering has been investigated. A single pulse of 2.5 to 8.0 kJ/0.34 g was applied to each powder mixture using 300 and $450{\mu}F$ capacitors. A bulk-like solid with $Ti_5Si_3$ phase has been successfully fabricated by the discharge with an input energy of more than 2.5 kJ in less than $160{\mu}sec$. Micro-Vickers hardness was found to be higher than 1350, which is significantly higher than that of a conventional high temperature sintered sample. The formation of $Ti_5Si_3$ and consolidation occurred through a fast solid state diffusion reaction.
Keywords
titanium-silicide; mechanical alloying; electro-discharge-sintering; vickers hardness; phase transformation;
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