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Preparation of Si-C-O Ceramic Fibers from Commercial Silicon Resin
H. Li, Y. Gou, H. Wang, K. Jian
Abstract
Si-C-O ceramic fibers were prepared from commercial silicon resin by means of melt spinning, UV curing and pyrolysis. The composition and structure of the precursors were characterized with FT-IR and NMR. Silicon resin exhibited excellent spinning performance for use as a precursor to prepare continuous fibers. UV irradiation was employed to complete the cross-linking of the green fibers, and the mechanism of the curing process was determined with FT-IR. After pyrolysis at 1 000 °C, Si-C-O ceramic fibers were obtained, which exhibited good flexibility with 7.5 μm in diameter and 0.8 GPa in tensile strength. The obtained fibers remained amorphous below 1 300 °C. When the temperature reached above 1 300 °C, SiC with a small crystal size appeared because of carbothermal reduction, and the fiber gradually lost mechanical strength owing to the pores caused by release of low-molecular-weight molecules such as CO, CO2 and SiO.
Keywords
Si-C-O ceramic fibers, silicon resin, precursor, low cost, UV curing
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