Method for producing a part made of composite material

A method for producing a part made of composite material, comprising:

• obtaining a mold comprising (i) a fibrous texture, (ii) a granular filtration layer located between a drainage surface of the fibrous texture and a permeable discharge element and comprising a powder of filtration particles, and (iii) a retention element for retaining the granular filtration layer, which retention element is distinct from said granular filtration layer and located between the permeable discharge element and the drainage surface,
• introducing a suspension comprising matrix particles in a liquid medium through an introduction surface of the fibrous texture that is distinct from the drainage surface, the liquid medium passing through the drainage surface, the granular filtration layer and the retention element to be discharged through the permeable discharge element, and the matrix particles being retained in the pores of the fibrous texture by the granular filtration layer, and
• after discharging the liquid medium, forming the part made of composite material by forming a matrix in the pores of the fibrous texture loaded with the thus introduced matrix particles, the matrix being formed from the matrix particles and forming a surface layer of this part from the filtration particles,
• wherein obtaining the mold comprises positioning the granular filtration layer in the form of a block comprising the filtration particles bound together by a fugitive binder.