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The Effects of $Y_3Al_5O_{12}$ on the Mechanical Properties of Silicon Nitride  

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)
Publication Information
Journal of Ocean Engineering and Technology / v.21, no.6, 2007 , pp. 95-100 More about this Journal
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
Silicon nitride; Sintering additive; Hot press; Flexural strength; High temperature strength;
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