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Super-flexible silica based aerogels with additive reinforcement for aeronautics’ insulation application

Voepel, Pascal and Rege, Ameya and Hillgärtner, Markus and Itskov, Mikhail and Milow, Barbara (2019) Super-flexible silica based aerogels with additive reinforcement for aeronautics’ insulation application. 6th International Conference on Multifunctional, Hybrid and Nanomaterials, 11.-15. März 2019, Sitges, Spanien.

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Abstract

We have developed a reinforced aerogel hybrid material which is super-flexible, light weight and hydrophobic. Also, the thermal insulation of approx. 30 mW K-1m-1 already surpasses aviation guidelines by 25 %. The aerogel is made of silica derivatives based on functionalized silane precursors and a pH value-induced gelation process. The water-repellant surface of the aerogel inhibits water infusion and guarantees constant insulating properties. Acoustic absorbance of the compound is shifted significantly towards the 500 Hz region compared to commercially available porous absorbers. Fleece-reinforced flexible silica aerogels were tested under uniaxial quasistatic compression in a thermal chamber at three different temperatures, -50, 0, and 50°C. While a change in the temperature environment, from 50°C to 0°C, shows a negligible influence on their mechanical response, they exhibit a pronounced stiffness (2-4 times) at -50°C. Furthermore, inelastic effects such as cyclic stress softening, Mullins effect, and residual deformation are also investigated. Combining these properties a multifunctional material with improved thermal properties for aeronautic application was designed which potentially contributes to a comfort increase in aviation. A full characterization of the materials is carried out and theoretical models are developed to understand the impact of the aerogel structure on the compound properties and - vice versa - calculate potentially beneficial aerogel structures and realize them synthetically.

Item URL in elib:https://elib.dlr.de/126912/
Document Type:Conference or Workshop Item (Poster)
Title:Super-flexible silica based aerogels with additive reinforcement for aeronautics’ insulation application
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Voepel, Pascalpascal.voepel (at) dlr.dehttps://orcid.org/0000-0001-8233-7261
Rege, Ameyaameya.rege (at) dlr.dehttps://orcid.org/0000-0001-9564-5482
Hillgärtner, MarkusRWTH AachenUNSPECIFIED
Itskov, MikhailRWTH AachenUNSPECIFIED
Milow, BarbaraBarbara.Milow (at) dlr.dehttps://orcid.org/0000-0002-6350-7728
Date:14 March 2019
Refereed publication:Yes
Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Flugzeugkabine, Isolation, Aerogel, Faserverstärkt, Komposit, Verbundwerkstoff, flexibel
Event Title:6th International Conference on Multifunctional, Hybrid and Nanomaterials
Event Location:Sitges, Spanien
Event Type:international Conference
Event Dates:11.-15. März 2019
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Systems and Cabin, L - Structures and Materials
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogele
Deposited By: Vöpel, Pascal
Deposited On:11 Apr 2019 10:28
Last Modified:11 Apr 2019 10:28

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