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The morphology of silicon carbide in C/C-SiC composites

Schulte-Fischedick, J. and Zern, A. and Mayer, J. and Rühle, M. and Frieß, M. and Krenkel, W. and Kochendörfer, R. (2002) The morphology of silicon carbide in C/C-SiC composites. Journal of Materials Science and Engineering A, Elsevier Science, 332 (1-2), pp. 146-152.

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Abstract

In the present investigations C/C-SiC has been studied by means of SEM, x-ray diffraction (XRD) and TEM to reveal the morphology of the silicon carbide areas. It was found that there exist two different areas of SiC, a fine grained beta layer with a high amount of stacking faults at the C-SiC interface, and a zone of coarser beta SiC at the SiC-Si interface. From these observations, reaction mechanisms governing the siliconization of porous C/C preforms are preposed. After an initial reaction of the carbon with silicon vapour, liquid silicon has to diffuse through the already formed SiC. A violent reaction far away from equilibrium conditions and a high number of nucleation sites leads to the observed formation of a fine grained SiC with a high density of stacking faults. Thermodynamically this is an instable configuration so that the coarser grained zone emerges by solution and precipitation.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2003,
Title:The morphology of silicon carbide in C/C-SiC composites
Authors:
AuthorsInstitution or Email of Authors
Schulte-Fischedick, J.UNSPECIFIED
Zern, A.UNSPECIFIED
Mayer, J.UNSPECIFIED
Rühle, M.MPI
Frieß, M.UNSPECIFIED
Krenkel, W.UNSPECIFIED
Kochendörfer, R.UNSPECIFIED
Date:2002
Journal or Publication Title:Journal of Materials Science and Engineering A, Elsevier Science
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:332
Page Range:pp. 146-152
Status:Published
Keywords:C/C-SiC, ceramic matrix composites, liquid silicon infiltration, SiC formation
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:Space
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):UNSPECIFIED
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 22:30

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