BRAZE COMPOSITION, BRAZING PROCESS, AND BRAZED ARTICLE

• US 20170252875A1
• Filed: 03/02/2016
• Published: 09/07/2017
• Est. Priority Date: 03/02/2016
• Status: Active Grant

• Current Assignee: GE Infrastructure Technology, LLC (GE Vernova, Inc.)
• Original Assignee: General Electric Company
• Inventors: SRINIVASAN, Dheepa, NARAYANA, Dayananda, PABLA, Surinder Singh, KOTTILINGAM, Srikanth Chandrudu
• Granted Patent: US 10,052,724 B2
• Time in Patent Office: Days
• CPC Class Codes: B23K 1/0018 Brazing of turbine parts
• CPC Class Codes: B23K 1/19 taking account of the properties of the materials to be soldered
• CPC Class Codes: B23K 2101/001 Turbines
• CPC Class Codes: B23K 2103/26 Alloys of Nickel and Cobalt and Chromium
• CPC Class Codes: B23K 35/025 Pastes, creams, slurries
• CPC Class Codes: B23K 35/304 with Cr as the next major constituent
• CPC Class Codes: B23K 35/3046 Co as the principal constituent
• CPC Class Codes: C22C 19/05 with chromium
• CPC Class Codes: C22C 19/058 without Mo and W
• CPC Class Codes: C22C 19/07 based on cobalt
• CPC Class Codes: C22C 30/00 Alloys containing less than 50% by weight of each constituent
• 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: F01D 5/005 Repairing methods or devices
• CPC Class Codes: F01D 5/20 Specially-shaped blade tips to seal space between tips and stator F01D5/225 takes precedence
• CPC Class Codes: F01D 5/288 Protective coatings for blades
• CPC Class Codes: F05D 2230/237 Brazing
• CPC Class Codes: F05D 2230/31 Layer deposition

Abstract

A braze composition, brazing process, and brazed article are disclosed. The braze composition includes a MCrAlY alloy at a concentration, by weight, of between 50% and 70%, where M is selected from the group consisting of nickel, cobalt, iron, alloys thereof, and combinations thereof, and a nickel-based alloy at a concentration, by weight, of between 30% and 50%. The brazing process includes forming a braze paste, brazing the braze paste to a portion of a component, and shaping the braze paste to form a brazed article. The brazed article includes a component and a braze composition brazed to the component, the braze composition including a MCrAlY alloy at a concentration, by weight, of between 50% and 70%, where M is selected from the group consisting of nickel, cobalt, iron, alloys thereof, and combinations thereof, and a nickel-based alloy at a concentration, by weight, of between 30% and 50%.

Claims

1. A braze composition, comprising:

a MCrAlY alloy at a concentration, by weight, of between 50% and 70%, where M is selected from the group consisting of nickel, cobalt, iron, alloys thereof, and combinations thereof; and

a nickel-based alloy at a concentration, by weight, of between 30% and 50%.

2. The braze composition of claim 1, wherein the MCrAlY alloy and the nickel-based alloy form a braze paste.

3. The braze composition of claim 1, wherein the MCrAlY alloy has a composition, by weight, of between about 30% and about 35% nickel, between about 20% and about 25% chromium, between about 8% and about 12% aluminum, between about 0.1% and about 0.5% yttrium, and a balance cobalt and incidental impurities.

4. The braze composition of claim 3, wherein the MCrAlY alloy has a composition, by weight, of 32% nickel, 21% chromium, 10% aluminum, 0.5% yttrium, and a balance cobalt and incidental impurities.

5. The braze composition of claim 1, wherein the nickel-based alloy has a composition, by weight, of between about 68% and about 74% nickel, between about 17% and about 21% chromium, and between about 8% and about 12% silicon.

6. The braze composition of claim 5, wherein the nickel-based alloy has a composition, by weight, of 71% nickel, 19% chromium, and 10% silicon.

7. The braze composition of claim 1, wherein the braze composition includes a braze temperature of between about 2175°

F. and about 2250°

F.

8. A brazing process, comprising:

forming a braze paste including;

a MCrAlY alloy at a concentration, by weight, of between 50% and 70%, where M is selected from the group consisting of nickel, cobalt, iron, alloys thereof, and combinations thereof; and

a nickel-based alloy at a concentration, by weight, of between 30% and 50%;

brazing the braze paste to a portion of a component; and

shaping the braze paste to form a brazed article.

9. The brazing process of claim 8, wherein the brazing and the shaping form a repair process.

10. The brazing process of claim 8, wherein the brazing and the shaping form a manufacture process.

11. The brazing process of claim 8, wherein the component is a gas turbine component.

12. The brazing process of claim 8, wherein the brazing is performed at a temperature of between about 2175°

F. and about 2250°

F.

13. The brazing process of claim 8, wherein a coating is present on the component during the brazing.

14. The brazing process of claim 13, wherein the coating is selected from the group consisting of a bond coating, a thermal barrier coating, and a combination thereof.

15. The brazing process of claim 8, wherein the MCrAlY alloy has a composition, by weight, of between about 30% and about 35% nickel, between about 20% and about 25% chromium, between about 8% and about 12% aluminum, between about 0.1% and about 0.5% yttrium, and a balance cobalt and incidental impurities.

16. The brazing process of claim 8, wherein the nickel-based alloy has a composition, by weight, of between about 68% and about 74% nickel, between about 17% and about 21% chromium, and between about 8% and about 12% silicon.

17. A brazed article, comprising:

a component including a service returned coating deposited thereon; and

a braze composition brazed to the component, the braze composition comprising;

a MCrAlY alloy at a concentration, by weight, of between 50% and 70%, where M is selected from the group consisting of nickel, cobalt, iron, alloys thereof, and combinations thereof; and

a nickel-based alloy at a concentration, by weight, of between 30% and 50%.

18. The brazed article of claim 17, wherein the MCrAlY alloy has a composition, by weight, of between about 30% and about 35% nickel, between about 20% and about 25% chromium, between about 8% and about 12% aluminum, between about 0.1% and about 0.5% yttrium, and a balance cobalt and incidental impurities.

19. The brazed article of claim 17, wherein the nickel-based alloy has a composition, by weight, of between about 68% and about 74% nickel, between about 17% and about 21% chromium, and between about 8% and about 12% silicon.

20. The brazed article of claim 17, wherein the component is a gas turbine component.