대한금속재료학회지 (Korean Journal of Metals and Materials)

  • 제47권1호
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  • Pages.50-58
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  • 2009
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  • 1738-8228(pISSN)
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  • 2288-8241(eISSN)
대한금속재료학회 (The Korean Institute of Metals and Materials)
권호 표지

Carbon Nanotube로 강화된 알루미나 기지 복합재료의 제조 및 파괴특성

Fabrication and Fracture Properties of Alumina Matrix Composites Reinforced with Carbon Nanotubes

  • 김성완 (부산대학교 재료공학부) ;
  • 정원섭 (부산대학교 재료공학부) ;
  • 손기선 (순천대학교 재료공학부) ;
  • 손창영 (포항공과대학 항공재료연구센터) ;
  • 이성학 (포항공과대학 항공재료연구센터)
  • Kim, Sung Wan (School of Materials Science and Engineering Pusan National University) ;
  • Chung, Won Sub (School of Materials Science and Engineering Pusan National University) ;
  • Sohn, Kee-Sun (Department of Materials Science and Metallurgical Engineering Sunchon National University) ;
  • Son, Chang-Young (Center for Advanced Aerospace Materials Pohang University of Science and Technology) ;
  • Lee, Sunghak (Center for Advanced Aerospace Materials Pohang University of Science and Technology)
  • 투고 : 2008.09.10
  • 발행 : 2009.01.28
⟨ 이전 논문 다음 논문 ⟩

초록

In this study, alumina matrix composites reinforced with carbon nanotubes (CNTs) were fabricated by ultrasonic dispersion, ball milling, mixing, compaction, and sintering processes, and their relative density, electrical resistance, hardness, flexure strength, and fracture toughness were evaluated. 0~3 vol.% of CNTs were relatively homogeneously dispersed in the composites in spite of the existence of some pores. The three-point bending test results indicated that the flexure strength increased with increasing volume fraction of CNTs, and reached the maximum when the CNT fraction was 1.5 vol.%. The fracture toughness increased as the CNT fraction increased, and the fracture toughness of the composite containing 3 vol.% of CNTs was higher by 40% than that of the monolithic alumina. According to observation of the crack propagation path after the indentation fracture test, a new toughening mechanism of grain interface bridging-induced CNT bridging was suggested to explain the improvement of fracture toughness in the alumina matrix composites reinforced with CNTs.

키워드

과제정보

연구 과제 주관 기관 : 한국과학재단

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