Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Microstructure and Properties of Cu Dispersed Al2O3 Nanocomposites Prepared by Pressureless Sintering

상압소결법으로 제조한 Cu 입자 분산 Al2O3 나노복합재료의 미세조직 및 특성

  • Lee, Kyong-Hwan (Division of Steel Industry, Shinsung University) ;
  • Oh, Sung-Tag (Department of Materials Science and Engineering, Seoul National University of Technology)
  • 이경환 (신성대학 제철산업과) ;
  • 오승탁 (서울산업대학교 신소재공학과)
  • Published : 2009.08.28
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Abstract

The pressureless sintering behavior of $Al_2O_3$/Cu powder mixtures, prepared from $Al_2O_3$/CuO and $Al_2O_3$/Cu-nitrate, has been investigated. Microstructural observation revealed that $Al_2O_3$ powders with nano-sized Cu particles could be synthesized by hydrogen reduction method. The specimens, pressureless-sintered at $1400^{\circ}C$ for 4 min using infrared heating furnace with the heating rate of $200^{\circ}C$/min, showed the relative density of above 90%. Maximum hardness of 16.1 GPa was obtained in $Al_2O_3$/MgO/Cu nanocomposites. The nanocomposites exhibited the enhanced fracture toughness of 4.3-5.7 $MPa{\cdot}m^{1/2}$, compared with monolithic $Al_2O_3$. The mechanical properties were discussed in terms of microstructural characteristics.

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