Out-of-furnace oxidation of SiCN polymer-derived ceramic aerogel pyrolized at intermediate temperature (600-800°C)

Zera E, Nickel W, Kaskel S, Soraru GD (2016)

Publication Type: Journal article

Publication year: 2016

Journal

Journal of the European Ceramic Society Elsevier

Book Volume: 36

Pages Range: 423-428

Journal Issue: 3

DOI: 10.1016/j.jeurceramsoc.2015.10.038

Abstract

The polymer-to-ceramic transformation of a polysilazane/divinylbenzene aerogel leading to SiCN aerogel was studied. The pre-ceramic samples were obtained by crosslinking a commercially available polysilazane with divinylbenzene in a highly diluted solution. Wet gels were supercritically dried using CO2 to get the pre-ceramic aerogel. The weight change during pyrolysis in flowing argon was studied by thermogravimetric analysis (in-situ measurements) and by measuring the weight change on samples pyrolyzed in a tubular furnace after cooling down to room temperature (ex-situ measurements). The structural transformation was followed by infrared spectroscopy while the microstructural changes were studied by nitrogen adsorption analysis. Results point out that samples pyrolyzed at intermediate temperature, i.e., around 600-800°C, react with the laboratory atmosphere forming SiO bonds and SiOH moieties. This out-of-furnace oxidation leads to an uncontrolled increase of the oxygen content of the pyrolyzed ceramics and eventually reduces the microporosity of the samples and its stability.

Involved external institutions

Università degli Studi di Trento

Italy (IT) Technische Universität Dresden

Germany (DE)

How to cite

APA:

Zera, E., Nickel, W., Kaskel, S., & Soraru, G.D. (2016). Out-of-furnace oxidation of SiCN polymer-derived ceramic aerogel pyrolized at intermediate temperature (600-800°C). Journal of the European Ceramic Society, 36(3), 423-428. https://doi.org/10.1016/j.jeurceramsoc.2015.10.038

MLA:

Zera, E., et al. "Out-of-furnace oxidation of SiCN polymer-derived ceramic aerogel pyrolized at intermediate temperature (600-800°C)." Journal of the European Ceramic Society 36.3 (2016): 423-428.

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