Li, Guo-QingYu, MinLuo, HangHuang, Ze-YaFu, Ren-LiGucci, FrancescoSaunders, TheoZhu, Kong-JunZhang, Dou2023-01-042023-01-042023-02-10Li GQ, Yu M, Luo H, et al., (2023) Low-temperature thermally modified fir-derived biomorphic C–SiC composites prepared by sol-gel infiltration. Ceramics International, Volume 49, Issue 6, March 2023, pp. 9523-95330272-8842https://doi.org/10.1016/j.ceramint.2022.11.119https://dspace.lib.cranfield.ac.uk/handle/1826/18836In order to solve the problems (i.e. low infiltration efficiency, cracks, interface separation and poor mechanical properties) in the process of wood-derived C–SiC composites, the thermal modification of fir at low temperatures (300 °C ∼ 350 °C) combined with sol-gel infiltration was used to successfully produce biomorphic ceramics. The prepared materials were comprehensively characterized and exhibited improved interfacial bonding between C and SiC and mechanical properties. The weight gain per unit volume (0.123 g/cm3) of SiO2 gel in the fir thermally modified at 300 °C is 167.4%, higher than that (0.046 g/cm3) of the unmodified fir. A well-bonded interface was formed between the SiO2 gel and the pore wall of the fir thermally modified at 300 °C. With the increase of modification temperature from 300 °C to 350 °C, the distance between SiO2 gel and the pore wall increases, and a gap (1–3 μm) is observed between SiO2 gel and the pore wall of the fir carbonized at 600 °C. The C–SiC composites sintered at 1400 °C exhibited the highest compressive strength and bending strength of 40.8 ± 5.8 MPa and 11.7 ± 2.1 MPa, respectively, owing to the well-bonded interface between C of fir thermally modified at 300 °C and SiC. However, the composites sintered at 1600 °C for 120 min exhibited the lowest compressive strength and bending strength of 28.1 ± 13.4 MPa and 5.7 ± 1.6 MPa, respectively, which are 31.1% and 51.3% lower than those sintered at 1400 °C for 120 min, respectively. This might result from the porous structure formed by the excessive consumption of fir-derived carbon during the reaction between C and SiO2 at 1600 °C for 120 min. Therefore, thermal modification in the preparation of biomorphic C–SiC composites can promote slurry infiltration and the formation of a well-bonded interface between C and SiC, thus improving the mechanical properties of the composites.enAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Thermally modified firSol-gelCompositesCompressive strengthBending strengthArticle