Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Densification of Al2O3 Nanopowder by Magnetic Pulsed Compaction and Their Properties

자기펄스 가압성형법에 의한 알루미나 나노분말의 치밀화 및 특성 평가

  • Kang, R.C. (Division of Advanced Materials Engineering, Kongju National University) ;
  • Lee, M.K. (Nuclear Materials Research Division, Korea Atomic Energy Research Institute) ;
  • Kim, W.W. (Nuclear Materials Research Division, Korea Atomic Energy Research Institute) ;
  • Rhee, C.K. (Nuclear Materials Research Division, Korea Atomic Energy Research Institute) ;
  • Hong, S.J. (Division of Advanced Materials Engineering, Kongju National University)
  • 강래철 (공주대학교 신소재공학부) ;
  • 이민구 (한국원자력연구원 재료연구부) ;
  • 김홍회 (한국원자력연구원 재료연구부) ;
  • 이창규 (한국원자력연구원 재료연구부) ;
  • 홍순직 (공주대학교 신소재공학부)
  • Published : 2008.02.28
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Abstract

This article presents the challenges toward the successful consolidation of $Al_2O_3$ nanopowder using magnetic pulsed compaction (MPC). In this research the ultrafine-structured $Al_2O_3$ bulks have been fabricated by the combined application of magnetic pulsed compaction (MPC) and subsequent sintering, and their properties were investigated. The obtained density of $Al_2O_3$ bulk prepared by the combined processes was increased with increasing MPC pressure from 0.5 to 1.25 GPa. Relatively higher hardness and fracture toughness in the MPCed specimen at 1.25 GPa were attributed to the retention of the nanostructure in the consolidated bulk without cracks. The higher fracture toughness could be attributed to the crack deflection by homogeneous distribution and the retention of nanostructure, regardless of the presence of porosities. In addition, the as consolidated $Al_2O_3$ bulk using magnetic pulsed compaction showed enhanced breakdown voltage.

Keywords

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