Abstract
Amorphous Si–Ti–O–C ceramic fibers are prepared from organic precursor fibers by heat treatment above 1000°C. Small-angle X-ray scattering (SAXS) measurements have detected a structural change accompanying an increase in mechanical strength of the fibers arising from an increase in heat-treatment temperature. The scattering profiles of Si–Ti–O–C fibers heat treated at temperatures below 800°C differ from those heat-treated at higher temperatures above 1000°C. The former profiles are fit by Gaussian functions, while the latter profiles can be fitted using the Percus–Yevick model of particle scattering including the concept of a depleted zone. The SAXS measurements showed that structural changes occur over a length scale greater than 1.5 nm for fibers heat-treated at temperatures between 500°C and 1000°C.
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