Abstract
Zirconium carbide–silicon carbide (ZrC–SiC) ceramics are amongst the promising candidate materials for thermal protection structures in hypersonic re-entry space vehicles. A thermoset hybrid sol for the syntheses of monolithic ZrC–SiC composites was prepared by a simple sol–gel method. Furfuryl alcohol, polyzirconoxane and tetraethyl orthosilicate were used as raw materials. The as-synthesized sol can be cured at 85 °C for 24 h to obtain a bulk gel. The cured gel is converted into porous ZrC–SiC monolith with porosity of 44.1% after pyrolysis at 1500 °C for 1 h in vacuum. The ZrC–SiC monolith is composed of well distributed nano-sized ZrC and SiC particles. Highly porous ZrC–SiC ceramic foam with density of 0.34 g/cm3 and porosity of 78.1% is prepared by replica method using the hybrid sol as precursor and melamine foam as templates. The hybrid sol and ZrC–SiC composites are characterized by FT-IR, TG–DTA, XRD, SEM, EDS and TEM.
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Financial support from the National Natural Science Foundation of China (No. 51602324, 51532009) and the Fundamental Research Funds for the Central Universities (No. 2232018D3-32) are gratefully acknowledged.
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FL and XH conceived the concept of the study and prepared the manuscript. FL and D-WN carried out samples preparation. FL and WB conducted microstructural characterization. All authors contributed with discussion of results and manuscript revision.
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Li, F., Bao, W., Ni, DW. et al. A thermoset hybrid sol for the syntheses of zirconium carbide–silicon carbide foam via replica method. J Porous Mater 26, 409–417 (2019). https://doi.org/10.1007/s10934-018-0618-z
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DOI: https://doi.org/10.1007/s10934-018-0618-z