Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Fabrication of Nanocrystalline Co-Al2O3 from Mechanically Synthesized Powders by Rapid Sintering

기계적으로 합성한 분말로부터 급속 소결에 의한 나노 구조의 Co-Al2O3 복합재료 제조

  • Park, Na-Ra (Division of Advanced Materials Engineering, the Research Center of Advanced materials Development, Chonbuk National University) ;
  • Shon, In-Jin (Division of Advanced Materials Engineering, the Research Center of Advanced materials Development, Chonbuk National University)
  • 박나라 (전북대학교 신소재공학부 신소재개발연구소) ;
  • 손인진 (전북대학교 신소재공학부 신소재개발연구소)
  • Received : 2012.06.11
  • Published : 2012.12.25
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Abstract

Nano-sized Co and $Al_2O_3$ powders were successfully synthesized from $3/4Co_3O_4$ and 2Al by high-energy ball milling. A dense nanocrystalline $2.25Co-Al_2O_3$ composite was consolidated from mechanically synthesized powders by the pulsed current activated sintering (PCAS) method within 2 min. Consolidation was accomplished under the combined effects of a pulsed current and mechanical pressure. A dense $2.25Co-Al_2O_3$ with relative density of up to 95% was produced under simultaneous application of a 80 MPa pressure and a pulsed current of 2800 A. The fracture toughness and hardness of the $2.25Co-Al_2O_3$ composite were $8MPa{\cdot}m^{1/2}$, $870kg/mm^2$, respectively.

Keywords

Acknowledgement

Supported by : 한국연구재단, 한국에너지평가원(KETEP)

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