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http://dx.doi.org/10.4191/kcers.2011.48.5.335

Effects of Hot Pressing Condition on the Properties of SiCf/SiC Composites  

Noviyanto, Alfian (School of Materials Science and Engineering, Yeungnam University)
Yoon, Dang-Hyok (School of Materials Science and Engineering, Yeungnam University)
Publication Information
Journal of the Korean Ceramic Society / v.48, no.5, 2011 , pp. 335-341 More about this Journal
Abstract
Continuous SiC fiber-reinforced SiC-matrix composites ($SiC_f$/SiC) had been fabricated by electrophoretic infiltration combined with ultrasonication. Nano-sized ${\beta}$-SiC added with 12 wt% of $Al_2O_3-Y_2O_3$ additive and Tyranno$^{TM}$-SA3 fabric were used as a matrix phase and fiber reinforcement, respectively. After hot pressing at 5 different conditions, the density, microstructure and mechanical properties of $SiC_f$/SiC were characterized. Hot pressing at relatively severe conditions, such as $1750^{\circ}C$ for 1 and 2 h, resulted in a brittle fracture behavior due to the strong fiber-matrix interface in spite of their high flexural strength. On the other hand, toughened $SiC_f$/SiC composite could be achieved by hot pressing at milder condition because of the formation of weak interface in spite of the decreased flexural strength. These results proposed the importance of weak fiber-matrix interface in the fabrication of ductile $SiC_f$/SiC composite.
Keywords
$SiC_f$/SiC composite; Electrophoretic deposition; Hot press; Zeta potential; Mechanical properties;
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