한국섬유공학회

Silicon carbide (SiC)-based ceramic fibers are converted from polycarbosilane (PCS) as a ceramic precursor. They are mainly fabricated via processes such as melt-spinning, oxidation-curing, and pyrolysis. The oxidation-curing method not only increases the ceramic yield, but also affects the flexibility of the ceramic fiber as it induces cross-linking in the PCSs. In this study, PCS was oxidation-cured, which depended on the temperature and time variables albeit not the effect of heating rate, and then converted to SiC-based ceramic fiber through pyrolysis. The cured PCS fibers were converted to circular ceramic fibers when the reaction degree (ΔSiH) increased to approximately 0.97; however, the converted SiC-based ceramic fibers showed low flexibility. After the oxidation-curing at 200 °C for 50 min, oxygen content diffused into the core of the PCS fibers. As a result, the reaction degree (ΔSiH) increased significantly , and flexible SiC-based ceramic fibers were fabricated.

Keywords : PCS fiber, oxidation curing, cross-linking, SiC fiber, flexibility

DOI : https://doi.org/10.12772/TSE.2019.56.327

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