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Mechanical characterization of a polysiloxane-derived SiOC glass

Moysan, Claude ; Riedel, Ralf ; Harshe, Rahul ; Rouxel, Tanguy ; Augereau, Franck (2007):
Mechanical characterization of a polysiloxane-derived SiOC glass.
In: Journal of the European Ceramic Society, 27 (1), pp. 397-403. SciVerse, ISSN 09552219,
[Article]

Abstract

Silicon oxycarbide glass with the composition Si1.0O1.6C0.8 was synthesized from a commercial polysiloxane by polymer pyrolysis. Dense SiOC samples were obtained by cross linking of the polysiloxane followed by warm pressing to form cylindrical samples and subsequent pyrolysis of the shaped polymer at 1100 °C in Ar. Hardness (H), Young's modulus (E) and Poisson's ratio (ν) of the as-prepared SiOC glass were evaluated from indentation studies and from acoustic microscopy. Indentation studies showed that E depends on the applied load and amounts to 90 GPa for low load and to 180 GPa for high load. Average values of 6.4 and 101 GPa were obtained for H and E, respectively, by the Vickers indentation method. Acoustic microscopy analysis yielded values of 96 GPa and 0.11 for E and ν, respectively. Compared to vitreous silica, the Young's modulus of the SiOC glass is about 1.3–1.5 times higher. To the knowledge of the present authors, the measured Poisson's ratio (ν = 0.11) is the lowest reported so far for glasses and polycrystalline ceramics.

Item Type: Article
Erschienen: 2007
Creators: Moysan, Claude ; Riedel, Ralf ; Harshe, Rahul ; Rouxel, Tanguy ; Augereau, Franck
Title: Mechanical characterization of a polysiloxane-derived SiOC glass
Language: English
Abstract:

Silicon oxycarbide glass with the composition Si1.0O1.6C0.8 was synthesized from a commercial polysiloxane by polymer pyrolysis. Dense SiOC samples were obtained by cross linking of the polysiloxane followed by warm pressing to form cylindrical samples and subsequent pyrolysis of the shaped polymer at 1100 °C in Ar. Hardness (H), Young's modulus (E) and Poisson's ratio (ν) of the as-prepared SiOC glass were evaluated from indentation studies and from acoustic microscopy. Indentation studies showed that E depends on the applied load and amounts to 90 GPa for low load and to 180 GPa for high load. Average values of 6.4 and 101 GPa were obtained for H and E, respectively, by the Vickers indentation method. Acoustic microscopy analysis yielded values of 96 GPa and 0.11 for E and ν, respectively. Compared to vitreous silica, the Young's modulus of the SiOC glass is about 1.3–1.5 times higher. To the knowledge of the present authors, the measured Poisson's ratio (ν = 0.11) is the lowest reported so far for glasses and polycrystalline ceramics.

Journal or Publication Title: Journal of the European Ceramic Society
Journal volume: 27
Number: 1
Publisher: SciVerse
Uncontrolled Keywords: Precursors-organic, Mechanical properties, Glass; Poisson's ratio, SiOC
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 17 Apr 2012 09:36
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2006.01.016
Identification Number: doi:10.1016/j.jeurceramsoc.2006.01.016
Funders: R.H. thanks the Federal State of Hessen, Germany, for providing a PhD grant.
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