폴리카보실란으로부터 제조된 SiC 기반 세라믹 섬유의 유연성

• Published in: 한국섬유공학회지 Vol. 56; no. 5; pp. 327 - 333
• Main Authors: 주영준, Young Jun Joo, 조광연, Kwang Youn Cho
• Format: Journal Article
• Language: Korean
• Published: 한국섬유공학회 31.10.2019
• Subjects: cross-linking; flexibility; oxidation curing; PCS fiber; SiC fiber; 섬유공학; flexibility; oxidation curing; cross-linking; PCS fiber; SiC fiber
• ISSN: 1225-1089; 2288-6419

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.