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Opacified Fiber Reinforced Silica Aerogels for Three Dimensional Parts

Heyer, Markus and Berkefeld, Andre and Voepel, Pascal and Milow, Barbara (2020) Opacified Fiber Reinforced Silica Aerogels for Three Dimensional Parts. Online Aerogel Seminar 2020, 16-18.Sep2020, Online (Hamburg).

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Abstract

Within this study, monolithic three-dimensional silica aerogel (SA) composite with super insulating properties are discussed. A generic part based on fiber-reinforced (FR) silica aerogel for thermal insulation of the exhaust tubing system was produced via a sol-gel-based molding process in combination with a supercritical drying using scCO2 to improve the efficiency of the catalyst system by keeping the exhaust gases as hot as possible. A thermal conductivity of 16 mW / m * K and less was measured via heat flow meter technique. In this work, we present a full cycle of the material compound design, starting with a fundamental material evaluation including aerogel optimization, opacifier influence, and the sol-casting process. The obtained generic part in shape of a half-shell for exhaust tubing insulation system is characterized under real conditions in relation to a commercially available product. The developed material is based on pristine silica aerogel which has already been used for honeycomb structures.[1] However the aerogel’s synthesis again had to be optimized for the proposed purpose as the material’s homogeneity becomes highly important for the present application. The new designed aerogel composite was tested up to temperatures of more than 800 °C and exhibits surface temperatures of approx. 70 °C less than the commonly used material. Also, overshooting of temperatures cannot be seen through the material and therefore the new composite does not only protect the outside from absolute high temperatures but also from fast temperature changes and short term peak temperatures on the inside.[2] 1. Berkefeld, A., M. Heyer, and B. Milow, Silica aerogel paper honeycomb composites for thermal insulations. Journal of Sol-Gel Science and Technology, 2017. 84(3): p. 486-495. 2. Heyer, M., et al., Advanced Opacified Fiber-Reinforced Silica-Based Aerogel Composites for Superinsulation of Exhaust Tubing Systems in Semi-Stationary Motors. Materials, 2020. 13(12): p. 2677.

Item URL in elib:https://elib.dlr.de/136145/
Document Type:Conference or Workshop Item (Poster)
Title:Opacified Fiber Reinforced Silica Aerogels for Three Dimensional Parts
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Heyer, Markusmarkus.heyer (at) dlr.dehttps://orcid.org/0000-0002-5180-0695
Berkefeld, AndreAndre.Berkefeld (at) dlr.deUNSPECIFIED
Voepel, Pascalpascal.voepel (at) dlr.dehttps://orcid.org/0000-0001-8233-7261
Milow, BarbaraBarbara.Milow (at) dlr.dehttps://orcid.org/0000-0002-6350-7728
Date:17 September 2020
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:silica aerogel; fiber reinforcement; opacifiers; super insulation; boehmite particles; high temperature; generic part; manufacturing
Event Title:Online Aerogel Seminar 2020
Event Location:Online (Hamburg)
Event Type:international Conference
Event Dates:16-18.Sep2020
Organizer:TUUH, Hamburg Univeristy of Technology
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Road Transport
DLR - Research area:Transport
DLR - Program:V ST Straßenverkehr
DLR - Research theme (Project):V - NGC Fahrzeugstruktur II
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogels and Aerogel Composites
Deposited By: Heyer, Markus
Deposited On:19 Oct 2020 09:55
Last Modified:19 Oct 2020 09:55

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