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

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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 -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.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2009.03566.x

Affiliations: Institute for Ceramics in Mechanical Engineering, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany

Publication date: June 1, 2010

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