| 탄소섬유 강화 반응소결 탄화규소의 탄소섬유 첨가량에 따른 기계적 특성 변화 |
| 윤성호, 양진오, 조영철, 박상환 |
| 한국과학기술연구원 계면엔지니어링연구센터 |
| Variation of Mechanical Properties by Carbon Fiber Volume Percent of Carbon Fiber Reinforced Reaction Bonded SiC |
| Sung-Ho Yun, Jin-Oh Yang, Young-Chul Cho, Sang-Whan Park |
| Interfacial Engineering Research Center, Korea Institute of Science and Technology |
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| ABSTRACT |
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The composite added with surface-coated chopped carbon fiber showed the microstructure of a 3 dimensional discretional arrangements. The fiber reinforced reaction bonded silicon carbide composite, containing the 50 vol% carbon fiber, showed the porosity of < 1 vol%, 3-point bending strength value of 250MPa and fracture toughness of 4.5 $MPa{cdot}m^{1/2}$. As the content of carbon fiber was increased from 0 vol% to 50 vol% in the composite, fracture strength was decreased due to the increase of carbon fiber, which has a less strength than SiC and molten Si. On the other hand, the fracture toughness was increased with increasing the amount of carbon fiber. According to the polished microstructure, carbon fiber was shown to have a random 3 dimensional arrangement. Moreover, the fiber pull-out phenomenon was observed with the fractured surface, which can explain the increased fracture toughness of the composite containing high content of carbon fiber. |
| Key words:
RBSC, SiSiC, Fiber reinforced, Carbon fiber, Molten silicon |
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