Fibre-reinforced composite ceramics infiltrated with molten...

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 35/573 (2006.01) C04B 35/80 (2006.01) F16D 69/02 (2006.01)

Patent

CA 2284614

The invention concerns fibre-reinforced composite ceramics infiltrated with molten metal and comprising high-temperature fibres in particular based on Si/C/B/N, which are bound in terms of reaction to an Si- based matrix. The invention also concerns a method of producing such ceramics. The molten silicon used for infiltration purposes contains additions of iron, chromium, titanium, molybdenum, nickel or aluminium, molten silicon containing approximately 5 to 50 weight % iron and approximately 1 to 10 weight % chromium being particularly preferred. The production method is simpler than conventional molten silicon infiltration methods and imparts improved properties to the composite ceramics.

L'invention concerne une céramique composite renforcée par fibres, infiltrée avec une matière fondue, comportant des fibres résistant à des températures élevées, notamment à base de Si/C/B/N, qui sont liées à une matrice à base de Si, par réaction. L'invention concerne en outre un procédé permettant de produire une telle céramique. Le silicium fondu utilisé pour le processus d'infiltration de matière fondue, contient des adjonctions de fer, de chrome, de titane, de molybdène, de nickel ou d'aluminium, la préférence allant en particulier à de silicium fondu contenant approximativement entre 5 et 50 % en poids de fer et approximativement 1 et 10 % en poids de chrome. Il en résulte un procédé de production simplifié comparativement aux procédés classiques d'infiltration avec du silicium fondu, ainsi que de meilleures propriétés de la céramique composite.

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