Record number :
1000797
Title of article :
Structural modifications of carbon–carbon composites under high temperature and ion irradiation
Author/Authors :
T. Paulmiera، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2005
Pages :
18
From page :
376
To page :
393
Abstract :
Carbon–carbon composites are the most interesting materials for the conception of the thermal shield of the solar probe space mission designed to study the solar wind and solar corona. The physico-chemical behavior and the structural modifications of some carbon–carbon composites at high temperature and under proton irradiation have been studied using SEM, XRD and Raman spectroscopy. The characterization of the as-received carbon–carbon composites show that the processing routes and the fiber preform have a strong influence on the microstructure of the composites: the fibrous preform 2.5D, the liquid consolidation and a final heat treatment allows to enhance drastically the graphitization degree of the carbon matrix and the fibers and the size of the crystallites. The high temperatures induce especially a decrease of the open porosity due to an amorphous carbon deposit at the surface of the material. This evolution has been observed mainly for the 2.5D structure. The high temperatures come to an evolution of the microstructure with a better crystallinity, an increase of the size and orientation of the crystallites of the fibers and matrix. The 2D structure presents, however, an increase of the disorder with the temperature. Finally, the hydrogen irradiation has only a very weak influence on the inner and surface degradation of the carbon–carbon composites.
Keywords :
Carbon–carbon composites , Heat treatment , ion irradiation , X-ray diffraction , Microstructure , Radiation damage , Scanning electronic microscopy
Journal title :
Applied Surface Science
Journal title :
Applied Surface Science
Serial Year :
2005
Link To Document :
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