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Development of aerogel additives for the foundry industry

Meyer, Eva and Milow, Barbara and Ratke, Lorenz (2015) Development of aerogel additives for the foundry industry. The Journal of Supercritical Fluids (106C), pp. 62-68. Elsevier. doi: 10.1016/j.supflu.2015.06.018. ISSN 0896-8446.

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The quality of cast products can be improved by using high-temperature stable aerogels or xerogels within sand cores that are able to adsorb gases deriving from thermal decomposition of resins used as sand grain binders. We developed pure TEOS (tetraethoxysilane) and pure MTMS (methyltrimethoxysilane) aerogels as well as mixed MTMS/TEOS aerogels to yield high-temperature stable aerogels by pyrolysis that are considered capable to improve the casting process of copper-based alloys. Aerogel samples were synthesized from pure TEOS or MTMS precursors or from different MTMS/TEOS ratios by using NH4Faq as catalyst. Wet gels were dried under ambient pressure and were pyrolyzed to yield SiOC aerogels. After pyrolysis the samples were characterized by density, nitrogen adsorption (BET, BJH), scanning electron microscopy and thermogravimetric analysis. Examinations on sand core behavior and cast surface quality were performed by adding the most promising material in granular form as an additive (inner surface area: 890 m2/g) in different volume percentage to the sand grain mixture. For this application we synthesised liters of aerogels.

Item URL in elib:https://elib.dlr.de/98618/
Document Type:Article
Title:Development of aerogel additives for the foundry industry
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Milow, BarbaraUNSPECIFIEDhttps://orcid.org/0000-0002-6350-7728UNSPECIFIED
Date:25 June 2015
Journal or Publication Title:The Journal of Supercritical Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 62-68
EditorsEmailEditor's ORCID iDORCID Put Code
Kiran, ErdoganVirginia Polytechnic Institute & State UniversityUNSPECIFIEDUNSPECIFIED
Brunner, GerdTechnische Universität Hamburg-Harburg (TUHH)UNSPECIFIEDUNSPECIFIED
Smirnova, IrinaTechnische Universität Hamburg-Harburg (TUHH)UNSPECIFIEDUNSPECIFIED
Series Name:Special Issue of Aerogels
Keywords:- High‑temperature stable aerogels as foundry additives in sand cores. - High inner surface area for Methyltrimethoyxsilane‑tetraethoxysilane aerogels. - First results of sand core and cast analysis.
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 - NGC Fahrzeugstruktur (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogele
Deposited By: Meyer, Eva Helen
Deposited On:26 Oct 2015 10:13
Last Modified:06 Nov 2023 09:26

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