Porous SiO2/SiC Fiber Via Carbothermal-Reduction of Hybrid Fiber in Air Flows
Using tetraethoxysilane (TEOS) and novolac-PF as raw materials, SiO2/PF hybrid fibers were prepared via sol-gel associated with drawing process, and then sintered at different temperatures (500-1300 °C) under air atmosphere. The microstructure variation and reaction mechanism of the fiber were investigated by FT-IR, XRD, and SEM measurements. The results showed that the microstructure variation of the hybrid fiber was influenced greatly by sintering temperatures. When the sintering temperature was below 900 °C, the fibers were amorphous, and converted into porous SiO2/SiC fibers after being sintered at 1300 °C.
Zhong Cao, Yinghe He, Lixian Sun and Xueqiang Cao
Q. S. Song et al., "Porous SiO2/SiC Fiber Via Carbothermal-Reduction of Hybrid Fiber in Air Flows", Advanced Materials Research, Vols. 236-238, pp. 1492-1496, 2011