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Aerogels for Foundry Applications

Ratke, Lorenz and Milow, Barbara (2011) Aerogels for Foundry Applications. In: Aerogels Handbook Advances in Sol-Gel Derived Materials and Technologies. Springer Verlag. pp. 763-790. ISBN 978-1-4419-7477-8.

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Abstract

The casting of metals and alloys is very often performed into molds made of sands bonded by polymers. Resins based on, for instance, phenol–formaldehyde build bonding bridges between the sand grains, establishing a macroporous tight and strong sand form having a shape mirroring the workpiece to be cast. Any cavity in a casting is mapped by so-called cores, which are also made of polymeric-bonded sands. Organic aerogels can replace conventional polymers and offer a variety of advantages due to their nanostructure and composition, especially for cores. The development of these organic aerogels for lightmetal and nonferrous heavy metal casting is described, their properties elaborated and compared with conventional ones. Transforming especially resorcinol–formaldehyde aerogels into carbon aerogels allows bonding sand grains by amorphous, nanostructured carbon with special advantages. New developments in the last few years are described, revealing that inorganic and organic aerogels in a granular form can replace a part of any sand used in foundries, leading to improved cast parts. In contrast to polymeric aerogels, silica-based ones have been used for more than a decade in solidification engineering to study fundamental aspects of metal solidification and casting. The final section describes various applications of inorganic aerogels with respect to solidification science.

Document Type:Contribution to a Collection
Title:Aerogels for Foundry Applications
Authors:
AuthorsInstitution or Email of Authors
Ratke, LorenzUNSPECIFIED
Milow, BarbaraUNSPECIFIED
Date:July 2011
Journal or Publication Title:Aerogels Handbook
Page Range:pp. 763-790
Editors:
EditorsEmail
Aegerter, Michel A.micehl.aegerter@bluewin.ch
Leventis, Nicholasleventis@mst.edu
Koebel, Matthias M.matthias.koebel@empa.ch
Publisher:Springer Verlag
Series Name:Advances in Sol-Gel Derived Materials and Technologies
ISBN:978-1-4419-7477-8
Status:Published
Keywords:aerogels, sand casting, foundry, binder, polymeric aerogels, carbon aerogels, silica
HGF - Research field:other
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:no assignement
DLR - Program:no assignment
DLR - Research theme (Project):other
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Prof. Lorenz Ratke
Deposited On:16 Aug 2011 08:22
Last Modified:16 Aug 2011 08:22

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