SYSTEM OF LAYERS WITH DOUBLE METAL MCrAlY-COATING Russian patent published in 2016 - IPC C23C28/02 C23C14/06 

FIELD: chemistry; technological processes.

SUBSTANCE: invention relates to protective coating for protection of a part against corrosion and/or oxidation, in particular, at high temperatures. Corrosion-resistant coating applied onto substrate (4) made of a heat-resistant alloy based on nickel or cobalt in the form of a system of layers containing at least upper layer (10) deposited on lower layer (7). Said lower layer (7) contains MCrAl-nickel-based alloy, which is free from tantalum (Ta), silicon (Si), iron (Fe) and rhenium (Re). Upper layer (10) contains MCrAl-nickel-based alloy containing, MP: at least 1 of cobalt (Co), at least 1 of chromium (Cr), at least 1 of aluminium (Al), with tantalum (Ta) and/or iron (Fe), wherein content of tantalum (Ta) ranges from 0.5 MP to 1.5 MP. For alloys of upper layer (10) and bottom layer (7) the following is correct: they are free from zirconium (Zr), and/or they are free from titanium (Ti), and/or they are free from gallium (Ga), and/or they are free from germanium (Ge).

EFFECT: protective coating is provided, which has good resistance to high-temperature corrosion and oxidation, exhibits a good long-term stability and is well adapted to mechanical loads at high temperatures, in particular, in a gas turbine.

35 cl, 5 dwg