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Published June 2020 | public
Journal Article

Permeable carbon nanotube-reinforced silicon oxycarbide via freeze casting with enhanced mechanical stability

Abstract

Reinforcement strategies were applied to solution-based freeze-casting systems to form porous ceramic composites. Multi-walled carbon nanotubes (MWCNT) were used as the reinforcing fillers in a polysiloxane preceramic polymer freeze cast with dimethyl carbonate to produce silicon oxycarbide-based lamellar pore structures. Using a carefully designed dispersion procedure, CNT agglomerates were reduced both in suspension and in pore walls. Electrical conductivity increased by ten orders of magnitude over pure silicon oxycarbide, indicating the preservation of CNTs after pyrolysis. Permeability, compression, and diametral compression (Brazilian disk) tests were performed to demonstrate the reinforcing effect of CNTs without sacrificing the permeability of the final porous structures.

Additional Information

© 2019 Elsevier Ltd. Received 8 September 2019, Revised 10 December 2019, Accepted 28 December 2019, Available online 20 January 2020.

Additional details

Created:
August 22, 2023
Modified:
October 19, 2023