• Carbon-carbon composites are basic materials for high temperatures applications (1400 ˚C -3000 ˚C) such as: re-entry shields, launching sub-systems, modern brake systems for aircraft
• C-C composites consist mainly of a reinforcing structure made of carbon fiber (unidirectional, fabric, chopped fibers or carbon felt) and a matrix, which through an adequate thermal treatment turn into carbon
• The impregnation materials are: phenolic resins or petroleum pitch (mesophase)

Fig 1. Carbon nanotubes additivated mesophase (petroleum pitch) SEM image

 

• The technology consists of the following: the matrix- fiber mixture is carbonized and then re impregnated 3- 4 times with pitch or different resins for the increase of strength and density

Fig. 2. The variation of C-C composites density with the number of impregnation procedures	Fig. 3. The variation of mechanical strength of C-C composites with the number of cycles

 

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