C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
C03C 14/00 (2006.01)
Patent
CA 2508752
The invention relates to a method for producing a composite fibre-reinforced material provided with a vitroceramic matrix and substentially consisting of lithium alumosilicate (LAS). The inventive method successively consists: a) in preparing a sol for matrix precursors comprising a lithium salt, a reactive binder containing aluminium, colloidal silicon and a solvent and in homogenising said sol; b) in impregnating a fibrous reinforcement with the sol from a); c) in drying said impregnated fibrous reinforcement in such a way that a gelified composite material comprising a fibrous reinforcement and a gelified matrix is obtained; and d) in densifying the gelified composite material of c) at a temperature equal to or less that 500 ·C.
Procédé de préparation d'un matériau composite comprenant un renfort de fibres, et une matrice vitrocéramique constituée essentiellement d'aluminosilicate de lithium (LAS), ledit procédé comprenant les étapes successives suivantes a) préparation d'un sol de précurseurs de la matrice comprenant un sel de lithium, un liant réactif contenant de l'alumine, de la silice colloïdale, et un solvant, et homogénéisation dudit sol ; b) imprégnation du renfort de fibres par le sol préparé dans l'étape a) ; c) séchage du renfort de fibres imprégné moyennant quoi on obtient un matériau composite gélifié comprenant un renfort de fibres et une matrice gélifiée ; d) densification du matériau composite gélifié de l'étape c) à une température inférieure ou égale à 500~C.
Tessier Arnaud
Toneguzzo Philippe
Commissariat A. L'energie Atomique
Goudreau Gage Dubuc
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