Ceramics-Silikáty 44 (2) 54-60 (2000) 

NFLUENCE OF MATRIX DENSIFICATION UPON STRUCTURE AND ELASTIC PROPERTIES OF CARBON-CARBON COMPOSITE SHELLS

P. Glogar, M. Černý, M. Krula 

Carbonisation of "green" composite shells reinforced with carbon yarn braid and soaked with phenolic resin yielded carbon-carbon composite cylindrical shells. The obtained porous composite material was densified by impregnation with various precursors of secondary carbon matrix. By measuring the longitudinal and tangential elastic moduli of the composite shells by a resonant frequency technique their gradual stiffening was monitored. The roles of the braiding angle and of the processing parameters (heat treatment, densification, and impregnant type) upon constitution of the composite shell elasticity are discussed.