| SiCf/SiC 복합체의 특성에 미치는 열간가압소결 조건의 영향 |
| 노비얀토 알피안, 윤당혁 |
| 영남대학교 신소재공학부 |
| Effects of Hot Pressing Condition on the Properties of SiCf/SiC Composites |
| Alfian Noviyanto, Dang-Hyok Yoon |
| School of Materials Science and Engineering, Yeungnam University |
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| ABSTRACT |
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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. |
| Key words:
$SiC_f$/SiC composite, Electrophoretic deposition, Hot press, Zeta potential, Mechanical properties |
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