Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Development of CNT-dispersed Si3N4 Ceramics by Adding Lower Temperature Sintering Aids

  • Matsuoka, Mitsuaki (Graduate School of Environment and Information Sciences, Yokohama National University) ;
  • Yoshio, Sara (Graduate School of Environment and Information Sciences, Yokohama National University) ;
  • Tatami, Junichi (Graduate School of Environment and Information Sciences, Yokohama National University) ;
  • Wakihara, Toru (Graduate School of Environment and Information Sciences, Yokohama National University) ;
  • Komeya, Katsutoshi (Graduate School of Environment and Information Sciences, Yokohama National University) ;
  • Meguro, Takeshi (Graduate School of Environment and Information Sciences, Yokohama National University)
  • Received : 2012.05.22
  • Accepted : 2012.07.16
  • Published : 2012.07.31
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Abstract

The study to give electrical conductivity by dispersing carbon nanotubes (CNT) into silicon nitride ($Si_3N_4$) ceramics has been carried out in recent years. However, the density and the strength of $Si_3N_4$ ceramics were degraded and CNTs disappeared after firing at high temperatures because CNTs prevent $Si_3N_4$ from densification and there is a possibility that CNTs react with $Si_3N_4$ or $SiO_2$. In order to suppress the reaction and the disappearance of CNTs, lower temperature densification is needed. In this study, $HfO_2$ and $TiO_2$ was added to $Si_3N_4-Y_2O_3-Al_2O_3$-AlN system to fabricate CNT-dispersed $Si_3N_4$ ceramics at lower temperatures. $HfO_2$ promotes the densification of $Si_3N_4$ and prevents CNT from disappearance. As a result, the sample by adding $HfO_2$ and $TiO_2$ fired at lower temperatures showed higher electrical conductivity and higher bending strength. It was also shown that the mechanical and electrical properties depended on the quantity of the added CNTs.

Keywords

References

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