Journal
ADVANCES IN APPLIED CERAMICS
Volume 117, Issue 8, Pages 468-475Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/17436753.2018.1495897
Keywords
Carbon aerogel; supercritical drying; thermal properties; toughness
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Funding
- Fundamental Research Fund for the Central Universities [2018YJS099]
- National Natural Science Foundation of China [11227801, 11472038]
- Research Innovation Fund of Shenzhen City of China [JCYJ20170413104256729, JCYJ20170811160538023]
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Carbon aerogels are prepared via the sol-gel polymerisation of resorcinol with formaldehyde, followed by supercritical drying and carbonisation. The fabricated carbon aerogels have low densities in the range 0.028-0.196 g cm(-3), ultra-low thermal conductivities in the range 0.0259-0.0707 W (mK)(-1) and high specific surface areas (>520 m(2) g(-1)). The carbon aerogel composites are reinforced with short carbon fibres by adding the carbon fibres to the resorcinol-formaldehyde solution to reduce their brittle nature and improve their machinability. The compressive strength of the composites containing 2 wt-% carbon fibres is 1.75MPa, which is 56% higher than that of pure carbon aerogel. Both fracture toughness and compressive strength of these composites are improved. These composites also have good machinability, with the ability to maintain their shape after being machined with traditional steel tools. Furthermore, the composites with nanoporous structure exhibit ultra-low thermal conductivity up to 1400 degrees C.
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