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Influence of diamond particles content on the critical load for crack initiation and fracture toughness of SiOC glass–diamond composites

Sellappan, Pathikumar and Guin, Jean-Pierre and Rocherulle, Jean and Celarie, Fabrice and Rouxel, Tanguy and Riedel, Ralf (2013):
Influence of diamond particles content on the critical load for crack initiation and fracture toughness of SiOC glass–diamond composites.
In: Journal of the European Ceramic Society, 33 (4), Elsevier Science Publishing, pp. 847-858, ISSN 09552219,
[Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2012.10.012],
[Article]

Abstract

The crack initiation load and fracture toughness were characterized as a function of diamond particle content, up to 25 vol%, in silicon oxycarbide glass matrix by means of Vickers indentation and single edge notch beam (SENB) technique, respectively. The larger fracture toughness value of 3.21 ± 0.3 MPa m1/2 was reached for 20 vol% diamond content composites and the value was 4 times higher than that of the unreinforced glass. The addition of diamond particles greatly influenced the crack initiation load, which increased from 2.9 to 49.0 N. The enhancement in the fracture toughness and crack initiation load can be explained by both the intrinsic mechanical properties of diamond (especially the elastic properties; E ∼ 1100 GPa) and the diamond/SiOC glass interfacial bonding. A clear correlation was found between the fracture energy, the reinforced interparticle spacing and the residual stress arising upon cooling due to thermal expansion mismatch between the matrix and the diamond particles.

Item Type: Article
Erschienen: 2013
Creators: Sellappan, Pathikumar and Guin, Jean-Pierre and Rocherulle, Jean and Celarie, Fabrice and Rouxel, Tanguy and Riedel, Ralf
Title: Influence of diamond particles content on the critical load for crack initiation and fracture toughness of SiOC glass–diamond composites
Language: English
Abstract:

The crack initiation load and fracture toughness were characterized as a function of diamond particle content, up to 25 vol%, in silicon oxycarbide glass matrix by means of Vickers indentation and single edge notch beam (SENB) technique, respectively. The larger fracture toughness value of 3.21 ± 0.3 MPa m1/2 was reached for 20 vol% diamond content composites and the value was 4 times higher than that of the unreinforced glass. The addition of diamond particles greatly influenced the crack initiation load, which increased from 2.9 to 49.0 N. The enhancement in the fracture toughness and crack initiation load can be explained by both the intrinsic mechanical properties of diamond (especially the elastic properties; E ∼ 1100 GPa) and the diamond/SiOC glass interfacial bonding. A clear correlation was found between the fracture energy, the reinforced interparticle spacing and the residual stress arising upon cooling due to thermal expansion mismatch between the matrix and the diamond particles.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 33
Number: 4
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Polymer derived ceramics, Silicon oxycarbide glass–diamond composites, Fracture toughness, Crack initiation, Surface damage resistance
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: 04 Feb 2014 09:26
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2012.10.012
Identification Number: doi:10.1016/j.jeurceramsoc.2012.10.012
Funders: P. Sellappan acknowledges the Ministry of Higher Education and Research of France for the fellowship. , Région Bretagne (Brittany, France) is acknowledged for instrumental facilities. , German Research Foundation (DFG, Priority Program 1181), Bonn, Germany, and the Fonds der Chemischen Industrie, Frankfurt, Germany, are acknowledged for financial support.
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