ENVIRONMENTAL BARRIER FOR A REFRACTORY SUBSTRATE CONTAINING SILICON

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A part comprising a substrate (10), at least one portion of which adjacent to a surface of the substrate is made of a refractory material containing silicon, is protected by an environmental barrier (20) formed on the surface of the substrate and having at least one self-healing layer (22) containing a rare-earth silicate. At least 90 mol% of the self-healing layer (22) is formed from a system consisting of 30 mol% to at most 80 mol% of at least one rare-earth silicate RE2Si2O7, RE being a rare earth, and at least 20 mol% to 70 mol% of manganese oxide MnO; and at most 10 mol% of the self-healing layer (22) is formed from one or more oxides, except MnO, having a eutectic point with SiO2 lower than or equal to 1595°C, the self-healing layer (22) exhibiting a liquid phase having a self-healing function in at least the entire temperature range extending from 1200°C to 1400°C while preserving a predominantly solid phase.