Method for manufacturing a part made of composite material with compliance control

Manufacturing method for a fibrous preform of a composite material part, the preform being obtained by:

• forming a fibrous texture from refractory ceramic fibres,
• shaping the fibrous texture in a mould cavity present in an injection tool,
• injecting a slurry containing a refractory ceramic particle powder into the fibrous texture present in the mould cavity,
• draining the liquid from the slurry that passed through the fibrous texture and retaining the refractory ceramic particle powder inside said texture so as to obtain a fibrous preform loaded with refractory ceramic particles,
• first demoulding of the fibrous preform,
• wherein the method also comprises, after the first demoulding of the fibrous preform, the following steps:
• immersing the demoulded fibrous preform in a bath of a liquid suitable for decompacting the refractory ceramic particles present in the fibrous preform,
• shaping the wet fibrous preform in a mould cavity present in an injection tool,
• eliminating the liquid present in the fibrous preform,
• additionally injecting a slurry containing a refractory ceramic particle powder into the fibrous preform present in the mould cavity,
• draining the liquid from the slurry that passed through the fibrous preform and retaining the refractory ceramic particle powder inside said texture so as to obtain a fibrous preform loaded with refractory ceramic particles,
• second demoulding of the fibrous preform.