FIELD: machine building.
SUBSTANCE: component of turbine consists of root, neck, platform and aerodynamic profile with external and internal surfaces defining cooling pass channels. According to one version the root of turbine component has one first coating, while the neck has the second coating. Also, composition of the first coating differs from the composition of the second coating. According to another version internal surface is covered with the first coating, while external surface is covered with the second coating; the first and second coating have different compositions. The third coating different from the first and the second one covers the platform and/or a lower side of the platform. The neck is covered with the fourth coating different from the third coating; the root is covered with the fifth coating different from the fourth coating. According to another one version the neck is covered with the first coating, a bottom of the platform is covered with the second coating; also, the first and the second coating are of different compositions. Internal surface is covered with the fourth coating, while the root is covered with the fifth coating corresponding in particular to a diffusion aluminide, aluminised layer, chromised layer or aluminised and chromised layer, also, the fifth coating differs from the fourth coating. Another invention of the group refers to a turbine containing the first step of working and guiding blades and the second step of working and guiding blades where the working blades of the first and second steps correspond to above said turbine components. Another invention of the group refers to procedure for coating the turbine component consisting in applying the first coating on all external and internal surfaces of the component, in applying the second coating on the first part of the coated component, and in applying the third coating on the second part of the coated component; also, the first, second and third coatings have different compositions.
EFFECT: increased reliability of turbine component.
90 cl, 15 dwg
