Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Mechanical Synthesis and Rapid Consolidation of Nanostructured W-Al2O3 Composite

  • Lee, BooRak (Department of Advanced Materials Engineering, Korea Polytechnic University) ;
  • Jeong, GeolChae (Department of Advanced Materials Engineering, Korea Polytechnic University) ;
  • Park, GeunO (Division of Advanced Materials Engineering, the Research Center of Hydrogen Fuel Cell, Chonbuk National University) ;
  • Shon, In-Jin (Division of Advanced Materials Engineering, the Research Center of Hydrogen Fuel Cell, Chonbuk National University)
  • Received : 2018.05.10
  • Accepted : 2018.05.28
  • Published : 2018.06.27
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Abstract

Recently, the properties of nanostructured materials as advanced engineering materials have received great attention. These properties include fracture toughness and a high degree of hardness. To hinder grain growth during sintering, it is necessary to fabricate nanostructured materials. In this respect, a high-frequency induction-heated sintering method has been presented as an effective technique for making nanostructured materials at a lower temperature in a very short heating period. Nanopowders of W and $Al_2O_3$ are synthesized from $WO_3$ and Al powders during high-energy ball milling. Highly dense nanostructured $W-Al_2O_3$ composites are made within three minutes by high-frequency induction-heated sintering method and materials are evaluated in terms of hardness, fracture toughness, and microstructure. The hardness and fracture toughness of the composite are $1364kg/mm^2$ and $7.1MPa{\cdot}m^{1/2}$, respectively. Fracture toughness of nanostructured $W-Al_2O_3$ is higher than that of monolithic $Al_2O_3$. The hardness of this composite is higher than that of monolithic W.

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References

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