Method of manufacturing a composite material with an interphase layer of pyrolytic carbon of the lamellar microtexture between the reinforcing fibers and matrix, and material such as obtained by the process.

摘要

The lamellar interphase in pyrocarbon is formed on the reinforcing fibers inside a chamber which are made of a plurality of successive cycles, each comprising: the introduction of a reaction gas, in which the precursor of the pyrocarbon is selected from alkanes, to the exclusion of the methane taken as a single component, alkenes and alkynes and the aromatic hydrocarbons and their mixtures, the holding of the gaseous phase in the chamber during a first time interval having a predetermined duration, in order to form an interphase layer having a controlled thickness of the order of one nanometer, and then the removal of the products of the reaction gas during a second time interval, the cycles are carried out consecutively in the chamber until the desired thickness of the interphase, so as to produce a highly anisotropic lamellar interphase, the texture in the lattice fringe has undulating fringes whose total length (l2) is at least equal to 4 nm in average and maximum values exceeding 10 nanometers.