This paper deals with the study of a new generation of ceramic matrix composites, SiCf-SiBC, which
consists of a 2.5D perform of SiC fibers and of a self sealing multilayered matrix. Three different batches of
these CMCs have been investigated in a morphological point of view thanks to the observations performed at the
mesoscopic scale by scanning electron microscopy and automatic image analysis, and also at a microscopic scale
by transmission electron microscopy. Through this study, a lot of care was taken about the description of the
pyrocarbon interphase and of the different matrix interfaces, which play a key role in the damage features, and
more specially in the deflection of the matrix microcracks developed through tested mechanical composites.