C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 35/80 (2006.01) C04B 35/01 (2006.01)
Patent
CA 2214465
A composite material protected by oxidation at intermediate temperatures not exceeding 850°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.
Un matériau composite protégé par l'oxydation aux températures intermédiaires, n'excédant pas 850 DEG C, comprend un renfort fibreux densifié par une matrice qui comporte au moins une phase autocicatrisante comprenant un constituant précurseur de verre, tel que B4C ou un système Si-B-C, et du carbone libre (C) en excès avec un pourcentage massique compris entre 10 et 35 %. La ou chaque phase autocicatrisante peut être intercalée entre deux phases de matrice céramique, par exemple SiC. Lors de l'exposition du matériau à un milieu oxydant, l'oxydation du carbone libre favorise celle du précurseur et sa transformation en verre capable de colmater des fissures de la matrice par autocicatrisation.
Abbe Francois
Charvet Jean-Luc
Goujard Stephane
Lamazouade Ghislaine
Leluan Jean-Luc
Sim & Mcburney
Societe Europeenne de Propulsion
Societe Nationale D'etude Et de Construction de Moteurs D'aviati
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