METALLIC COATING FOR SINGLE CRYSTAL ALLOYS

• US 20110256421A1
• Filed: 04/16/2010
• Published: 10/20/2011
• Est. Priority Date: 04/16/2010
• Status: Abandoned Application

• Current Assignee: United Technologies Corporation (Rtx Corporation)
• Original Assignee: United Technologies Corporation (Rtx Corporation)
• Inventors: Woodard, Shiela, Bose, Sudhangshu, Seetharaman, Venkatarama K., Litton, David A., Maloney, Michael J., Cetel, Alan D.
• Application Number:
  US12/761,667
• Publication Number:
  US 20110256421A1
• Time in Patent Office: Days
• US Class Current: 428/680
• CPC Class Codes: B32B 15/01 all layers being exclusively metallic making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00
• CPC Class Codes: C22C 19/056 with the maximum Cr content being at least 10% but less than 20%
• CPC Class Codes: C22C 19/057 with the maximum Cr content being less 10%
• CPC Class Codes: C23C 28/00 Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
• CPC Class Codes: C23C 30/00 Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process C23C26/00, C23C28/00 take precedence
• CPC Class Codes: C23C 4/08 containing only metal elements C23C4/073 takes precedence
• CPC Class Codes: C30B 29/52 Alloys
• CPC Class Codes: Y10T 428/12944 Ni-base component

Abstract

A metallic coating for use in a high temperature application is created from a nickel base alloy containing from 5.0 to 10.5 wt % aluminum, from 4.0 to 15 wt % chromium, from 2.0 to 8.0 wt % tungsten, from 3.0 to 10 wt % tantalum, and the balance nickel. The metallic coating has particular utility in protecting single crystal superalloys used in high temperature applications such as turbine engine components.

Claims

1. A metallic coating for use in a high temperature application comprises a nickel base alloy containing from 5.0 to 10.5 wt % aluminum, from 4.0 to 15 wt % chromium, from 2.0 to 8.0 wt % tungsten, from 3.0 to 10 wt % tantalum and the balance nickel.

2. The metallic coating according to claim 1, wherein said coating is a bondcoat.

3. The metallic coating according to claim 1, wherein said coating is a standalone coating providing oxidation and/or corrosion resistance.

4. The metallic coating according to claim 1, wherein said nickel base alloy further contains at least one additional constituent selected from the group consisting of up to 5.0 wt % rhenium, up to 0.4 wt % molybdenum, from 0.1 to 0.5 wt % hafnium, and from 0.05 to 0.5 wt % yttrium.

5. The metallic coating according to claim 1, wherein said nickel base alloy further contains up to 5.0 wt % rhenium, up to 0.4 wt % molybdenum, from 0.1 to 0.5 wt % hafnium, and from 0.05 to 0.5 wt % yttrium.

6. The metallic coating according to claim 1, wherein said nickel base alloy further contains from 14 to 21 wt % cobalt.

7. The bondcoat according to claim 6, wherein said nickel base alloy further contains from 1.0 to 5.0 wt % ruthenium.

8. The bondcoat according to claim 1, wherein said nickel base alloy further contains from 1.0 to 5.0 wt % ruthenium.

9. The bondcoat according to claim 1, wherein said nickel based alloy contains from 4.5 to 5.5 wt % chromium, from 9.0 to 11 wt % cobalt;

from 1.5 to 2.5 wt % molybdenum, from 5.0 to 6.5 wt % tungsten, from 2.5 to 3.5 wt % rhenium, from 7.0 to 9.5 wt % tantalum, and from 0.1 to 0.5 wt % hafnium.

10. An article for use in a high temperature application comprises a substrate formed from a single crystal alloy containing at least one of from 2.0 to 6.0 wt % rhenium and from 2.0 to 6.0 wt % ruthenium and a metallic coating deposited on said substrate, which metallic coating comprises a nickel base alloy containing from 5.0 to 10.5 wt % aluminum, from 4.0 to 15 wt % chromium, from 2.0 to 8.0 wt % tungsten, from 3.0 to 10 wt % tantalum, and the balance nickel.

11. The article according to claim 10, wherein said nickel base alloy further contains at least one additional constituent selected from the group consisting of up to 5.0 wt % rhenium, up to 0.4 wt % molybdenum, from 0.1 to 0.5 wt % hafnium, and from 0.05 to 0.5 wt % yttrium.

12. The article according to claim 10, wherein said nickel base alloy further contains up to 5.0 wt % rhenium, up to 0.4 wt % molybdenum, from 0.1 to 0.5 wt % hafnium, and from 0.05 to 0.5 wt % yttrium.

13. The article according to claim 10, wherein said nickel base alloy further contains from 14 to 21 wt % cobalt.

14. The article according to claim 13, wherein said nickel base alloy further contains from 1.0 to 5.0 wt % ruthenium.

15. The article according to claim 10, wherein said nickel base alloy further contains from 1.0 to 5.0 wt % ruthenium.

16. The article according to claim 10, wherein said nickel based alloy contains from 4.5 to 5.5 wt % chromium, from 9.0 to 11 wt % cobalt;

from 1.5 to 2.5 wt % molybdenum, from 5.0 to 6.5 wt % tungsten, from 2.5 to 3.5 wt % rhenium, from 7.0 to 9.5 wt % tantalum, and from 0.1 to 0.5 wt % hafnium.

17. The article according to claim 10, wherein said substrate is formed from a single crystal nickel based alloy.

18. The article according to claim 17, wherein said single crystal nickel based alloy contains from 4.5 to 5.5 wt % chromium, from 9.0 to 11 wt % cobalt;

from 1.5 to 2.5 wt % molybdenum, from 5.0 to 6.5 wt % tungsten, from 2.5 to 3.5 wt % rhenium, from 7.0 to 9.5 wt % tantalum, and from 0.1 to 0.5 wt % hafnium.

19. A process for forming an article for use in a high temperature application comprises providing a substrate formed from a single crystal alloy containing at least one of from 2.0 to 6.0 wt % rhenium and from 2.0 to 6.0 wt % ruthenium and depositing a metallic coating on a surface said substrate, said metallic coating depositing step comprising depositing comprises a nickel base alloy containing from 5.0 to 10.5 wt % aluminum, from 4.0 to 15 wt % chromium, from 2.0 to 8.0 wt % tungsten, from 3.0 to 10 wt % tantalum, and the balance nickel.