Continuous direct melt foaming of a preceramic polymer using carbon dioxide: extrusion device and first results
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In comparison to bulk materials, foams offer advantageous properties like low density, large surface area, high permeability, and low thermal conductivity. Therefore, foams are widely used in, e.g. thermal insulation, lightweight constructions, filtering, and catalysis. Prominent features of ceramic foams are high strength and stiffness, high temperature resistance, and high thermal shock resistance . However, the foam properties depend strongly on the foam morphology and porosity which are influenced by the processing technique. The most important production routes incorporating preceramic polymers are the replica method, the template method, and direct foaming. The replica method uses an open cell polymer foam which is coated by a preceramic polymer slurry and subsequently pyrolysed leading to a positive foam structure [2, 3, 4, 5, 6]. The template method is based on organic phases such as polymer microbeads or expendable microspheres mixed into a preceramic polymer...
KeywordsFoam Average Pore Size Template Method Foam Structure Ceramic Foam
The authors gratefully acknowledge the funding of the German Research Foundation (DFG), which, within the framework of its “Excellence Initiative” supports the Cluster of Excellence “Engineering of Advanced Materials” (https://doi.org/www.eam.uni-erlangen.de) at the University Erlangen-Nuremberg. Special thanks go to Dr. Larissa Zirkel and Dr. Joachim Kaschta for their helpful discussions and suggestions during the set up of the foam extrusion line. The support of the Institute of Glass and Ceramics of the University Erlangen-Nürnberg at which the pyrolysis of the sample shown was performed, is highly acknowledged.
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