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
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 1000Â°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 HÃ¼ttenes-Albertus, the amount of liquid binder from 2.5 to 20 wt% and the drying and annealing heat treatment of the polymeric AeroSand (temperatures 250Â°C to 1000Â°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 250Â°C. The strength depends on the inverse square root of the average sand grain size.
|Title:||Characterisation of Carbon-AeroSands|
|Journal or Publication Title:||Giessereiforschung - International Foundry Research|
|In ISI Web of Science:||No|
|Page Range:||pp. 24-33|
|Keywords:||Sol-gel process, aerogel, binder|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W - no assignement|
|DLR - Research area:||Space|
|DLR - Program:||W - no assignement|
|DLR - Research theme (Project):||W -- no assignement (old)|
|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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