초고압 성형을 통한 Mo 나노 분말의 치밀화

안치형; 최원준; 박천웅; 이승영; 김영도

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자료유형: 학술저널

저자정보: 안치형 (한양대학교 신소재공학과) 최원준 (한양대학교 신소재공학과) 박천웅 (한양대학교 신소재공학과) 이승영 (한양대학교 신소재공학과) 김영도 (한양대학교 신소재공학과)

저널정보: 한국재료학회 한국재료학회지 한국재료학회지 제28권 제3호

발행연도: 2018.1

수록면: 166 - 173 (8page)

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Molybdenum (Mo) is one of the representative refractory metals for its high melting point, superior thermal conductivity, low density and low thermal expansion coefficient. However, due to its high melting point, it is necessary for Mo products to be fabricated at a high sintering temperature of over $1800-2000^{\circ}C$. Because this process is expensive and inefficient, studies to improve sintering property of Mo have been researched actively. In this study, we fabricated Mo nanopowders to lower the sintering temperature of Mo and tried to consolidate the Mo nanopowders through ultra high pressure compaction. We first fabricated Mo nanopowders by a mechano-chemical process to increase the specific surface area of the Mo powders. This process includes a high-energy ball milling step and a reduction step in a hydrogen atmosphere. We compacted the Mo nanopowders with ultra high pressure by magnetic pulsed compaction (MPC) before pressureless sintering. Through this process, we were able to improve the green density of the Mo compacts by more than 20 % and fabricate a high density Mo sintered body with more than a 95 % sintered density at relatively low temperature.

#molybdenum #nanopowders #magnetic pulsed compaction #ultra high pressure compaction #densification

참고문헌 (21)

참고문헌 신청

Y. M. Kim / 2007 / J. Kor. Powd. Met. Inst. 14:221

E. R. Braithwaite / 1994 / Molybdenum: An Outline of its Chemistry and Uses / Elsevier

T. S. Srivatsan / 2001 / Powder Technol. 114:136

0000 / About Molybdenum materials. PLANSEE Home Page

E. F. Baroch / 1991 / Adv. Powder Metall. 5:321

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