Silicon carbide reinforced silicon carbide composite

C - Chemistry – Metallurgy – 01 – B

Patent

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Details

C01B 33/02 (2006.01) B28B 1/26 (2006.01) B28B 1/52 (2006.01) B28B 23/00 (2006.01) C04B 35/573 (2006.01) C04B 35/65 (2006.01) C04B 35/80 (2006.01) E21D 11/38 (2006.01) E21F 16/02 (2006.01)

Patent

CA 2273100

This invention relates to a process comprising the steps of: a) providing a fiber preform comprising a non-oxide ceramic fiber with at least one coating, the coating comprising a coating element selected from the group consisting of carbon, nitrogen, aluminum and titanium, and the fiber having a degradation temperature of between 1400 °C and 1450 °C; b) impregnating the preform with a slurry comprising silicon carbide particles and between 0.1 wt.% and 3 wt.% added carbon; c) providing a cover mix comprising: i) an alloy comprising a metallic infiltrant and the coating element, and ii) a resin; d) placing the cover mix on at least a portion of the surface of the porous silicon carbide body; e) heating the cover mix to a temperature between 1410 °C and 1450 °C to melt the alloy; and f) infiltrating the fiber preform with the melted alloy for a time period of between 15 minutes and 240 minutes, to produce a ceramic fiber reinforced ceramic composite.

L'invention porte sur un procédé comportant les étapes suivantes: (a) prendre une préforme de fibres faite de fibres de céramique (mais pas d'oxyde) munie d'au moins un revêtement choisi parmi le carbone, l'azote, l'aluminium et le titane, lesdites fibres ayant une température de dégradation comprise entre 1400 DEG C et 1450 DEG C; (b) imprégner la préforme d'une bouillie comportant des particules de carbure de silicium et entre 0,1 % et 3 % en poids de carbone ajouté; (c) prendre un mélange de couverture comprenant: (i) un alliage fait de poudre infiltrante métallique et de l'élément de revêtement, et (ii) une résine; (d) placer le mélange de couverture sur une partie au moins de la surface du corps poreux de carbure de silicium; (e) chauffer le mélange de couverture entre 1410 DEG C et 1450 DEG C pour faire fondre l'alliage; et infiltrer la préforme de fibres à l'aide de l'alliage fondu pendant un temps compris entre 15 et 240 minutes de manière à obtenir un composite céramique renforcé par des fibres céramiques.

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