Low-thickness thermostructural composite material part, and manufacture method
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.
1. A part made of thermostructural composite material comprising carbon or ceramic fiber reinforcement densified by a matrix, wherein, in at least a portion of the part:
the thickness of the part is less than 2 mm;
the fiber reinforcement is constituted by a single thickness of multilayer fabric made up of spread yarns weighing at least 200 tex;
the fiber reinforcement having a total multilayer thickness of less than 2 mm;
the fiber volume ratio lies in the range 25% to 45%; and
the ratio between the number of layers of warp yarns of the multilayer fabric and the thickness in millimeters of the part is not less than four.
2. A part according to claim 1 , wherein, in at least said portion of the part, the part has a thickness of less than 1 mm.
3. A part according to claim 1 , wherein the number of layers of warp yarns of the multilayer fabric is not less than three.
4. A part according to claim 1 , wherein the multilayer fabric has a multi-plain, multi-serge, or multi-satin type weave.
5. A part according to claim 1 , wherein the matrix is made at least partially of ceramic.
6. A part according to claim 5 , constituting an afterbody part of a gas turbine aeroengine.
7. A part according to claim 1 , constituting at least a portion of a rocket engine nozzle exhaust cone.