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Preparation of high temperature stable SiOC aerogels for foundry applications

Meyer, Eva and Milow, Barbara and Ratke, Lorenz (2015) Preparation of high temperature stable SiOC aerogels for foundry applications. 39th International Conference and Expo on Advanced Ceramics and Composites, 25.-30.Jan. 2015, Daytona Beach, USA.

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Abstract

Silica Aerogels are highly porous nanostructured materials with an open three-dimensional silica network. Their low density, high surface area and low thermal conductivity are interesting for several industrial applications. Casting of metals and alloys simply means the pouring of a liquid metal into a form which most often is made from resin bonded quartz sand. Replacing a fraction of sand by aerogels can improve the casting quality, since the contact of the hot melt leads to a huge gas evolution and induces many casting defects. The huge internal surface of aerogels helps to absorb this decomposition gases and thus improves casting quality. Unfortunately the thermal load on the aerogels can lead to a rapid sintering and shrinkage and then induce other casting defects. We therefore developed a new thermally stable Si-O-C aerogel. These are synthesized using a mixture of MTMS and TEOS as precursor materials in a conventional two-step acid-base sol-gel routine. After ambient drying of the aerogels these are transformed into to Si-O-C aerogels by pyrolysis at 1000 °C. A systematic variation of the TEOS: MTMS ratio allows to vary the Oxygen and Carbon content. The aerogels are characterized by envelope and skeletal density, nitrogen adsorption (BET, BJH) and SEM. Tests in foundries are on the way.

Item URL in elib:https://elib.dlr.de/98626/
Document Type:Conference or Workshop Item (Poster)
Title:Preparation of high temperature stable SiOC aerogels for foundry applications
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Meyer, Evaeva.meyer (at) dlr.deUNSPECIFIED
Milow, BarbaraBarbara.Milow (at) dlr.deUNSPECIFIED
Ratke, Lorenzlorenz.ratke (at) dlr.deUNSPECIFIED
Date:January 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:SiOC-aerogels, Foundry application, additives
Event Title:39th International Conference and Expo on Advanced Ceramics and Composites
Event Location:Daytona Beach, USA
Event Type:international Conference
Event Dates:25.-30.Jan. 2015
Organizer:The American Ceramic Society
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 10:11
Last Modified:10 May 2016 23:32

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