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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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.
|Title:||On the fraction of sand grains bounded in molding materials – a new measurement technique|
|Date:||15 March 2010|
|Journal or Publication Title:||Giessereiforschung - International Foundry Research|
|In ISI Web of Science:||No|
|Page Range:||pp. 24-29|
|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|
|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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