COMPOSITE MATERIAL COMPONENT WITH SILICON-CONTAINING CERAMIC MATRIX, PROTECTED AGAINST CORROSION

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The invention concerns an environmental barrier formed on a substrate (10) made of composite material with ceramic matrix and comprising an outer anti-corrosion protective layer (12) containing a compound of the alkaline, alkaline-earth or rare earth aluminosilicate. Between the substrate (10) and the protective layer (12) an adhesion sublayer (14) is formed, the composition of which develops from substantially pure silicon into substantially pure mullite between an inner surface on the substrate side, and an outer surface, decreasing in silicon content and increasing in mullite content.