US5401307A — High temperature-resistant corrosion protection c…

Claim 1

Independent Claim 132 words

A protective coating resistant to corrosion applied on a component formed of a nickel-based or cobalt-based superalloy, the protective coating consisting essentially of the following elements (in percent by weight): 25 to 40% nickel, 28 to 32% chromium, 7 to 9% aluminum, 1 to 2% silicon, 0.3 to 1% of at least one reactive element of the rare earths, selectively from 0 to 15% of at least one of the elements of the group consisting of rhenium, platinum, palladium, zirconium, manganese, tungsten, titanium, molybdenum, niobium, iron, hafnium, and tantalum, the total share of the elements of the group being from 0 to a maximum of 15%, impurities, and a remainder of at least 5% cobalt; and the component and the coating applied thereon having a ductile brittle transition temperature below 600° C.

Claim 2

Dependent Claim 132 words

A protective coating resistant to corrosion applied on a component formed of a nickel-based or cobalt-based superalloy, the protective coating consisting essentially of the following elements (in percent by weight): 25 to 40% nickel, 28 to 32% chromium, 7 to 9% aluminum, 1 to 2% silicon, 0.3 to 1% of at least one reactive element of the rare earths, selectively from 0 to 15% of at least one of the elements of the group consisting of rhenium, platinum, palladium, zirconium, manganese, tungsten, titanium, molybdenum, niobium, iron, hafnium, and tantalum, the total share of the elements of the group being from 0 to a maximum of 15%, impurities, and a remainder of at least 5% cobalt; and the component and the coating applied thereon having a ductile brittle transition temperature below 600° C.

Claim 3

Dependent Claim 46 words

The protective coating applied on the component according to claim 1, wherein the nickel is 25 to 35% by weight, the chromium is 29 to 31% by weight, the aluminum is 7.5 to 8.5% by weight, and the reactive element of the rare earths is yttrium.

Claim 4

Dependent Claim 48 words

The protective coating applied on the component according to claim 2, wherein the nickel is approximately 30% by weight, the chromium is approximately 30% by weight, the aluminum is approximate 8% by weight, the silicon is approximately 1.5% by weight and the yttrium is approximately 0.6% by weight.

Claim 5

Dependent Claim 68 words

A protective coating applied on a component formed of a nickel-based or cobalt-based superalloy, the protective coating comprising in percent by weight: 25 to 40% nickel, 28 to 32% chromium, 7 to 9% aluminum, 1 to 2% silicon, 0.3 to 1% of at least one reactive element of the rare earths, an addition of from 1 to 15% rhenium, impurities, and a remainder of at least 5% cobalt.

Claim 6

Dependent Claim 68 words

A protective coating applied on a component formed of a nickel-based or cobalt-based superalloy, the protective coating comprising in percent by weight: 25 to 40% nickel, 28 to 32% chromium, 7 to 9% aluminum, 1 to 2% silicon, 0.3 to 1% of at least one reactive element of the rare earths, an addition of from 1 to 15% rhenium, impurities, and a remainder of at least 5% cobalt.

Claim 7

Dependent Claim 27 words

The protective coating applied on the component according to claim 4, wherein the protective coating and the component have a ductile brittle transition temperature below 600° C.

Claim 8

Dependent Claim 27 words

The protective coating applied on the component according to claim 1, wherein the protective coating and the component have a ductile brittle transition temperature below 500° C.

Claim 9

Dependent Claim 21 words

The protective coating applied to a component according to claim 4, wherein the addition of rhenium is approximately 7% by weight.

Claim 10

Dependent Claim 23 words

The protective coating applied to a component according to claim 1, wherein the ductile brittle transition temperature is lower than approximately 450° C.

Claim 11

Dependent Claim 23 words

The protective coating applied to a component according to claim 1, wherein the ductile brittle transition temperature is lower than approximately 400° C.

Claim 12

Dependent Claim 69 words

The protective coating applied to a component according to claim 1, wherein the component is a nickel-based superalloy consisting essentially of the following elements (in percent by weight): 0.08 to 0.1% carbon, 12 to 16% chromium, 8 to 10% cobalt, 1.5 to 2% molybdenum, 2.5 to 4% tungsten, 1.5 to 4.5% tantalum, 0 to 1% titanium, 0 to 0.1% zirconium, 0 to 1% hafnium, and a balance of nickel.

Claim 13

Dependent Claim 74 words

The protective coating applied to a component according to claim 1, wherein the component is a nickel-based superalloy consisting essentially of the following elements (in percent by weight): 0.08 to 0.1% carbon, 12 to 16% chromium, 8 to 10% cobalt, 1.5 to 2% molybdenum, 2.5 to 4% tungsten, 1.5 to 4.5% tantalum, 0 to 1% titanium, 0 to 0.1% zirconium, 0 to 1% hafnium, a minor addition of boron, and a balance of nickel.

Claim 14

Dependent Claim 24 words

The protective coating applied to a component according to claim 1, wherein said coating has a thickness of between 200 μm and 300 μm.

Claim 15

Dependent Claim 28 words

The protective coating applied to the component according to claim 10, wherein in the coating the chromium is approximately 30% and the rare earth is approximately 0.6% yttrium.

Claim 16

Dependent Claim 43 words

The protective coating applied to the component according to claim 10, wherein in the coating the elements of the group consisting of rhenium, platinum, palladium, zirconium, manganese, tungsten, titanium, molybdenum, niobium, iron, hafnium, and tantalum are admixed in a range less than 15%.

Claim 17

Dependent Claim 84 words

A protective coating composition resistant to corrosion consisting essentially of the following elements (in percent by weight): approximately 30% nickel, approximately 29 to 31% chromium, approximately 8% aluminum, approximately 1.5% silicon, 0.3 to 1% of at least one reactive element of the rare earths, selectively from 0 to 15% of at least one of the elements selected from the group consisting of rhenium, platinum, palladium, zirconium, manganese, tungsten, titanium, molybdenum, niobium, iron, hafnium, and tantalum, impurities, and a remainder of at least 5% cobalt.

Claim 18

Dependent Claim 84 words

A protective coating composition resistant to corrosion consisting essentially of the following elements (in percent by weight): approximately 30% nickel, approximately 29 to 31% chromium, approximately 8% aluminum, approximately 1.5% silicon, 0.3 to 1% of at least one reactive element of the rare earths, selectively from 0 to 15% of at least one of the elements selected from the group consisting of rhenium, platinum, palladium, zirconium, manganese, tungsten, titanium, molybdenum, niobium, iron, hafnium, and tantalum, impurities, and a remainder of at least 5% cobalt.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1998-03-27	1998-09-26	1999-03-28	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2002-03-27	2002-09-26	2003-03-28	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2006-03-27	2006-09-26	2007-03-28	$7700.00	Window Closed / Lapsed

High temperature-resistant corrosion protection coating on a component, in particular a gas turbine component

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