Nb-Si-B alloys with Nb-rich compositions are fabricated by spark plasma sintering for high-temperature structural applications. Three compositions are selected: 75 at% Nb (Nb0.7), 82 at% Nb (Nb1.5), and 88 at% Nb (Nb3), the atomic ratio of Si to B being 2. The microstructures of the prepared alloys are composed of Nb and T2 phases. The T2 phase is an intermetallic compound with a stoichiometry of Nb5Si3-xBx (0 ≤ x ≤ 2). In some previous studies, Nb-Si- B alloys have been prepared by spark plasma sintering (SPS) using Nb and T2 powders (SPS 1). In the present work, the same alloys are prepared by the SPS process (SPS 2) using Nb powders and hypereutectic alloy powders with composition 67at%Nb-22at%Si-11at%B (Nb67). The Nb67 alloy powders comprise T2 and eutectic (T2 + Nb) phases. The microstructures and hardness of the samples prepared in the present work have been compared with those previously reported; the samples prepared in this study exhibit finer and more uniform microstructures and higher hardness.

Abstract
1. 서 론
2. 실험
3. 결과 및 고찰
4. 결 론
References

• 조민호(강원대학교 신소재공학과) | Min-Ho Cho (Department of Materials Science and Engineering, Kangwon National University)
• 김성준(강원대학교 신소재공학과) | Sung-Jun Kim (Department of Materials Science and Engineering, Kangwon National University)
• 강현지(서울과학기술대학교 신소재공학과) | Hyun-Ji Kang (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
• 오승탁(서울과학기술대학교 신소재공학과) | Sung-Tag Oh (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
• 김영도(한양대학교 신소재공학부) | Young Do Kim (Division of Materials Science and Engineering, Hanyang University)
• 이성(국방과학연구소) | Seong Lee (Agency for Defence Development)
• 석명진(강원대학교 신소재공학과) | Myung Jin Suk (Department of Materials Science and Engineering, Kangwon National University) Corresponding Author