Ceramic foams from preceramic polymers |
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Authors: | Paolo Colombo John R Hellmann |
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Affiliation: | (1) Dipartimento di Chimica Applicata e Scienza dei Materiali, Università di Bologna, Viale Risorgimento, 2, 40136 Bologna, Italy,;(2) Department of Material Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA, |
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Abstract: | The direct foaming of preceramic polymer mixtures, followed by high temperature pyrolysis in an inert atmosphere, can be employed
to fabricate ceramic foams with impressive strength, stiffness, thermomechanical and thermochemical durability, and electromagnetic
properties. Flexural strength and stiffness were superior to those of foams produced using conventional replication process
technologies. Excellent strength retention and thermal fatigue resistance was exhibited during long term static and cyclic
thermal exposure to 1200 °C in air. Further improvements can be realized through judicious selection of the preceramic polymers
and pre-pyrolysis process modifications. Fabrication of foams with graded porosity and multifunctionality, via the incorporation
of electrically-, thermally-, and magnetically-active fillers was demonstrated. This direct foaming technology offers substantial
opportunity for the near-net shape fabrication of lightweight, inorganic foam structures with tailored thermal, elastic, mechanical,
electrical and magnetic characteristics for high temperature applications.
Electronic Publication |
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Keywords: | Ceramic foam Porous ceramic Preceramic polymer Oxycarbide Silicone |
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