Proceedings of the Korea Committee for Ocean Resources and Engineering Conference (한국해양공학회:학술대회논문집)

Korean Society of Ocean Engineers (한국해양공학회)
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The Effects of $Y_3Al_5O_{12}$ on the Mechanical Properties of Silicon Nitride

복산화물에 의한 질화규소 세라믹스의 제조와 그 기계적 특성

  • Noh, Sang-Hoon (Department of Materials Science and Engineering, Graduate School of Pukyong National University) ;
  • Kim, Bu-Ahn (Division of Materials Science and Engineering, Pukyong National University) ;
  • Jeong, Hae-Yong (Division of Materials Science and Engineering, Pukyong National University) ;
  • Yoon, Han-Ki (Department of Mechanical Engineering, Dong-Eui University)
  • 노상훈 (부경대학교 재료공학과 대학원) ;
  • 김부안 (부경대학교 신소재공학부) ;
  • 정해용 (부경대학교 신소재공학부) ;
  • 윤한기 (동의대학교 기계공학과)
  • Published : 2006.11.16
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Abstract

In the present work, silicon nitride was fabricated with $Y_3Al_5O_{12}$ as sintering additive and its mechanical properties were investigated. Silicon nitride with 3, 5, 7wt% of $Y_3Al_5O_{12}$ was prepared and sintered by a Hot Pressing (HP) technique at 1750, $1800^{\circ}C$ for 2 hours. The Process was fulfilled under different process pressures of 30, 45MPa respectively. Mechanical properties (density, strength, hardness, fracture toughness) were investigated as a function of $Y_3Al_5O_{12}$ contents in $Si_3N_4$. $Si_3N_4-Y_3Al_5O_{12}$ ceramics showed similar mechanical properties compared with $Si_3N_4-Y_2O_3-Al_2O_3$ ceramics. But its high temperature strength was higher than $Si_3N_4-Y_2O_3-Al_2O_3$ceramics considerably.

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