(1) Department of Advanced Materials Engineering, Sungkyunkwan University, 300 Chunchun-dong, Changan-ku, 440-746 Suwon, Korea;(2) Department of Ceramic Engineering, Myongji University, San 38-2 Nam-dong, 449-728 Yongin, Korea
Abstract:
Activated carbon fiber composite (ACFC) was reacted with SiO vapor to prepare SiC fibers containing nanopores. The SiC fibers obtained were not oxidation resistant, showing nearly complete oxidation at 1000°C after about 25 hr in air, though the oxidation product was amorphous silica which was generally considered to be oxidation resistant. The poor oxidation resistance was attributed to highly porous, amorphous SiO2 formation on the inherently highly porous SiC fibers. Interconnected micropores inside the fibers rendered the fibers easily oxidizable.
