| 摘要 |
The invention relates to a method for producing an acoustic attenuation panel from a composite material with a ceramic oxide matrix, comprising the following steps: a) draping a plurality of plies in a mould, said plies consisting of fibrous reinforcements comprising fibres of a ceramic material defining a first skin (19) of the acoustic attenuation panel; b) depositing a plurality of blocks (21; 21a, 21b) of a first so-called fugitive material on the first skin, such as to define at least one space (E) between two of the blocks, the corners of the blocks (21; 21a, 21b) being rounded; c) draping a plurality of plies on the surface formed by the blocks, said plies consisting of fibrous reinforcements comprising fibres of a ceramic material, such as to define a second skin (27) of the acoustic attenuation panel; d) using the corners of the blocks (21; 21a; 21b) to define radii for connecting the first and second skins with walls of the honeycomb core of the acoustic panel; e) using a liquid medium to infiltrate the skins (19, 27) and the at least one space (E) separating the blocks of fugitive material with the precursor of the ceramic phase; f) removing the liquid medium by means of evaporation or polymerisation; g) sintering the assembly at a temperature allowing consolidation of the ceramic oxide material and removal of the fugitive material. |
