Zera, Emanuele and Campostrini, Renzo and Parakkulam Ramaswamy, Aravind and Blum, Yigal and Soraru, Gian Domenico (2014) Novel SiC/C Aerogels Through Pyrolysis of Polycarbosilane Precursors. Advanced Engineering Materials. Wiley. doi: 10.1002/adem.201400134. ISSN 1438-1656.
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Abstract
A new approach for forming aerogels with various silicon-based compositions and hybrids between ceramics and carbon has been developed by combining efficient hydrosilylation as the hybridization-crosslinking approach associated with gelation in the presence of solvent and followed by supercritical drying techniques. Highly porous carbon-enriched SiC/C aerogels with adequate mechanical durability have been synthesized, pyrolyzed, and characterized. The “wet” gels were obtained by crosslinking a commercial polycarbosilane with divinylbenzene via Pt-catalyzed hydrosilylation reaction in highly diluted condition (90 vol% of solvent). A supercritical drying was performed after exchanging the solvent (cyclohexane) with liquid CO2 forming undamaged aerogels. A subsequent pyrolysis and heat treatment (up to 1500 °C) in argon flow converted the polymeric aerogel into a SiC/C-based material with bulk density of 166 kg m−3, SSA of 444 m2 g−1, a micro-meso pore volume of 0.79 cm3 g−1, total porosity above 90 vol% and ultimate compressive strength of 1.6 MPa. The final product was compared to its cured gel and intermediates obtained during the pyrolysis process.
Item URL in elib: | https://elib.dlr.de/93501/ | ||||||||||||||||||
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Document Type: | Article | ||||||||||||||||||
Additional Information: | Referierte Publikation | ||||||||||||||||||
Title: | Novel SiC/C Aerogels Through Pyrolysis of Polycarbosilane Precursors | ||||||||||||||||||
Authors: |
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Date: | 28 April 2014 | ||||||||||||||||||
Journal or Publication Title: | Advanced Engineering Materials | ||||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||||
Open Access: | No | ||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||
In SCOPUS: | Yes | ||||||||||||||||||
In ISI Web of Science: | Yes | ||||||||||||||||||
DOI: | 10.1002/adem.201400134 | ||||||||||||||||||
Publisher: | Wiley | ||||||||||||||||||
ISSN: | 1438-1656 | ||||||||||||||||||
Status: | Published | ||||||||||||||||||
Keywords: | SiC, Aerogel, Pyrolyse, Nanostruktur, BET | ||||||||||||||||||
HGF - Research field: | Aeronautics, Space and Transport | ||||||||||||||||||
HGF - Program: | Transport | ||||||||||||||||||
HGF - Program Themes: | Terrestrial Vehicles (old) | ||||||||||||||||||
DLR - Research area: | Transport | ||||||||||||||||||
DLR - Program: | V BF - Bodengebundene Fahrzeuge | ||||||||||||||||||
DLR - Research theme (Project): | V - Neuartige Fahrzeugkonzepte und -strukturen (old) | ||||||||||||||||||
Location: | Köln-Porz | ||||||||||||||||||
Institutes and Institutions: | Institute of Materials Research > Aerogele | ||||||||||||||||||
Deposited By: | Milow, Dr. Barbara | ||||||||||||||||||
Deposited On: | 16 Dec 2014 08:53 | ||||||||||||||||||
Last Modified: | 10 Jan 2019 15:45 |
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