The invention relates to a part (10) comprising: - a substrate (20) of which at least a part adjacent to a surface (S) of the substrate is made of a material comprising silicon; - a bonding sub-layer (30) located on the surface (S) of the substrate and comprising silicon, - an environmental barrier (40) which comprises an outer ceramic layer (42) covering the bonding sub-layer (30), characterized in that said environmental barrier (40) further comprises a self-healing inner layer (41) located between the bonding sub-layer (30) and the outer layer (42), said inner layer ( 41) comprising a matrix in which silico-forming particles are dispersed, these particles being able to generate a phase for healing cracks in the matrix in the presence of oxygen.
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