SiC fiber is an important bearing part of SiCf/SiC composite,and its temperature resistance directly affects the practical application of SiC fiber.The monofilament tensile Strength and tow tensile force test results show that the strength of SiC single fiber remains above 2.7 GPa and the tensile force of bundle is above 170 N in the air and without protection at 800℃,and there is no obvious change with the extension of time.When the temperature rises to 1000℃,the strength of monofilament decreases to 2.0 GPa and the tensile force of bundle fi-ber decreases to 159 N.After more than 1200℃,the fiber oxidation is obvious,and there is no long-term appli-cation ability.The SEM and EDS results showed that the surface of the fibers had different degrees of oxidation at different temperatures,and the higher the temperature was,the higher the oxygen content of the fibers was.When the temperature exceeded 1400℃,the"core skin"structure of the fibers appeared and fell off,and the oxidation was serious and complete failure.
SiC fiberthe strength of single fiberbundle fiber tensile forcetemperature resistance
NETL
NSTL
万方数据
