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Microcracks in Carbon/Carbon Composites: A Microtomography Investigation using Synchrotron Radiation

Published online by Cambridge University Press:  21 March 2011

Oskar Paris,
Herwig Peterlik,
Dieter Loidl,
Christoph Rau and
Timm Weitkamp
Oskar Paris
Affiliation:
Metal Physics Institute, University of Leoben, and Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstrasse 12, A-8700 Leoben, Austria
Herwig Peterlik
Affiliation:
Materials Physics Institute, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria
Dieter Loidl
Affiliation:
Materials Physics Institute, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria
Christoph Rau
Affiliation:
European Synchrotron Radiation Facility (ESRF), 6 rue Jules Horowitz, B. P. 220, F-38043 Grenoble Cédex, France
Timm Weitkamp
Affiliation:
European Synchrotron Radiation Facility (ESRF), 6 rue Jules Horowitz, B. P. 220, F-38043 Grenoble Cédex, France
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Abstract

The mechanical properties of brittle matrix composites such as carbon/carbon (C/C) are closely related to the generation and propagation of microcracks. A better understanding of the role of microcracking requires a quantification of the three-dimensional morphology of the crack network. In this study we demonstrate that phase contrast microtomography using synchrotron radiation is a unique tool to get 3D information about cracks in C/C. This is shown for three different C/C specimens subjected to different final heat treatment temperatures (HTT). The results are discussed qualitatively with respect to the influence of HTT on the distribution of microcracks and their relevance for the mechanical properties of C/C.

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