전기방전에 의한 Ti3Al의 합성 및 소결 특성 연구

• Published in: 대한금속·재료학회지, 47(8) pp. 488 - 493
• Main Authors: 장형순, 조유정, 강태주, 김기범, 이원희
• Format: Journal Article
• Language: Korean
• Published: 대한금속·재료학회 01.08.2009
• Subjects: 재료공학
• ISSN: 1738-8228; 2288-8241

Direct syntheses of bulk Ti3Al via electro-discharge-sintering (EDS) of a stoichiometric elemental powder mixture were investigated. A capacitor bank of 450 μF was charged with three input energies, 0.5, 1.0, and 1.5 kJ. The charged capacitor bank was then instantaneously discharged through 0.3 g of a Ti-25.0 at.%Al powder mixture for consolidation. Complete phase transformation occurred in less than 200 μsec by the discharge and a bulk Ti3Al compact was obtained. Compared with consolidated samples fabricated by conventional methods such as high vacuum sintering and casting, the electro-discharge-sintered Ti3Al compact shows a very fine microstructure with a hardness value of 425 Hv. Electro-discharge-sintering under a N2 atmosphere successfully modified the surface Ti oxide of the Ti3Al compact into Ti nitride, which concurred with the synthesis and consolidation of Ti3Al. Complete conversion yielding a single phase Ti3Al is primarily dominated by the fast solid state diffusion reaction. KCI Citation Count: 8