Patent ID: 8039053

Claim:
A method of fabricating a composite material part comprising fiber reinforcement densified by a ceramic matrix, the method comprising: using chemical vapor infiltration to form an interphase coating on the fibers to be used for constituting the fiber reinforcement without the fibers being held in shape by a tooling, the interphase coating comprising at least an inner layer in contact with the fibers for providing embrittlement relief to the composite material, and an outer layer for bonding with the ceramic matrix and the interphase coating having a thickness of less than 100 nanometers; after forming the interphase coating, shaping a fiber preform to constitute the fiber reinforcement of the composite material part, the fiber preform being formed of said fibers provided with the interphase coating, and holding the fiber preform by means of a tooling to keep its shape; consolidating the preform while kept in its shape by means of said tooling by partial densification using a consolidating phase of ceramic matrix bonding the fibers to one another to obtain a consolidated preform able to conserve its shape on its own without help from tooling, consolidation being performed by impregnating the fiber preform with a liquid composition containing a precursor for the material of the ceramic matrix consolidating phase, and transforming the precursor into ceramic; and continuing densification of the consolidated preform by an additional ceramic matrix phase.