TU Darmstadt / ULB / TUbiblio

Elastic properties and fracture toughness of SiOC‐based glass‐ceramic nanocomposites

To, Theany and Stabler, Christina and Ionescu, Emanuel and Riedel, Ralf and Célarié, Fabrice and Rouxel, Tanguy (2020):
Elastic properties and fracture toughness of SiOC‐based glass‐ceramic nanocomposites.
In: Journal of the American Ceramic Society, 103 (1), Wiley, pp. 491-499, ISSN 00027820,
DOI: 10.1111/jace.16686,
[Online-Edition: https://ceramics.onlinelibrary.wiley.com/doi/full/10.1111/ja...],
[Article]

Abstract

Four different SiOC glass ceramics were synthesized and their fracture toughness (KIc) and fracture surface energy (γ) were assessed by means of the single‐edge precracked beam (SEPB) method. In addition, the elastic moduli were measured and the Vickers indentation behavior (hardness and microcracking) was characterized. In particular, the dependence of KIc on the free carbon content and on the fraction of crystallized nanoparticles (SiC, ZrO2, HfO2) was investigated. An increase in KIc, from about 0.73 to 0.99 MPa √m is observed as the free carbon content is increased from less than 1 to 12 vol%. The addition of Hf and Zr (resulting in 4.5 to 7.8 vol% HfO2 and ZrO2 nanoparticles) was found to increase KIc to an extent similar to the free carbon content. Moreover, predicted KIc values, assuming that the crack travels through all phases accounting for their respective volume fractions, disrupting the weakest links within the structural units, are in agreement with the experimental values.

Item Type: Article
Erschienen: 2020
Creators: To, Theany and Stabler, Christina and Ionescu, Emanuel and Riedel, Ralf and Célarié, Fabrice and Rouxel, Tanguy
Title: Elastic properties and fracture toughness of SiOC‐based glass‐ceramic nanocomposites
Language: English
Abstract:

Four different SiOC glass ceramics were synthesized and their fracture toughness (KIc) and fracture surface energy (γ) were assessed by means of the single‐edge precracked beam (SEPB) method. In addition, the elastic moduli were measured and the Vickers indentation behavior (hardness and microcracking) was characterized. In particular, the dependence of KIc on the free carbon content and on the fraction of crystallized nanoparticles (SiC, ZrO2, HfO2) was investigated. An increase in KIc, from about 0.73 to 0.99 MPa √m is observed as the free carbon content is increased from less than 1 to 12 vol%. The addition of Hf and Zr (resulting in 4.5 to 7.8 vol% HfO2 and ZrO2 nanoparticles) was found to increase KIc to an extent similar to the free carbon content. Moreover, predicted KIc values, assuming that the crack travels through all phases accounting for their respective volume fractions, disrupting the weakest links within the structural units, are in agreement with the experimental values.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 103
Number: 1
Publisher: Wiley
Uncontrolled Keywords: Fracture toughness; glass ceramic; hafnium; SEPB; silicon oxycarbide; zirconium; temperature; creep-behavior; silicon oxycarbide glasses; structural-characterization; phase; stability; energy
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: 30 Oct 2019 07:50
DOI: 10.1111/jace.16686
Official URL: https://ceramics.onlinelibrary.wiley.com/doi/full/10.1111/ja...
Projects: FP7 Ideas: European Research Council, Grant Number: 320506, German Science Foundation, Grant Number: IO 64/7-1
Export:
Suche nach Titel in: TUfind oder in Google
Send an inquiry Send an inquiry

Options (only for editors)

View Item View Item