Study of online tensile properties for continuous ceramic fibers under high-temperature loads

In this study, a self-developed online test platform for high-temperature mechanical properties was utilized to test the tensile properties of three continuous ceramic fibers from room temperature to 1 000 degrees C. It was observed that the tensile strength of all tested continuous ceramic fibers decreased significantly with increasing temperature. Specifically, significant peeling of the surface organic coating from room temperature to 400 degrees C, inherent and newly formed defects exposed from 600 degrees C to 1 000 degrees C contributed to the decrease in tensile strength. More importantly, compared with room temperature, the strength of the silicon carbide fibers and the alumina fibers remained 29.7% and 20.2% respectively when stretched online at 1 000 degrees C, while the quartz fibers dropped to 4.3% dramatically. These findings contribute valuable data for the potential application of ceramic fiber filaments as flexible thermal protection materials.