ACOUSTICAL ATTENUATION PANEL IN CERAMIC OXIDE COMPOSITE MATERIAL WITH ELECTROCHIMICALLY CONVERTED METALLIC MATERIAL

摘要

A method of manufacturing an acoustic attenuation panel comprising two outer skins (4, 6) made of a ceramic matrix composite material containing fibrous reinforcement, assembled on each side of a central honeycomb core (2) having walls (10) forming acoustic cavities made by at least partial electrochemical conversion of aluminum to aluminum oxide, this method comprising a step of insertion in acoustic cavities of a fugitive filling material leaving free in each cavity, on each side against the skin, an annular space around this cavity, and a sintering step of the composite material achieving an elimination of the fugitive material, with a filling by the composite material spaces around the cavities.