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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 허선철
- 발행연도
- 2016
- 저작권
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With the development of industry, materials having a high reliability of the high strength has been required. Copper utilized as an important resource with it''s ductility, good electrical and thermal conductivity in various fields is mainly used as the form of alloy. Carbon Nanotube (hereinafter"CNT") is applied in various fields for its superior electrical, mechanical and thermal characteristics.
In this study, composites were manufactured using Cu matrix that has a relatively weak strength than the CNT and CNT as the additive. Nano-copper powder(=100nm) was mixed with acid refined CNT(1wt%, 5wt% and 10wt%), and then dispersed for five hours at a speed of 500 rpm using a planetary ball-mill with zirconia balls(90g) and ethanol(20ml). For canning, the mixed powder was put in the billet using uniaxial pressure and billet vacuum was maintained through the degassign process. Extrusion was conducted after maintaining the temperature of the billet at 880for one hour by way of hot-extrusion and placing the billet in a 450container using 200 ton capacity hydraulic press. In the result of PSD measurement, the copper particle size was increased by about 13~28 times after ball-mill due to ductility characteristic of cooper. In the result of indentation measurement, hardness 239HV, tensile strength 350MPa and yield strength 1463.1MPa are showed in 10wt% specimen. In the result of wear test, it was confirmed that the wear is the lowest in the 5wt% specimen. As a result, Mechanical property values were increased in proportion to the fraction of the CNT.
In this study, composites were manufactured using Cu matrix that has a relatively weak strength than the CNT and CNT as the additive. Nano-copper powder(=100nm) was mixed with acid refined CNT(1wt%, 5wt% and 10wt%), and then dispersed for five hours at a speed of 500 rpm using a planetary ball-mill with zirconia balls(90g) and ethanol(20ml). For canning, the mixed powder was put in the billet using uniaxial pressure and billet vacuum was maintained through the degassign process. Extrusion was conducted after maintaining the temperature of the billet at 880for one hour by way of hot-extrusion and placing the billet in a 450container using 200 ton capacity hydraulic press. In the result of PSD measurement, the copper particle size was increased by about 13~28 times after ball-mill due to ductility characteristic of cooper. In the result of indentation measurement, hardness 239HV, tensile strength 350MPa and yield strength 1463.1MPa are showed in 10wt% specimen. In the result of wear test, it was confirmed that the wear is the lowest in the 5wt% specimen. As a result, Mechanical property values were increased in proportion to the fraction of the CNT.
목차
Ⅰ. 서론 11. 연구개요 및 배경 12. 연구목적 및 내용 3Ⅱ. 이론적배경 41. 탄소나노튜브 41) 탄소나노튜브의 종류 및 특성 52) 탄소나노튜브의 정제 및 분산 92. 나노금속분말 103. 복합재료 11Ⅲ 실험방법 131. 복합분말 제조 152. 캐닝공정 183. 열간 압출 방법 및 공정 214. 나노복합재의 관찰 및 물성 평가 24Ⅳ. 실험결과 및 고찰 281. 복합분말 제조 결과 282. 캐닝(canning) 충진 결과 323. 압출재의 특징 및 결과 331) 복합분말의 압출 특성 332) 미시적 조직 관찰 353) Indentation을 이용한 물성평가 384) 마모시험 결과 42Ⅴ. 결론 47참고 문헌 48
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