Process for the manufacture of a thermostructural composite...

Details Process for the manufacture of a thermostructural composite... Process for the manufacture of a thermostructural composite...

C - Chemistry, Metallurgy

04

B

C04B 35/80 (2006.01) C04B 35/84 (2006.01) C04B 41/45 (2006.01)

Patent

CA 2038859

The thermostructural composite material is produced by forming a fibrous preform made from refractory fibers coated with a sizing agent. The preform is densified by a refractory matrix, in particular ceramic, while a carbon interphase is provided between the fibers and the matrix. The fibrous preform is made from refractory fibers coated with a sizing agent of the type that leaves behind a carbon residue upon thermal deccmposition. The carbon interphase is produced by the thermal degradation of the sizing agent, occurring for example after the preform is made. The sizing agent is chosen among phenolic, acrylic and cellulose resins, and in particular carboxymethylcellulose.

e matériau composite thermostructural est fabriqué en façonnant une préforme fibreuse à partir de fibres réfractaires enduites d'un adhésif. La préforme est densifiée à l'aide d'une matrice réfractaire, notamment de la céramique, et une interphase de carbone est introduite entre les fibres et la matrice. La préforme fibreuse est fabriquée à partir de fibres réfractaires enduites d'un adhésif du type qui laisse un résidu de carbone après décomposition thermique. L'interphase de carbone est produite par dégradation thermique de l'adhésif qui se produit par exemple après la fabrication de la préforme. L'adhésif est choisi parmi les résines phénoliques, acryliques et cellulosiques, notamment la carboxyméthylcellulose.

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