Effect of composition and high-temperature annealing on the local deformation behavior of silicon oxycarbides |
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| Affiliation: | 1. Technische Universität Darmstadt, Institute of Materials Science, Otto-Berndt-Str. 3, D-64287, Darmstadt, Germany;2. University of Rennes 1, Campus Beaulieu, Physics Institute, IPR UMR UR1-CNRS 6251, Glass and Mechanics Department, 35042, Rennes cedex, France;3. University of Jena, Otto Schott Institute of Materials Research, Fraunhoferstr. 6, D-07743, Jena, Germany;1. CAS Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China;2. Department of Materials Science and Engineering, China University of Mining and Technology, Beijing 100083, China;3. ZhongkeLangfang Institute of Process Engineering, Fenghua Road No 1, Langfang Economic &Tchnical Development Zone, Hebei Province, China;1. Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, China;2. College of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, China;3. College of Information Science and Engineering, Guilin University of Technology, Guilin, 541004, China;1. Laboratoire Interdisciplinaire Carnot de Bourgogne UMR 6303 CNRS, Université de Bourgogne, 9 Avenue Alain Savary, Dijon 21078, France;2. Department of Natural Sciences, Lebanese American University, Byblos P.O.Box 36, Lebanon |
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| Abstract: | Silicon oxycarbides with varying compositions were investigated concerning their elastic and plastic properties. Additionally, the impact of thermal annealing on their elastic properties was assessed. Phase separation of SiOC seems to have no significant impact on Young’s modulus (high values of β-SiC compensate the low values of the vitreous silica matrix) and hardness. However, it leads to an increase in Poisson’s ratio, indicating an increase in the atomic packing density. The phase composition of SiOC significantly influences Young’s modulus, hardness, brittleness and strain-rate sensitivity: the amount of both β-SiC and segregated carbon governs Young’s modulus and hardness, whereas the fraction of free carbon determines brittleness and strain-rate sensitivity. Thermal annealing of SiOC glass-ceramics leads to an increase in Young’s modulus. However, the temperature sensitivity of Young’s modulus and Poisson’s ratio is not affected, indicating the glassy matrix being stable during thermal annealing. A slightly improved ordering of the segregated carbon and the β-SiC nanoparticles upon thermal annealing was observed. It is suggested that this is responsible for the increase in Young’s modulus. |
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| Keywords: | Silicon oxycarbide Elastic properties Poisson’s ratio Plastic deformation Thermal annealing |
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