Metals and materials international

The Korean Institute of Metals and Materials (대한금속재료학회)
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Properties and Pulsed Current Activated Consolidation of Nanostuctured $MgSiO_3-MgAl_2O_4$ Composites

  • Shon, In-Jin (Chonbuk National University, Division of Advanced Materials Engineering and the Research Center of Advanced Materials Development, Engineering College) ;
  • Du, Song-Lee (Chonbuk National University, Division of Advanced Materials Engineering and the Research Center of Advanced Materials Development, Engineering College) ;
  • Doh, Jung-Mann (Korea Institute of Science and Technology, Interface Control Research Center) ;
  • Yoon, Jin-Kook (Korea Institute of Science and Technology, Interface Control Research Center)
  • Published : 2013.09.20
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Abstract

Nanocrystalline materials have received much attention as advanced engineering materials with improved physical and mechanical properties. As nanomaterials possess high strength, high hardness, excellent ductility and toughness, undoubtedly, more attention has been paid for the application of nanomaterials. Nanopowders of MgO, $Al_2O_3$ and $SiO_2$ were made by high energy ball milling. The simultaneous synthesis and consolidation of nanostuctured $MgAl_2O_4-MgSiO_3$ composites from milled 2MgO, $Al_2O_3$ and $SiO_2$ powders was investigated by the pulsed current activated sintering process. The advantage of this process is that it allows very quick densification to near theoretical density and inhibition of grain growth. Highly dense nanostructured $MgAl_2O_4-MgSiO_3$ composites were produced with a simultaneous application of 80 MPa pressure and a pulsed current of 2000A within 1min. The fracture toughness of $MgAl_2O_4-Mg_2SiO_4$ composites sintered from $60mol%MgO-20mol%Al_2O_3-20mol%SiO_2$ powders milled for 4 h was $3.2MPa{\cdot}m^{1/2}$. The fracture toughness of $MgAl_2O_4-MgSiO_3$ composite is higher than that of monolithic $MgAl_2O_4$.

Keywords

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