Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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The Effect of Al2O3 addition on the Characteristics of Sintering Behavior, Phase Transformation and Mechanical Properties of Spark Plasma Sintered Si3N4 Ceramics

알루미나 첨가에 의한 질화규소의 방전 플라즈마 소결 거동과 상전이 특성 및 기게적 특성에 미치는 영향

  • Chae, Jae-Hong (Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Dae-Gean (Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Kyoung-Hun (Korea Institute of Ceramic Engineering and Technology) ;
  • Park, Joo-Seok (Korea Institute of Ceramic Engineering and Technology) ;
  • Ahn, Jong-Pil (Korea Institute of Ceramic Engineering and Technology) ;
  • Sim, Kwang-Bo (Department of Materials Science and Engineering, Hanyang University)
  • Published : 2008.02.29
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Abstract

Silicon nitride($Si_3N_4)$ is one of the most widely used structural ceramic materials. However silicon nitride is difficult to sinter because of its strong covalent bonding characteristics. In this study, $Si_3N_4$ ceramics were fabricated by spark plasma sintering process with $Y_2O_3$ and $Al_2O_3$ addition to improve the sinterability and the mechanical properties and their phase transformation behavior, microstructure and mechanical properties were evaluated. Fully densified $Si_3N_4$ ceramics could be obtained by spark plasma sintering process at a lower temperature than conventional sintering method. The formation of network microstructure was affected by the addition of $Al_2O_3$ because it could accelerate a to ${\alpha}$ to ${\beta}$ phase transformation of $Si_3N_4$. As a result, the mechanical properties depended on amounts of $Al_2O_3$ addition. The hardness value increased with increasing ${\alpha}$-phase fraction, but fracture toughness value increase with increasing ${\beta}$-phase fraction.

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References

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