Coating, coating layer system, coated superalloy component
View Patent ↗Coatings as may be used in a gas turbine are provided. 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. 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.
1. A nickel based coating consisting of:
15 to 40
weight percent of
cobalt,
10 to 23
weight percent of
chromium,
5 to 15
weight percent of
aluminum,
0.05 to 1
combined weight
yttrium and/or at least one of
percent of
elements from lanthanum series,
0.05 to 5
weight percent of
ruthenium,
0 to 2
weight percent of
iridium,
0.05 to 5
weight percent of
molybdenum,
0 to 3
weight percent of
silicon,
0 to 20
weight percent of
iron
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 unavoidable impurities,
and a balance of nickel.
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. A coating layer according to claim 1 , wherein a content of sulfur is reduced to below 10 ppm (parts per million) by weight.
6. A coating layer according to claim 1 , wherein the thickness of the coating is in a range of 30 to 800 μm.
7. A coating layer system comprising a lower first layer on a substrate and an adherent upper second layer, wherein the first layer is a coating according to claim 1 and the second layer is a ceramic coating or multiple ceramic coatings.
8. The coating layer system according to claim 7 , wherein each of ceramic coatings includes
zirconium dioxide
and a stabilizer.
9. A coated superalloy component comprising:
an adherent coating layer system according to claim 8 .
10. The coating layer system according to claim 7 , wherein the stabilizer is at least one of yttrium oxide, magnesium oxide, and oxides of elements in lanthanum series.
11. A coated superalloy component comprising:
a substrate article formed of a superalloy and
an adherent coating according to claim 1 .
12. The coated superalloy component according to claim 11 , wherein the superalloy component is a blade, a vane, or a sealing segment of a gas turbine's hot gas path.