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Determination of Subcritical Crack Growth Parameters in Polymer‐Derived SiOC Ceramics by Biaxial Bending Tests in Water Environment
Author(s) -
Schell Karl G.,
Bucharsky Ethel C.,
Oberacker Rainer,
Hoffmann Michael J.
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03566.x
Subject(s) - materials science , composite material , ceramic , fracture toughness , inert , sintering , bending , amorphous solid , flexural strength , ball (mathematics) , fracture mechanics , polymer , toughness , geometry , chemistry , physics , mathematics , organic chemistry , quantum mechanics
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·m 1/2 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 A 0 , the crack velocity of the SiOC material at a given stress intensity level is significantly reduced compared with silica glasses.