Layered coating system with a MCrAlX layer and a chromium rich layer and a method to produce it
View Patent ↗A layer system and a method for producing a component having such a layer system are provided. The layer system includes a substrate a substrate, at least one MCrX layer on the substrate, and a chromium-rich layer on or in the at least one MCrX layer. X includes at least one element selected from the group consisting of yttrium (Y), silicon (Si), aluminum (Al) and boron (B). M includes at least one element selected from the group consisting of nickel (Ni) and cobalt (Co).
1. A layer system, comprising:
a substrate,
a first layer comprising two MCrX inner layers on the substrate, wherein said two MCrX inner layers comprise a second inner layer, the second inner layer being an MCrX″ layer, wherein X″ consists of Si and B,
a second layer comprising a chromized layer on the first layer, and
a third layer comprising an aluminized MCrX layer on the second layer,
wherein X is selected from the group consisting of yttrium (Y), silicon (Si), boron (B), and combinations thereof, and
wherein M is an element selected from the group consisting of nickel (Ni), cobalt (Co), and a combination thereof.
2. The layer system according to claim 1 , wherein only one of the two inner layers is directly in contact with the substrate.
3. The layer system according to claim 1 , wherein said two inner MCrX layers comprises a first inner layer, the first inner layer being an MCrAlX′ layer, wherein X′ comprises Yttrium (Y).
4. The layer system according to claim 3 , wherein the MCrAlX′ layer comprises a NiCrAlY alloy.
5. The layer system according to claim 1 , wherein the second layer on the first layer comprises an α-chromium layer.
6. The layer system according to claim 1 , wherein the chromized layer is disposed on top of the second inner layer.
7. A method for producing a component, comprising:
applying a first layer comprising two MCrX inner layers on a substrate, wherein said two MCrX inner layers comprises a second inner layer, the second inner layer being an MCrX″ layer, wherein X″ consists of Si and B,
applying a second layer comprising a chromized layer on the first layer,
applying a third layer comprising an aluminized MCrX layer on the second layer,
wherein X is selected from the group consisting of yttrium (Y), silicon (Si), boron (B), and combinations thereof, and
wherein M is selected from the group consisting of nickel (Ni), cobalt (Co), and a combination thereof.
8. The method of claim 7 , wherein the two MCrX inner layers are applied by HVOF.
9. The method according to claim 7 , wherein the second layer comprises an α-chromium layer.
10. The method according to claim 7 , further comprising after the applying of the first and second inner layers, performing a stabilizing heat treatment at 1000 to 1025° C. and for 6 h.
11. The method according to claim 7 , wherein the second layer is applied by a chromizing treatment at a temperature between 1050° C. and 1080° C. for 2 h to 4 h.