Nova Patents
EP1361291A2

Oxidation and fatigue resistant metallic coating

Abstract

The present invention relates to a metallic coating to be deposited on gas turbine engine components. The metallic coating comprises up to 18 wt% cobalt, 3.0 to 18 wt% chromium, 5.0 to 15 wt% aluminum, 0.1 to 1.0 wt% yttrium, up to 0.6 wt% hafnium, up to 0.3 wt% silicon, 3.0 to 10 wt% tantalum, up to 9.0 wt% tungsten, 1.0 to 6.0 wt% rhenium, up to 10 wt% molybdenum, and the balance nickel.

Term

Term ended

Projected expiry passed 7 May 2023, 3.4 years ago.

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33 claims: 14 independent, 19 dependent

  1. 1
    A metallic coating for providing oxidation and fatigue resistance having a composition comprising up to 18 wt% cobalt, 3.0 to 18 wt% chromium, 5.0 to 15 wt% aluminum, 0.1 to 1.0 wt% yttrium, up to 0.6 wt% hafnium, up to 0.3 wt% silicon, 3.0 to 10 wt% tantalum, up to 9.0 wt% tungsten, 1.0 to 6.0 wt % rhenium, up to 10 wt% molybdenum, and the balance nickel.
  2. 5
    A metallic coating according to any of claims 2 to 4, wherein a total amount of said tantalum and said tungsten is in a range from 4.0 to 16 wt%.
  3. 6
    A metallic coating having a composition consisting essentially of up to 15 wt% cobalt, 5.0 to 18 wt% chromium, 5.0 to 12 wt% aluminum, 0.1 to 1.0 wt% yttrium, up to 0.06 hafnium, up to 0.3 wt% silicon, 3.0 to 10 wt% tantalum, up to 5.0 wt% tungsten, 1.0 to 6.0 wt% rhenium, up to 10 wt% molybdenum, and the balance nickel.
  4. 9
    A metallic coating according to any of claims 6 to 8, wherein said cobalt is present in an amount less than 2.0 wt%, said chromium is present in an amount from 10 to 15 wt%, said aluminum is present in an amount from 6.0 to 10 wt%, said yttrium is present in an amount from 0.2 to 0.7 wt%, said hafnium is present in an amount from 0.2 to 0.6 wt%, said silicon is present in an amount no greater than 0.1 wt%, and said tantalum is present in an amount from 5.0 to 7.0 wt%.
  5. 12
    A metallic coating according to any of claims 6 to 11, wherein said rhenium is present in an amount from 1.0 to 3.5 wt%, preferably in an amount of 2.0 wt%.
  6. 13
    A metallic coating according to any of claims 6 to 12, wherein said molybdenum is present in an amount no greater than 4.0 wt%.
  7. 14
    A metallic coating consisting essentially of up to 2.0 wt% cobalt, 10 to 15 wt% chromium, 6.0 to 10 wt% aluminum, 0.2 to 0.7 wt% yttrium, 0.2 to 0.6 hafnium, 0.001 to 0.1 wt% silicon, 5.0 to 7.0 wt% tantalum, 1.0 to 4.0 wt% tungsten, 1.0 to 3.5 wt% rhenium, up to 4.0% molybdenum, and the balance nickel.
  8. 16
    A metallic coating consisting of 12.5 wt% chromium, 8.0 wt% aluminum, 0.4 to 0.7 wt% yttrium, 0.4 wt% hafnium, 6.0 wt% tantalum, 2.0 wt% tungsten, 2.0 wt% rhenium, and the balance nickel.
  9. 17
    A metallic coating consisting essentially of 2.0 to 18 wt% cobalt, 3.0 to 10 wt% chromium, 5.5 to 15 wt% aluminum, 0.1 to 1.0 wt% yttrium, up to 0.6 wt% hafnium, up to 0.3 wt% silicon, 3.0 to 10 wt% tantalum, 1.0 to 9.0 wt% tungsten, 1.0 to 5.0 wt% rhenium, 0.2 to 4.0 wt% molybdenum, and the balance nickel.
  10. 21
    A metallic coating according to any of claims 17 to 20, wherein said cobalt is present in an amount from 8.0 to 12 wt%, said chromium is present in an amount from 4.0 to 6.5 wt%, said aluminum is present in an amount from 7.5 to 12.5 wt%, said yttrium is present in an amount from 0.2 to 0.7 wt%, said hafnium is present in an amount from 0.2 to 0.6 wt%, said silicon is present in an amount no greater than 0.1 wt%, and said tantalum is present in an amount from 5.0 to 7.0 wt%.
  11. 23
    A metallic coating according to any of claims 17 to 20, wherein said tungsten is present in an amount from 4.2 to 5.8 wt%, said rhenium is present in an amount from 2.3 to 3.7 wt%, and said molybdenum is present in an amount from 1.4 to 2.0 wt%.
  12. 25
    A metallic coating having a composition consisting essentially of 8.0 to 12 wt% cobalt, 4.0 to 6.5 wt% chromium, 7.5 to 12.5 wt% aluminum, 0.2 to 0.7 wt% yttrium, 0.2 to 0.6 wt% hafnium, up to 0.3 wt% silicon, 5.0 to 7.0 wt% tantalum, 4.2 to 5.8 wt% tungsten, 2.3 to 3.7 wt% rhenium, 1.4 to 2.0 wt% molybdenum, and the balance nickel.
  13. 27
    A metallic coating consisting of 10.5 wt% cobalt, 5.0 wt% chromium, 9.0 wt% aluminum, 0.4 to 0.7 wt% yttrium, 0.4 wt% hafnium, 0.1 wt% silicon, 6.0 wt% tantalum, 5.0 wt% tungsten, 3.0 wt% rhenium, 1.7 wt% molybdenum, and the balance nickel.
  14. 28
    A method for depositing an overlay coating on a substrate comprising:providing a substrate material formed from at least one of a nickel-based, a cobalt-based, and an iron-based metallic material;anddepositing onto said substrate a coating having a composition consisting essentially of up to 18 wt% cobalt, 3.0 to 18 wt% chromium, 5.0 to 15 wt% aluminum, 0.1 to 1.0 wt% yttrium, up to 0.6 wt% hafnium, up to 0.3 wt% silicon, 3.0 to 10 wt% tantalum, up to 9.0 wt% tungsten, 1.0 to 6.0 wt% rhenium, up to 10 wt% molybdenum, and the balance nickel.
Independent claims14