The composite material protege against oxidation by matrix self - cicatrizing and its method of manufacturing

摘要

PCT No. PCT/FR96/00467 Sec. 371 Date Sep. 26, 1997 Sec. 102(e) Date Sep. 26, 1997 PCT Filed Mar. 28, 1996 PCT Pub. No. WO96/30317 PCT Pub. Date Oct. 3, 1996A composite material protected by oxidation at intermediate temperatures not exceeding 850 DEG C. comprises fiber reinforcement densified by a matrix which includes at least one self-healing phase including a glass-precursor component such as B4C or an Si-B-C system, together with excess free carbon (C) at a mass percentage lying in the range 10% to 35%. The, or each, self-healing phase can be interposed between two ceramic matrix phases, e.g. of SiC. While the material is exposed to an oxidizing medium, oxidation of the free carbon promotes oxidation of the precursor and transformation thereof into a glass capable of plugging the cracks in the matrix by self-healing.