Image icon  Carbon-carbon composite

 
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Description: Carbon-carbon composites are manufactured from continuous carbon fibres which are woven in a two or three dimensional pattern. The fibres are then impregnated with a polymeric resin. After the component has been shaped and cured the matrix is pyrolysed by heating in an inert atmosphere. This converts the matrix to carbon chain molecules which are densified by further heat treatments. The resulting composite consists of the original carbon fibres in a carbon matrix.

Carbon-carbon composites have low density, high strength and high modulus. These properties are retained to temperatures above 2000°C. Creep resistance and toughness are also high, and the high thermal conductivity and low thermal expansion coefficient provide thermal shock resistance. The woven structure of this composite can be seen in the low magnification micrograph. At high magnification, the fibres can be resolved. The fibres are continuous, but appear to be discontinuous as they are not parallel to the section plane of the sample.
Keywords: carbon-carbon composite • composite material • polymeric resin • pyrolysis • toughness • woven continuous carbon fibres
Categories: Science approaches > Deformation & failure > Creep
Science approaches > Microstructure
Materials > Hybrids > Composites
Properties > Mechanical & thermal > Creep resistance
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: Dr J Marrow, Department of Materials Science, University of Manchester and UMIST
DoITPoMS, University of Cambridge
Published by: DoITPoMS, University of Cambridge
License: This resource is released under the Creative Commons Attribution Non-Commercial Share Alike license (2.0 UK: England & Wales).
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Date created: 07 November 2002
Date added: 21 August 2009
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Resource ID: 1699