한국세라믹학회지 (Journal of the Korean Ceramic Society)

  • 제45권2호
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  • Pages.94-98
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  • 2008
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  • 1229-7801(pISSN)
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  • 2234-0491(eISSN)
한국세라믹학회 (The Korean Ceramic Society)
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알루미나 첨가에 의한 질화규소의 방전 플라즈마 소결 거동과 상전이 특성 및 기게적 특성에 미치는 영향

The Effect of Al2O3 addition on the Characteristics of Sintering Behavior, Phase Transformation and Mechanical Properties of Spark Plasma Sintered Si3N4 Ceramics

  • 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)
  • 발행 : 2008.02.29
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초록

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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참고문헌

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