TU Darmstadt / ULB / TUbiblio

Effect of composition and high-temperature annealing on the local deformation behavior of silicon oxycarbides

Stabler, Christina and Celarie, Fabrice and Rouxel, Tanguy and Limbach, Rene and Wondraczek, Lothar and Riedel, Ralf and Ionescu, Emanuel (2019):
Effect of composition and high-temperature annealing on the local deformation behavior of silicon oxycarbides.
In: Journal of the European Ceramic Society, Elsevier Science Ltd, England, pp. 2287-2296, 39, (7), ISSN 09552219, DOI: 10.1016/j.jeurceramsoc.2019.02.024, [Online-Edition: https://www.sciencedirect.com/science/article/abs/pii/S09552...],
[Article]

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 beta-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 beta-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 beta-SiC nanoparticles upon thermal annealing was observed. It is suggested that this is responsible for the increase in Young's modulus.

Item Type: Article
Erschienen: 2019
Creators: Stabler, Christina and Celarie, Fabrice and Rouxel, Tanguy and Limbach, Rene and Wondraczek, Lothar and Riedel, Ralf and Ionescu, Emanuel
Title: Effect of composition and high-temperature annealing on the local deformation behavior of silicon oxycarbides
Language: English
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 beta-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 beta-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 beta-SiC nanoparticles upon thermal annealing was observed. It is suggested that this is responsible for the increase in Young's modulus.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 39
Number: 7
Publisher: Elsevier Science Ltd, England
Uncontrolled Keywords: Silicon oxycarbide; Elastic properties; Poisson's ratio; Plastic deformation; Thermal annealing STRAIN-RATE SENSITIVITY; MECHANICAL CHARACTERIZATION; STRUCTURAL-CHARACTERIZATION; PHASE-SEPARATION; ELASTIC-MODULUS; INSTRUMENTED INDENTATION; NANOINDENTATION CREEP; DEFECT RESISTANCE; GLASS-CERAMICS; CONSTANT-LOAD
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
Date Deposited: 23 Apr 2019 05:31
DOI: 10.1016/j.jeurceramsoc.2019.02.024
Official URL: https://www.sciencedirect.com/science/article/abs/pii/S09552...
Funders: Deutsche Forschungsgemeinschaft (IC), 64/7-1
Export:

Optionen (nur für Redakteure)

View Item View Item