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Processing and thermal characterization of polymer derived SiCN(O) and SiOC reticulated foams

Santhosh, Balanand and Ahmetoglu, Cekdar Vakif and Ionescu, Emanuel and Reitz, Andreas and Albert, Barbara and Sorarù, Gian Domenico (2020):
Processing and thermal characterization of polymer derived SiCN(O) and SiOC reticulated foams.
In: Ceramics international, (5), 46. Elsevier, pp. 5594-5601, ISSN 0272-8842, e-ISSN 1873-3956,
DOI: 10.1016/j.ceramint.2019.11.003,
[Online-Edition: https://www.sciencedirect.com/science/article/pii/S027288421...],
[Article]

Abstract

Highly porous polymer-derived SiCN(O) and SiOC ceramics with low thermal conductivity were developed by replicating polyurethane (PU) foams. The PU templates were impregnated with polysilazane or polysiloxane precursor, followed by pyrolysis at different temperatures (1200 degrees C - 1500 degrees C) yielding SiCN(O) or SiOC ceramic foams, respectively. The swelling and cross-linking behavior of the used precursors had a significant impact on the morphology of the prepared foams. The samples had bulk densities ranging from 0.03 g.cm(-3) to 0.56 g.cm(-3) and a total porosity in the range from 75 to 98 vol%. Fourier transform infrared (FT-IR), Raman spectroscopy, X-ray diffraction (XRD) were employed to follow the structural evolution together with morphological characterization by scanning electron microscopy (SEM). The obtained ceramics were thermally stable up to 1400 degrees C, and the linear thermal expansion coefficient values of the porous SiCN(O) and SiOC components in the temperature range from 30 to 850 degrees C were found to be similar to 1.72 x 10(-6) .K-1 and similar to 1.93 x 10(-6) .K-1, respectively. Thermal conductivity (lambda) as low as 0.03 W.m(-1) K-1 was measured for the SiCN(O) and SiOC foams at room temperature (RT). The lambda of the ceramic struts were also assessed by using the Gibson-Ashby model and estimated to be 2.1 W.m(-1) K-1 for SiCN(O), and 1.8 W.m(-1) K-1 for SiOC.

Item Type: Article
Erschienen: 2020
Creators: Santhosh, Balanand and Ahmetoglu, Cekdar Vakif and Ionescu, Emanuel and Reitz, Andreas and Albert, Barbara and Sorarù, Gian Domenico
Title: Processing and thermal characterization of polymer derived SiCN(O) and SiOC reticulated foams
Language: English
Abstract:

Highly porous polymer-derived SiCN(O) and SiOC ceramics with low thermal conductivity were developed by replicating polyurethane (PU) foams. The PU templates were impregnated with polysilazane or polysiloxane precursor, followed by pyrolysis at different temperatures (1200 degrees C - 1500 degrees C) yielding SiCN(O) or SiOC ceramic foams, respectively. The swelling and cross-linking behavior of the used precursors had a significant impact on the morphology of the prepared foams. The samples had bulk densities ranging from 0.03 g.cm(-3) to 0.56 g.cm(-3) and a total porosity in the range from 75 to 98 vol%. Fourier transform infrared (FT-IR), Raman spectroscopy, X-ray diffraction (XRD) were employed to follow the structural evolution together with morphological characterization by scanning electron microscopy (SEM). The obtained ceramics were thermally stable up to 1400 degrees C, and the linear thermal expansion coefficient values of the porous SiCN(O) and SiOC components in the temperature range from 30 to 850 degrees C were found to be similar to 1.72 x 10(-6) .K-1 and similar to 1.93 x 10(-6) .K-1, respectively. Thermal conductivity (lambda) as low as 0.03 W.m(-1) K-1 was measured for the SiCN(O) and SiOC foams at room temperature (RT). The lambda of the ceramic struts were also assessed by using the Gibson-Ashby model and estimated to be 2.1 W.m(-1) K-1 for SiCN(O), and 1.8 W.m(-1) K-1 for SiOC.

Journal or Publication Title: Ceramics international
Number: 5
Publisher: Elsevier
Uncontrolled Keywords: Polymer derived ceramic; SiOC; SiCN(O); Foams; Thermal conductivity HIGH-TEMPERATURE BEHAVIOR; C-N CERAMICS; MECHANICAL-PROPERTIES; PYROLYSIS; AEROGELS; CONVERSION; OXIDATION
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
07 Department of Chemistry
07 Department of Chemistry > Fachgebiet Anorganische Chemie
Date Deposited: 12 Mar 2020 06:41
DOI: 10.1016/j.ceramint.2019.11.003
Official URL: https://www.sciencedirect.com/science/article/pii/S027288421...
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