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Novel SiC/C Aerogels Through Pyrolysis of Polycarbosilane Precursors

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/
Document Type:Article
Additional Information:Referierte Publikation
Title:Novel SiC/C Aerogels Through Pyrolysis of Polycarbosilane Precursors
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Zera, EmanueleUNSPECIFIEDUNSPECIFIED
Campostrini, RenzoUNSPECIFIEDUNSPECIFIED
Parakkulam Ramaswamy, AravindWFUNSPECIFIED
Blum, YigalUNSPECIFIEDUNSPECIFIED
Soraru, Gian DomenicoUNSPECIFIEDUNSPECIFIED
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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