Sol-gel method for producing a composite material provided with an lithium aluminosilicate vitroceramic matrix

• Main Authors: TESSIER ARNAUD, TONEGUZZO PHILIPPE
• Format: Patent
• Language: English
• Published: 06.04.2006
• Subjects: CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES; METALLURGY; MINERAL OR SLAG WOOL; PERFORMING OPERATIONS; SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG, OR MIXTURESCONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS; TRANSPORTING; WORKING CEMENT, CLAY, OR STONE

Method for preparing a composite comprising a fibre reinforcement and a glass-ceramic matrix essentially consisting of lithium aluminosilicate (LAS), the said method comprising the following successive steps: a) preparation of a sol of precursors of the matrix, comprising a lithium salt, a reactive binder containing alumina, colloidal silica and a solvent, and homogenization of the said sol; b) impregnation of the fibre reinforcement with the sol prepared in step a); c) drying of the impregnated fibre reinforcement, by means of which a gelled composite comprising a fibre reinforcement and a gelled matrix is obtained; and d) densification of the gelled composite of step c) at a temperature not exceeding 500° C.