Low-thickness thermostructural composite material part, and manufacture method
AssigneeHerakles
InventorsFrançois Charleux, Dominique Coupe, Eric Philippe
Life of this patent
Estimating the term…
Abstract
A thermostructural composite material part including carbon or ceramic fiber reinforcement densified by a matrix having at least one thin portion in which: the thickness of the part is less than 2 mm, or indeed less than 1 mm; the fiber reinforcement is made as a single thickness of multilayer fabric made of spread yarns having a weight of not less than 200 tex; the fiber volume ratio lies in the range 25% to 45%; and the ratio between the number of layers of the multilayer fabric and the thickness in millimeters of the part is not less than four.
Claims7
A method of fabricating a thermostructural composite material part comprising making a carbon or ceramic fiber preform and densifying the preform with a matrix, method in which a single thickness of multilayer fabric having yarns weighing not less than 200 tex is used for making at least a portion of the preform having a total multilayer thickness of less than 2 mm, wherein, in order to make said preform portion, the method comprises:
- making a multilayer fabric having yarns weighing not less than 200 tex;
- subjecting the multilayer fabric to an operation of spreading the yarns so as to reduce the thickness of the multilayer fabric;
- and
- making said preform portion from the spread multilayer fabric, a ratio between the number of layers of warp yarns of the multilayer fabric and the thickness in millimeters of said preform portion being not less than four;
- a thread count of the multilayer fabric during weaving being selected so as to obtain a volume fiber ratio lying in the range 25% to 45% in the fiber preform.
Dependencies are inferred from the claim text.