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On the fraction of sand grains bounded in molding materials – a new measurement technique
Reuss, Michael and Ratke, Lorenz (2010) On the fraction of sand grains bounded in molding materials – a new measurement technique. Giessereiforschung - International Foundry Research, 62 (1), pp. 24-29. ISSN 0046-5933.
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Official URL: http://www.international-foundry-research.com
Abstract
We present a method that allows to determine the fraction of unbounded sand grains in a compacted sand-binder system as used in foundry practice. The method uses a dynamic gas permeability measurement technique, which reveals that in foundry sands the permeability is not a constant but depends on the pressure difference driving the flow through it. This effect can be understood on the basis of so-called rattlers, being unbounded sand grains. A model of the effect is developed and evaluated with respect to the volume fraction of unbounded sand grains. The amount of unbounded grains is typically between 1 and 10 volume percent.
| Document Type: | Article | ||||||
|---|---|---|---|---|---|---|---|
| Title: | On the fraction of sand grains bounded in molding materials – a new measurement technique | ||||||
| Authors: |
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| Date: | 15 March 2010 | ||||||
| Journal or Publication Title: | Giessereiforschung - International Foundry Research | ||||||
| Refereed publication: | Yes | ||||||
| In SCOPUS: | No | ||||||
| In ISI Web of Science: | No | ||||||
| Volume: | 62 | ||||||
| Page Range: | pp. 24-29 | ||||||
| ISSN: | 0046-5933 | ||||||
| Status: | Published | ||||||
| Keywords: | Gas permeability, molding sand, unbounded sand grains, rattlers | ||||||
| HGF - Research field: | Aeronautics, Space and Transport | ||||||
| HGF - Program: | Space | ||||||
| HGF - Program Themes: | W FR - Forschung unter Weltraumbedingungen | ||||||
| DLR - Research area: | Space | ||||||
| DLR - Program: | W FR - Forschung unter Weltraumbedingungen | ||||||
| DLR - Research theme (Project): | W - Vorhaben Materialwissenschaftliche Forschung | ||||||
| Location: | Köln-Porz | ||||||
| Institutes and Institutions: | Institute of Materials Physics in Space | ||||||
| Deposited By: | Prof. Lorenz Ratke | ||||||
| Deposited On: | 24 Mar 2010 11:52 | ||||||
| Last Modified: | 04 Apr 2013 16:21 |
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