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J. Ocean Eng. Technol. 2007;21(6):95-100.    

The Effects of $Y_3Al_5O_{12}$ on the Mechanical Properties of Silicon Nitride
Noh Sang-Hoon,Moon Chang-Kwon,Jeong Hae-Yong,Seo Won-Chan,Yoon Han-Ki,Kim Bu-Ahn
Department of Materials Science and Engineering Graduate School of Pukyong National University,Division of Materials Science and Engineering Pukyong National University,Division of Materials Science and Engineering Pukyong National University,Division
$Y_3Al_5O_{12}$ 첨가가 질화규소 세라믹스의 제조 및 그 기계적 특성에 미치는 영향
노상훈,문창권,정해용,서원찬,윤한기,김부안
부경대학교 신소재공학부 대학원,부경대학교 신소재공학부,부경대학교 신소재공학부,부경대학교 신소재공학부,동의대학교 기계공학과,부경대학교 신소재공학부
© 2007 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Silicon nitride, Sintering additive, Hot press, Flexural strength, High temperature strength
핵심용어: 질화규소, 소결조제, 일축가압, 굽힘강도, 고온강도
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.


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