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US 2015/0030876 A1Published application
Coating system with nicocraly double protective coating having differing chromium content and alloy
AssigneeSiemens Aktiengesellschaft
InventorWerner Stamm
Life of this patent
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Abstract
By using a two-layer NiCoCraly coating, the formation of cracks in a thermally grown oxide coating, such as is formed on the basis of the protective effect of the NiCoCraly coating, can be reduced.
Claims22
A layer system, which comprises:
- a substrate;
- a two-layered NiCoCrAlY layer on the substrate and comprising:
- a bottom NiCoCrAlY layer toward the substrate and an outer NiCoCrAlY layer on the bottom layer;
- a chromium (Cr) content of the bottom NiCoCrAlY layer is lower, than a chromium (Cr) content of the outer NiCoCrAlY layer;
- and
- a cobalt (Co) content of the bottom NiCoCrAlY layer is the same as or approximately the same as cobalt (Co) content of the outer NiCoCrAlY layer.
3 more elements
(canceled)
An alloy,
- which consist of (in % by weight):
- cobalt (Co):
- 22%-26%,
- chromium (Cr):
- 23%-25%,
- aluminum (Al):
- 10.5%-12.0%,
- yttrium (Y):
- 0.2%-0.6%, and
- nickel.
7 more elements
The layer system as claimed in claim 21, wherein the powder for the top layer is coarser, such that a roughness of the top layer of Ra=9 μm to 14 μm is achieved.
An alloy which consists by weight of:
- cobalt (Co),
- chromium (Cr) 23%-25%,
- aluminum (Al) 24%,
- yttrium (Y) 0.3%-0.5%, and
- nickel.
2 more elements
Dependencies are inferred from the claim text.