초고압 성형을 통한 Mo 나노 분말의 치밀화 (Densification of Mo Nanopowders by Ultra High Pressure Compaction)

서지정보

· 발행기관 : 한국재료학회
· 수록지 정보 : 한국재료학회지 / 28권 / 3호 / 166 ~ 173페이지
· 저자명 : 안치형, 최원준, 박천웅, 이승영, 김영도

초록

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 oC. 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.

영어초록

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 oC. 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.

참고자료

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