FIELD: material processing.
SUBSTANCE: present invention relates to a part containing substrate with at least one section made of silicon-containing material adjacent to the surface of substrate, and an external barrier formed on the surface of substrate and containing the first layer containing at least one silicate of a rare earth element in the amount of at least 50 mol.% with an average grain size of 1 mcm or less; and the second layer covering the first layer and containing at least one second silicate of a rare earth element in the amount of at least 50 mol.% and having an average grain size greater than 1 mcm. As part of the first layer, ytterbium disilicate and yttrium disilicate are used, and as part of the second layer, disilicates or mono-silicates of rare earth elements are used.
EFFECT: technical result of the invention is an increase in the service life of the part in wet and oxidizing environment at high temperature.
10 cl, 2 ex, 7 dwg
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