Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Densification of Reaction Bonded Silicon Nitride with the Addition of Fine Si Powder - Effects on the Sinterability and Mechanical Properties

  • Lee, Sea-Hoon (Engineering Ceramics Research Group, Korea Institute of Materials Science) ;
  • Cho, Chun-Rae (Engineering Ceramics Research Group, Korea Institute of Materials Science) ;
  • Park, Young-Jo (Engineering Ceramics Research Group, Korea Institute of Materials Science) ;
  • Ko, Jae-Woong (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 : 2013.05.09
  • Accepted : 2013.05.20
  • Published : 2013.05.31
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Abstract

The densification behavior and strength of sintered reaction bonded silicon nitrides (SRBSN) that contain $Lu_2O_3-SiO_2$ additives were improved by the addition of fine Si powder. Dense specimens (relative density: 99.5%) were obtained by gas-pressure sintering (GPS) at $1850^{\circ}C$ through the addition of fine Si. In contrast, the densification of conventional specimens did not complete at $1950^{\circ}C$. The fine Si decreased the onset temperature of shrinkage and increased the shrinkage rate because the additive helped the compaction of green bodies and induced the formation of fine $Si_3N_4$ particles after nitridation and sintering at and above $1600^{\circ}C$. The amount of residual $SiO_2$ within the specimens was not strongly affected by adding fine Si powder because most of the $SiO_2$ layer that had formed on the fine Si particles decomposed during nitridation. The maximum strength and fracture toughness of the specimens were 991 MPa and $8.0MPa{\cdot}m^{1/2}$, respectively.

Keywords

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