MECHANICAL-BEHAVIOR OF 2D-C-C/TIC COMPOSITES MADE FROM A 2D-C-C PREFORM DENSIFIED WITH TIC BY CVI

Compression testing has been performed on 2D-C-C/TiC ceramic/ceramic composites made from a stack of carbon fiber fabrics consolidated by pyrocarbon and densified by TiC using chemical vapor infiltration. The load was applied either parallel (para) or perpendicular (ortho) to the carbon fabric layers, and the compression behavior of the materials was studied as a function of the TiC volume fraction and thus of the residual porosity. The composites are found to exhibit partly linear elastic and partly inelastic behavior in both load directions, the extent of the elastic region increasing with increasing TiC densification. Failure modes of the composites are also discussed.