Patent ID: 8221836

Claim:
A method of fabricating a thermostructural composite material part, the method comprising the following successive steps: using chemical vapor infiltration to form a first continuous interphase layer of a single material on the fibers of a fiber structure made of refractory fibers, the first interphase layer having a thickness of no more than 100 nanometers; forming a consolidated fiber preform by shaping the fiber structure, with the first interphase layer and impregnated with a consolidation composition that includes a carbon or ceramic precursor resin, into a desired shape; transforming the resin by pyrolysis into a discontinuous solid residue formed by grains of carbon or ceramic; then using chemical vapor infiltration to form a second continuous interphase layer covering the first interphase layer and the solid pyrolysis residue grains; and then densifying the preform with a refractory matrix.