Abstract
Silicon oxycarbide fibers have been prepared from vinyl trimethoxysilane (VTMS) by a modified sol-gel method and with secondary cellulose acetate (SCA) as the fiber-forming aid. Its main advantage over a normal sol-gel fiber processing is that the spinning dope remains spinnable for a long period of time. The effect of the pre-hydrolysis of VTMS on the dope spinnability is studied. At H2O/VTMS = 4, the resultant sol transforms into gel very quickly, unsuitable to obtain a spinnable dope; at H2O/VTMS = 2, too much un-reacted VTMS exists in the sol, making the extruded fiber difficult to solidify; at H2O/VTMS = 3, a dope with good spinnability, stability and high ceramic yield is obtainable. Pyrolysis at 1000∘C in argon/5% hydrogen results in silicon oxycarbide fibers with the maximum tensile strength (940.0 MPa), moderate Young’s modulus (63.2 GPa) and high carbon content (33.2%).
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Chen, L.F., Cai, Z.H., Zhou, W. et al. Preparation and properties of silicon oxycarbide fibers. J Mater Sci 40, 3497–3501 (2005). https://doi.org/10.1007/s10853-005-2855-1
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DOI: https://doi.org/10.1007/s10853-005-2855-1