Determination of Subcritical Crack Growth Parameters in Polymer-Derived SiOC Ceramics by Biaxial Bending Tests in Water Environment

Polymer‐derived SiOC ceramics were prepared by field‐assisted sintering at 1600°C. In order to characterize this material, X‐ray diffractometry, density measurements, and mechanical tests were performed. It was determined that the material is dense and predominantly amorphous with fine crystalline r...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2010-06, Vol.93 (6), p.1540-1543
Main Authors: Schell, Karl G., Bucharsky, Ethel C., Oberacker, Rainer, Hoffmann, Michael J.
Format: Article
Language:English
Subjects:
Amorphous materials
Bend tests
Ceramics
Crack propagation
Density
Fracture toughness
Inert
Polymers
Silica
Silica glass
Silicon dioxide
Sintering
Strength
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Summary:Polymer‐derived SiOC ceramics were prepared by field‐assisted sintering at 1600°C. In order to characterize this material, X‐ray diffractometry, density measurements, and mechanical tests were performed. It was determined that the material is dense and predominantly amorphous with fine crystalline regions of β‐SiC. A fracture toughness of 0.84 MPa·m1/2 was determined from single edge, v‐notched bending tests. Inert strength and subcritical crack growth parameters were derived from the ball‐on‐three‐balls tests carried out at different loading rates. The inert strength of 212 MPa and the crack growth exponent n of 15 are on a similar level as commonly expected for silica‐based glasses. Because of an enhanced crack growth parameter A0, the crack velocity of the SiOC material at a given stress intensity level is significantly reduced compared with silica glasses.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2009.03566.x