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Enrico Bernardo, Giulio Parcianello, Paolo Colombo and Siobhan Matthews Wollastonite Foams From an Extruded Preceramic Polymer Mixed with CaCO3 Microparticles Assisted by Supercritical Carbon Dioxide Advanced Engineering Materials 15

Version of Record online: 19 SEP 2012 | DOI: 10.1002/adem.201200202

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CO2-assisted extrusion provides a homogeneous mixing between a silicone resin and CaCO3 microsized filler. Direct ceramization of extrudates, although effective in yielding phase pure wollastonite and a well distributed microporosity, cannot be considered a final shaping technique, due to the formation of macrodefects. Silicone/CaCO3 extrudates may be used, after grinding, as raw materials for the fabrication of wollastonite foams, with or without addition of sacrifical PMMA templates. In this case, a low temperature thermal treatment (300 °C) optimizes the release of carbon dioxide, with development of interconnected macropores, along with micropores, maintained after ceramization at 900 °C.

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