Fabrication of continuous SiOC ceramic fibers by polyethylene oxide assisted sol-gel method

Continuous SiC fibers with excellent mechanical properties and high‐temperature resistance possess immense potential as reinforcements for aeroengines. In this work, we prepared functionalized boron nitride nanosheet (F‐BNNS) composite SiC (F‐BNNS/SiC) fibers by polymer‐derived method. Due to the existence of F‐BNNS, the F‐BNNS/SiC fibers demonstrate an improved tensile strength up to 2300 MPa, representing a 25% increase compared to the original SiC fibers. Furthermore, owing to the chemical bonds established between the F‐BNNS and the SiCxOy network, the decomposition of the SiCxOy amorphous phase and the crystallization of SiC at high temperatures is effectively suppressed. The F‐BNNS/SiC fibers exhibit improved high‐temperature resistance, maintaining a tensile strength of 720 MPa up to 1500°C, while the SiC fibers completely degraded under the same conditions. The successful preparation of BNNS/SiC fibers may offer new insights into the performance enhancement of advanced ceramic fibers.

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High-temperature resistance and thermal insulation performance of continuous SiMOC ceramic fibers fabricated by the modified sol-gel method combined with dry spinning

Wang,

Chen,

Ahmad

et al. 2024

Preprint

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Ceramic fibers are ideal candidates for high-temperature resistance material due to their excellent oxidation resistance, ablation resistance, and mechanical properties. In this study, precursor solutions of the continuous SiOC, and SiMOC (M = Al/Zr) ceramic fibers were prepared by a modified sol-gel method. The precursor fibers were fabricated by dry spinning, followed by pyrolysis at 800 ℃, 1000 ℃, and 1200 ℃ to yield continuous SiOC, SiAlOC, and SiZrOC ceramic fibers. The microstructure, surface morphologies, compositions, mechanical properties, and thermal stability of the continuous SiOC and SiMOC ceramic fibers were thoroughly examined by relevant characterization tools. The results showed that the continuous SiMOC fibers exhibited smooth surfaces and dense structures with effective formation of Si-O-M bonds. The measured tensile strength of fabricated continuous SiAlOC and SiZrOC ceramic fibers revealed optimum values of 139.8 MPa and 162.4 MPa, respectively, much higher than the continuous SiOC ceramic fibers (124 MPa). The continuous SiMOC fibers demonstrated remarkable resistance to high-temperature ablation and oxidation, maintaining structural integrity after exposure to a butane flame for 60 seconds and heat treatment in air at 1300 ℃ for 1 h. Additionally, the continuous SiZrOC fibers displayed excellent infrared reflectance of 10.28%, suggesting their potential as superior thermal insulation material in high-temperature applications.

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Fabrication of continuous SiOC ceramic fibers by polyethylene oxide assisted sol-gel method

Cited by 4 publications

References 49 publications

High-temperature resistance and thermal insulation performance of continuous SiMOC ceramic fibers fabricated by the modified sol-gel method combined with dry spinning

High-temperature resistance and thermal insulation performance of continuous SiMOC ceramic fibers fabricated by the modified sol-gel method combined with dry spinning

Boron nitride nanosheets composite SiC fibers with enhanced mechanical properties and high‐temperature resistance

High-temperature resistance and thermal insulation performance of continuous SiMOC ceramic fibers fabricated by the modified sol-gel method combined with dry spinning

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