Journal of Ocean Engineering and Technology (한국해양공학회지)

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

$Y_3Al_5O_{12}$ 첨가가 질화규소 세라믹스의 제조 및 그 기계적 특성에 미치는 영향

  • Noh, Sang-Hoon (Department of Materials Science and Engineering, Graduate School of Pukyong National University) ;
  • Moon, Chang-Kwon (Division of Materials Science and Engineering, Pukyong National University) ;
  • Jeong, Hae-Yong (Division of Materials Science and Engineering, Pukyong National University) ;
  • Seo, Won-Chan (Division of Materials Science and Engineering, Pukyong National University) ;
  • Yoon, Han-Ki (Department of Mechanical Engineering, Dong-Eui University) ;
  • Kim, Bu-Ahn (Division of Materials Science and Engineering, Pukyong National University)
  • 노상훈 (부경대학교 신소재공학부 대학원) ;
  • 문창권 (부경대학교 신소재공학부) ;
  • 정해용 (부경대학교 신소재공학부) ;
  • 서원찬 (부경대학교 신소재공학부) ;
  • 윤한기 (동의대학교 기계공학과) ;
  • 김부안 (부경대학교 신소재공학부)
  • Published : 2007.12.31
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Abstract

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

Keywords

References

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