Continuous SiC fiber is a kind of high–performance ceramic fiber that combines many advantages, such as high strength, high modulus, high hardness and low density. It has excellent mechanical properties, high–temperature and oxidation resistance, which could be applied as essential reinforcement in advanced ceramic matrix composites (CMCs) in the fields of aerospace and advanced weaponry. Melt–spinnable polytitanocarbosilane (PTCS) is an important precursor, which can be used to prepare continuous SiC fibers through a precursor–derived method. In this work, low–softening–point polycarbosilane (LPCS) and tetrabutyl titanate were used to prepare polytitanocarbosilane with a ceramic yield of 67.5 wt% at 1000 °C. FT–IR, TGA, GPC, 1H NMR, 29Si NMR, and elemental analysis were used to analyze the composition and structure of the PTCS precursor. Finally, Si–C–Ti–B fibers with an average tensile strength of 1.93 GPa were successfully prepared by melt spinning, pre–oxidation, pyrolysis, and high–temperature sintering of the PTCS precursor. The strength retention rates were 71.5% and 79.8% after heat treatment at 1900 °C and 2000 °C under an argon atmosphere for 1 h, respectively. The strength retention rates of Si–C–Ti–B fibers are higher than those of commercial Hi–Nicalon fibers, Tyranno ZMI fibers and Hi–Nicalon S fibers. This work can lay a theoretical foundation and technical support for developing high-performance SiC ceramic fibers containing titanium and their ceramic matrix composites.
SiC fibers have urgent application requirements under extreme conditions due to their excellent properties such as thermal stability, radiation resistance and high modulus. In this work, SiC fiber membranes with two-dimensional micro-nano fiber interwoven structures were synthesized by centrifugal spinning. TG results show that SiC fiber has good high-temperature resistance and oxidation resistance. There is no obvious damage to the SiC fiber membrane under the oxyacetylene flame heating at about 1450 °C. At heat treatment temperatures up to 2000 °C, the SiC fiber membrane still exhibits structural stability. The minimum diameter of SiC fibers is 0.7 μm. SiC fiber membranes exhibit superior mechanical and chemical stability under extreme temperature conditions. This work will help to prepare high-performance ceramic fiber membranes with different material systems.
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