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Characterisation of Carbon-AeroSands

Reuß, Michael and Ratke, Lorenz (2009) Characterisation of Carbon-AeroSands. Giessereiforschung - International Foundry Research, 61 (1), pp. 24-33. ISSN 0046-5933.

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Official URL: http://www.international-foundry-research.com

Abstract

Organic aerogels used as a binding material for sand cores and moulds lead to the so-called AeroSands. The bonding bridges consist of a nanostructured open porous aerogel instead of a conventional polymer. Instead of using polymeric aerogels as a binder one can also use carbon aerogels. Carbon aerogels are obtained from pyrolysis of polymeric aerogels, i.e. after heat treatment under vacuum at temperatures of 1000°C. We optimized the manufacturing process and the quality of the polymeric and carbon aerosands. We varied the kind of sand, using Quartz, Alodur, MinelcoOlivine, Zirconia sand and Cerabeads from Hüttenes-Albertus, the amount of liquid binder from 2.5 to 20 wt% and the drying and annealing heat treatment of the polymeric AeroSand (temperatures 250°C to 1000°C). We measured the bending strength and tracked the pyrolysis process by x-ray diffraction, thermogravimetry and scanning electron microscopy. The bending strength of AeroSands exhibits a maximum after a heat treatment of 250°C. The strength depends on the inverse square root of the average sand grain size.

Document Type:Article
Title:Characterisation of Carbon-AeroSands
Authors:
AuthorsInstitution or Email of Authors
Reuß, MichaelUNSPECIFIED
Ratke, LorenzUNSPECIFIED
Date:February 2009
Journal or Publication Title:Giessereiforschung - International Foundry Research
Refereed publication:Yes
In SCOPUS:No
In ISI Web of Science:No
Volume:61
Page Range:pp. 24-33
ISSN:0046-5933
Status:Published
Keywords:Sol-gel process, aerogel, binder
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Prof. Lorenz Ratke
Deposited On:31 Mar 2009
Last Modified:07 Feb 2013 19:42

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