Method for injecting ceramic powders with filter created in situ in the fibrous preform

A method for injecting ceramic particles into a fibrous texture comprising:

• placing a fibrous texture in a mold, the fibrous texture being interposed between one or more first ports and one or more second ports,
• injecting through the one or more first ports a first suspension comprising a powder of filtration particles having a particle size greater than a size of interstices of a pore network of the fibrous texture;
• injecting through the one or more first ports a first suspension comprising a powder of filtration particles having a particle size greater than a size of interstices of a pore network of the fibrous texture;
• draining a liquid phase of the first suspension by the fibrous texture, evacuating said liquid phase through the one or more second ports and retaining the filtration particles by the fibrous texture so as to form a filtration layer between said fibrous texture and the one or more first ports,
• injecting a second suspension into the fibrous texture through the one or more second ports, the second suspension comprising a powder of refractory ceramic particles with a particle size smaller than the size of the interstices of the pore network of the fibrous texture,
• and draining through the filtration layer a liquid phase of the second suspension having passed through the fibrous texture and retaining refractory ceramic particle powder inside said fibrous texture by the filtration layer so as to obtain a fibrous preform comprising at least the fibrous texture filled with refractory ceramic particles and the filtration layer, the liquid phase of the second suspension being evacuated through the first ports.