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기존 세미나
(NSI Seminar) Hybrid Composite Materials with Heat-directed Property
Hybrid Composite Materials with Heat-directed Property : from Concepts to Potential Applications
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■ 연 사 : Mohamed S. Aly-Hassan (President and CEO, Hassan Associatates Co. Ltd., Researcher, ISAS, Japan Aerospace Exploration Agency)
■ 일 시 : 2008년 10월 29일 (수) 4:00-5:00
■ 장 소 : 서울대학교 39동 131호 나노응용시스템연구센터 회의실
■ 주 최 : 서울대학교 나노응용시스템연구센터
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■ Abstract
Recently, increasing demands for smarter and smaller products calls for the development of multifunctional composites. These materials are used not only as structural materials but also satisfy the needs for additional functionalities such as thermal, electrical, magnetic, optical, chemical, biological, etc. Therefore, Kyoto Institute of Technology and Japan Exploration Agency has been introduced novel multifunctional composite materials can help with both sides of the equation of consumption of energy and environment. These composites have additional thermal functionality, called heat-directed property. This distinctive property can be attained by varying the in-plane thermal conductivity of the composites. Two novel techniques were adopted to fabricate continuously woven carbon fiber reinforced polymer matrix composites, CFRP, and unidirectional carbon/carbon composites with heat-directed property. In the first technique, changing the in-plane thermal conductivity of the composites materials functionally was achieved by dispersing highly heat-conductive materials such as carbon nanotubes (CNTs) functionally throughout the matrix of the composites. While in the second technique, changing the inplane thermal conductivity of the material functionally was achieved by using hybrid carbon fibers (Pitch-based and PAN-based carbon fibers with thermal conductivity of 320 and 6.3 W/m.k, respectively) in the same prepreg of the carbon/carbon composites. These experimental results and FEM simulations suggested that the exceptional heat-directed property can play a significant performance improvement in heat transfer process along the in-plane of the materials and decreasing the thermal stresses of the structures as well as helping to decrease the heating up of the Earth, global warming, due to the escaped heat of many engineering applications. The research of these novel composites has grown to have different composite systems with different micro carbon fibers (PAN-based and Pitch based), different matrix types (epoxy, phenolic and carbon) and different carbon nanotubes/nanofibers as fillers in the matrix. Such composite systems can be promising candidates for heat transfer applications especially when the efficient consumption of the limited amount of energy and the light weight are required. Finally, we can say clearly these novel composite materials can offer sustainable solutions for the hot structures problems, such as improving the heat transfer efficiency, saving energy and reducing the thermal stresses, etc.
■ 문의
정진경 (Tel : 880-8285 / hanbunzzm@snu.ac.kr) 나노응용시스템연구센터 행정실
――――――――――――――――――――――――――――――――――――――――――――
■ 연 사 : Mohamed S. Aly-Hassan (President and CEO, Hassan Associatates Co. Ltd., Researcher, ISAS, Japan Aerospace Exploration Agency)
■ 일 시 : 2008년 10월 29일 (수) 4:00-5:00
■ 장 소 : 서울대학교 39동 131호 나노응용시스템연구센터 회의실
■ 주 최 : 서울대학교 나노응용시스템연구센터
――――――――――――――――――――――――――――――――――――――――――――
■ Abstract
Recently, increasing demands for smarter and smaller products calls for the development of multifunctional composites. These materials are used not only as structural materials but also satisfy the needs for additional functionalities such as thermal, electrical, magnetic, optical, chemical, biological, etc. Therefore, Kyoto Institute of Technology and Japan Exploration Agency has been introduced novel multifunctional composite materials can help with both sides of the equation of consumption of energy and environment. These composites have additional thermal functionality, called heat-directed property. This distinctive property can be attained by varying the in-plane thermal conductivity of the composites. Two novel techniques were adopted to fabricate continuously woven carbon fiber reinforced polymer matrix composites, CFRP, and unidirectional carbon/carbon composites with heat-directed property. In the first technique, changing the in-plane thermal conductivity of the composites materials functionally was achieved by dispersing highly heat-conductive materials such as carbon nanotubes (CNTs) functionally throughout the matrix of the composites. While in the second technique, changing the inplane thermal conductivity of the material functionally was achieved by using hybrid carbon fibers (Pitch-based and PAN-based carbon fibers with thermal conductivity of 320 and 6.3 W/m.k, respectively) in the same prepreg of the carbon/carbon composites. These experimental results and FEM simulations suggested that the exceptional heat-directed property can play a significant performance improvement in heat transfer process along the in-plane of the materials and decreasing the thermal stresses of the structures as well as helping to decrease the heating up of the Earth, global warming, due to the escaped heat of many engineering applications. The research of these novel composites has grown to have different composite systems with different micro carbon fibers (PAN-based and Pitch based), different matrix types (epoxy, phenolic and carbon) and different carbon nanotubes/nanofibers as fillers in the matrix. Such composite systems can be promising candidates for heat transfer applications especially when the efficient consumption of the limited amount of energy and the light weight are required. Finally, we can say clearly these novel composite materials can offer sustainable solutions for the hot structures problems, such as improving the heat transfer efficiency, saving energy and reducing the thermal stresses, etc.
■ 문의
정진경 (Tel : 880-8285 / hanbunzzm@snu.ac.kr) 나노응용시스템연구센터 행정실