Stress-rupture of nicalon/SiC continuous fiber ceramic composites in air at 950°C

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Abstract

The stress-rupture behavior of plain-weave CG-Nicalon/ enhanced SiC was studied in air at 950°C. It was found that this material exhibits delayed failure and that the lives of specimens subjected to constant stress levels of 80,100, and 120 MPa were 21.6, 9.6, and 2.7 h, respectively. The strain histories of these tests revealed a continuous increase of the specimen compliance and accelerated deformation prior to failure. It is shown that both the shape of the strain vs time curves and the time dependence of the loss of strength can be explained using a simple model based on the oxidation-induced stress-rupture of the reinforcing fiber bundles.

Original languageEnglish
Pages (from-to)3268-3272
Number of pages5
JournalJournal of the American Ceramic Society
Volume80
Issue number12
DOIs
StatePublished - Dec 1997

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