Method of making a fiber preform for manufacturing parts of a composite material of the carbon/carbon type incorporating ceramic particles, and products obtained thereby
AssigneeMessier-Bugatti
InventorsSandrine Baud, Alain Giraud
Life of this patent
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Abstract
One or more two-dimensional fiber fabrics of carbon or carbon precursor fibers are impregnated (58, 59) by a solution or a suspension capable of allowing a dispersion of discrete ceramic particles to remain in the fiber fabric, and a fiber preform (51) is made by superposing plies formed of two-dimensional fabric made of carbon or carbon precursor fibers, the plies being bonded to one another, and at least some of the plies being at least partially formed of a previously-impregnated two-dimensional fabric. The field of application is particularly that of friction parts made of C/C composite material with incorporated ceramic particles.
Claims13
A method of making a brake disk of carbon/carbon composite material incorporating ceramic particles, the brake disk having a friction first portion and a second portion adjacent the friction first portion and mechanically transmitting braking torque, the method comprising the steps of:
- a) impregnating one or more two-dimensional fiber fabrics of carbon or carbon precursor fibers in a colloidal suspension or a sol-gel solution containing ceramic particles or a precursor of ceramic particles;
- b) superposing together first fiber plies formed of a two-dimensional fiber fabric impregnated with said colloidal suspension or sol-gel solution in a first portion of a fiber preform corresponding to the friction portion of the brake disk and second fiber plies of a two-dimensional fiber fabric not impregnated with said colloidal suspension or sol-gel solution in a second portion of the fiber preform corresponding to the second portion of the brake disk;
- c) drying the impregnated fiber fabric to leave on the fibers of said first fiber plies a dispersion of discrete ceramic particles;
- d) bonding together the first and second fiber plies to obtain a brake disk fiber preform having said first portion formed of fiber plies and ceramic particles dispersed on the fiber plies of the first portion and a second portion formed of fiber plies free or practically free of ceramic particles, said fiber plies being bonded together progressively as they are superposed;
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- e) subsequently densifying the brake disk fiber preform with an added carbon matrix.
Dependencies are inferred from the claim text.