Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Sintered-reaction Bonded Silicon Nitride Densified by a Gas Pressure Sintering Process - Effects of Rare Earth Oxide Sintering Additives

  • Lee, Sea-Hoon (Engineering Ceramics Research Group, Korea Institute of Materials Science) ;
  • Ko, Jae-Woong (Engineering Ceramics Research Group, Korea Institute of Materials Science) ;
  • Park, Young-Jo (Engineering Ceramics Research Group, Korea Institute of Materials Science) ;
  • Kim, Hai-Doo (Engineering Ceramics Research Group, Korea Institute of Materials Science) ;
  • Lin, Hua-Tay (Materials Science and Technology Division, Oak Ridge National Laboratory) ;
  • Becher, Paul (Materials Science and Technology Division, Oak Ridge National Laboratory)
  • Received : 2012.05.22
  • Accepted : 2012.07.09
  • Published : 2012.07.31
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Abstract

Reaction-bonded silicon nitrides containing rare-earth oxide sintering additives were densified by gas pressure sintering. The sintering behavior, microstructure and mechanical properties of the resultant specimens were analyzed. For that purpose, $Lu_2O_3-SiO_2$ (US), $La_2O_3$-MgO (AM) and $Y_2O_3-Al_2O_3$ (YA) additive systems were selected. Among the tested compositions, densification of silicon nitride occurred at the lowest temperature when using the $La_2O_3$-MgO system. Since the $Lu_2O_3-SiO_2$ system has the highest melting temperature, full densification could not be achieved after sintering at $1950^{\circ}C$. However, the system had a reasonably high bending strength of 527 MPa at $1200^{\circ}C$ in air and a high fracture toughness of 9.2 $MPa{\cdot}m^{1/2}$. The $Y_2O_3-Al_2O_3$ system had the highest room temperature bending strength of 1.2 GPa.

Keywords

References

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