Effect of PAN-based and pitch-based carbon fibres on microstructure and properties of continuous Cf/ZrB2-SiC UHTCMCs

In this paper the microstructure and mechanical properties of two different Cf/ZrB2-SiC composites reinforced with continuous PyC coated PAN-derived fibres or uncoated pitch-derived were compared. Pitch-derived carbon showed a lower degree reaction matrix phase during sintering compared to PyC/PAN-derived fibres. The reason lies in carbon. presence coating for was found be essential limit at fibre/matrix interface SPS. However, bundles more difficult infiltrate, resulting less homogeneous microstructure. As far as are concerned, specimens provided higher strengths damage tolerance than fibres, due fibre pull-out. On other hand, weaker resulted interlaminar shear, off-axis strength ablation resistance.