C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 35/80 (2006.01) C04B 35/573 (2006.01) C04B 35/84 (2006.01) C04B 41/85 (2006.01) F16D 69/02 (2006.01)
Patent
CA 2516275
The invention relates to a method of siliconising thermostructural composite materials and to the parts thus produced. According to the invention, an aerogel or xerogel, constituting a precursor of refractory material, is formed within the porosity of the thermostructural porous composite material. The aforementioned precursor is transformed by means of pyrolysis in order to produce an aerogel or xenogel of refractory material and, subsequently, siliconisation is performed by means of impregnation with a silicon melt-type phase. The aerogel or xerogel is formed by impregnating the composite material with a composition containing at least one organic, organometalloid or organometallic compound in solution, followed by an in situ gelling step. The inventive method can be used to improve the tribiological properties or the thermal conductivity of C/C or C/SiC composite parts or to seal such parts.
On forme au sein de la porosité du matériau composite thermostructural poreux un aérogel ou un xérogel constituant un précurseur de matériau réfractaire, on transforme le précurseur par pyrolyse pour obtenir un aérogel ou un xérogel en matériau réfractaire, puis on réalise une siliciuration par imprégnation par une phase de type silicium en fusion. L'aérogel ou xérogel est formé par imprégnation du matériau composite par une composition contenant au moins un composé organique, organométalloïdique ou organométallique en solution, et gélification in situ. Le procédé est applicable à l'amélioration des propriétés tribologiques ou de la conductibilité thermique de pièces en matériau composite C/C ou C/SiC ou à l'étanchéification de telles pièces.
Ichard Jean-Christophe
Pailler Rene
Thebault Jacques
Sim & Mcburney
Snecma Propulsion Solide
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