Thermostructural composite structure with a compositional gradient, its manufacturing process
AssigneeSnecma Propulsion Solide
InventorsJacques Thebault, Laurent David
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Abstract
Thermostructural composite structure having a compositional gradient, formed from a porous core (5) made of a refractory having a pore volume content of greater than or equal to 80%. The core (5) lies between two intermediate layers (6a, 6b) comprising the carbon fiber reinforcement, densified by a matrix composed of the carbon phase and of a ceramic phase, and a refractory solid filler. Two monolithic ceramic shells (7a, 7b) cover the intermediate layers in order to give stiffness to the entire structure.
Claims11
A process for manufacturing a laminated thermostructural composite structure having a compositional gradient, comprising the following steps:
- a) machining of a preform in a porous refractory component, the preform having a pore volume content of greater than or equal to 80%;
- b) application of a liquid composition, containing a ceramic precursor polymer and a refractory solid filler, to all the accessible surfaces of the preform, crosslinking of the polymer and conversion of the crosslinked polymer into a ceramic by heat treatment in order to form an intermediate layer and to reduce the porosity at the surface of the preform;
- and
- c) formation of a ceramic coating on the immediate layer, said ceramic coating being deposited by chemical vapor infiltration so as to form a ceramic shell over all the external surfaces of the preform.
Dependencies are inferred from the claim text.