Preparation of silicon oxycarbide glass fibers from organically modified silicates

摘要

Silicon oxycarbide glass fibers have been successfully drawn from organically modified silicates (ORMOSILs) by the sol-gel method. The gel fibers were drawn from a precursor composed of tetraethyl orthosilicate (TEOS) and polydimethyl siloxane (PDMS) with different weight fraction. The organics in the fiber underwent decomposition to at temperatures higher than 300℃. The existence of oxycarbide phases were detected using infrared spectroscopy and solid state ~(29)Si NMR and was found in the fibers with heating temperatures higher than 700℃ in nitrogen atmosphere. X-ray powder diffraction patterns showed that the fibers were still amorphous even after heat treatment at 1000℃ for one hour.