SiC fibers containing Y and Al were prepared by sintering the amorphous KD-Y fibers at
different temperatures from 1200 to 1800 °C. The tensile strength of fibers increases when the sintering
temperature increases from 1200 to 1400 °C due to the dispersion strengthening of β-SiC microcrystal
and decreases to the lowest point when being sintered at 1600 °C, then rose again with the further increase
of temperature to 1800 °C. The tensile strength reached to 2.15 GPa. The oxygen content of KD-Y fibers
determined the properties of the sintered SiC fibers and sintering process. Through chemical vapor curing
(CVC), the oxygen content was controlled below 7.0 wt% and the tensile strength of KD-Y fibers reached
to 3.08 GPa. Further-more, the sintering process of KD-Y fibers was discussed and the grain size of β-SiC
grew up with the heat treatment temperature.