Mechanical characterization of a polysiloxane-derived SiOC glass |
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| Affiliation: | 1. Laboratoire de Recherche en Mécanique Appliquée de l’ Université de Rennes 1, FRE-CNRS 2717 – Bât. 10B – Campus de Beaulieu, 35042 Rennes Cedex, France;2. Institut für Materialwissenschaft, Technische Universität Darmstadt, Petersenstr. 23, D-64287 Darmstadt, Germany;3. LAIN, UMR 5011, Université Montpellier II, Place E. BATAILLON, CC 082, F-34095 Montpellier Cedex, France;1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072, China;2. MOE Key Laboratory of Space Applied Physics and Chemistry, Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072, China;1. Department of Physics, Konkuk University, Seoul 143-701, Republic of Korea;2. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, 163 Seoulsiripdae-ro, Dongdaemun-ku, Seoul 130-743, Republic of Korea;3. Energy and Environmental Division, Korea Institute of Ceramic Engineering and Technology, Seoul 153-801, Republic of Korea |
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| 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. |
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