Coating, coating layer system, coated superalloy component
View Patent ↗Coatings as may be used in a gas turbine are provided. A cobalt based coating may include 15 to 40 wt % nickel, 15 to 28 wt % chromium, 5 to 15 wt % aluminum, 0.05 to 1 wt % yttrium and/or at least one of elements from lanthanum series, 0.05 to 5 wt % ruthenium and/or molybdenum, 0 to 2 wt % iridium, 0 to 3 wt % silicon, 0 to 5 wt % tantalum, hafnium, unavoidable impurities, and a balance of cobalt. A nickel based coating may include 15 to 40 wt % cobalt, 10 to 25 wt % chromium, 5 to 15 wt % aluminum, 0.05 to 1 wt % yttrium and/or at least one of elements from lanthanum series, 0.05 to 8 wt % ruthenium or iron, 0 to 1 wt % iridium, 0.05 to 5 wt % molybdenum, 0 to 3 wt % silicon, 0 to 5 wt % tantalum, 0 to 2 wt % hafnium, unavoidable impurities, and a balance of nickel.
1. A cobalt based coating consisting of:
15 to 40
weight percent of
nickel,
15 to 28
weight percent of
chromium,
5 to 15
weight percent of
aluminum,
0.05 to 1
combined weight
yttrium and/or at least one
percent of
element from lanthanum series,
0.05 to 8
combined weight
ruthenium and molybdenum
percent of
wherein both ruthenium and
molybdenum are present,
0 to 2
weight percent of
iridium,
0 to 3
weight percent of
silicon,
0 to 5
weight percent of
tantalum,
0 to 2
weight percent of
hafnium,
all percentages relative to a total weight of the coating, unavoidable
impurities, and a balance of cobalt.
2. The coating according to claim 1 , containing 0.1 to 0.6 weight percent of silicon.
3. The coating according to claim 1 , containing 0.3 to 0.7 weight percent of tantalum.
4. The coating according to claim 1 , containing 0.1 to 0.5 weight percent of hafnium.
5. The coating according to claim 1 , wherein a content of sulfur is reduced to below 10 ppm (parts per million) by weight.
6. The coating according to claim 1 , wherein a thickness of the coating is between 30 and 800 μm.
7. A coating layer system comprising a lower first layer on a substrate and an adherent upper second layer, wherein the lower first layer is a coating according to claim 1 and the adherent upper second layer is a ceramic coating or multiple ceramic coatings.
8. The coating layer system according to claim 7 , wherein each of the ceramic coatings includes
zirconium dioxide
and a stabilizer.
9. The coating layer system according to claim 8 , wherein the stabilizer is at least one of yttrium oxide, magnesium oxide, and oxides of elements in lanthanum series.
10. A coated superalloy component comprising
a substrate article formed of a superalloy and
an adherent coating according to claim 1 .
11. The coated superalloy component according to claim 10 , wherein the superalloy component is a blade, a vane, or a sealing segment of a gas turbine's hot gas path.
12. A coated superalloy component comprising:
a substrate article formed of a superalloy;
a lower first layer on the substrate; and
an adherent upper second layer on the lower first layer,
wherein:
the lower first layer is a coating according to claim 1
the adherent second layer is a ceramic coating or multiple ceramic coatings; and
each of the ceramic coatings include zirconium dioxide and a stabilizer.
13. The coating of claim 1 , comprising greater than 0 weight percent and less than or equal to 2 weight percent of the iridium.
14. The coating of claim 1 , wherein the 0.05 to 1 combined weight percent of yttrium and/or at least one element from lanthanum series comprises 0.05 to 1 weight percent of the at least one element from the lanthanum series.
15. A cobalt based coating consisting of
15 to 40 weight percent of nickel,
15 to 28 weight percent of chromium,
5 to 15 weight percent of aluminum,
0.05 to 1 combined weight percent of yttrium and/or at least one element from the lanthanum series,
0.05 to 8 weight percent of molybdenum,
greater than 0 and less than or equal to 2 weight percent of iridium,
0 to 3 weight percent of silicon,
0 to 5 weight percent of tantalum,
0 to 2 weight percent of hafnium,
unavoidable impurities, and
the balance of the cobalt.
16. The coating of claim 15 , wherein the 0.05 to 1 combined weight percent of yttrium and/or at least one element from the lanthanum series comprises 0.05 to 1 weight percent of the at least one element from the lanthanum series.
17. A cobalt based coating consisting of:
15 to 40 weight percent of nickel,
15 to 28 weight percent of chromium,
5 to 15 weight percent of aluminum,
0.05 to 1 combined weight percent of yttrium and/or at least one element from the lanthanum series,
0.05 to 8 combined weight percent of at least molybdenum and optionally ruthenium,
greater than 0 and less than or equal to 2 weight percent of iridium,
0 to 3 weight percent of silicon,
0 to 5 weight percent of tantalum,
0 to 2 weight percent of hafnium,
all percentages relative to a total weight of the coating, and
a balance of cobalt.