Method of repairing turbine component

Patent metadata

Field	Value
Publication number	US-2018236558-A1
Application number	US-201715439592-A
Country	US
Kind code	A1
Filing date	Feb 22, 2017
Priority date	Feb 22, 2017
Publication date	Aug 23, 2018
Grant date	—

Abstract

Methods of manufacturing or repairing a turbine blade or vane are described. The airfoil portions of these turbine components are typically manufactured by casting in a ceramic mold, and a surface made up of the cast airfoil and at the least the ceramic core serves as a build surface for a subsequent process of additively manufacturing the tip portions. The build surface is created by removing a top portion of the airfoil and the core, or by placing an ultra-thin shim on top of the airfoil and the core. The overhang projected by the shim is subsequently removed. These methods are not limited to turbine engine applications, but can be applied to any metallic object that can benefit from casting and additive manufacturing processes. The present disclosure also relates to finished and intermediate products prepared by these methods.

First claim

1 . A method of manufacturing a metal object, comprising:
(a) introducing a ceramic slurry into a cavity within a cast component to form a ceramic support upon solidification of the ceramic slurry; (b) removing a portion of the cast component and the ceramic support to create a surface portion of the cast component and a surface portion of the ceramic support; (c) depositing a layer of metallic powder onto the surface portions; (d) irradiating at least a portion of the metallic powder to form a fused layer; and (e) repeating steps (c)-(d) until the metal object is formed.

2 . The method according to claim 1 , wherein the surface portions are planar surfaces.

3 . The method according to claim 1 , wherein the method is a process of repairing the metal object.

4 . The method according to claim 1 , further comprising pouring a ceramic slurry around the cast component to form a ceramic shell upon solidification of the ceramic slurry.

5 . The method according to claim 1 , further comprising treating the surface portions to prevent ceramic contamination.

6 . The method according to claim 5 , wherein the surface portions are treated by vacuuming, chemical treatment with an alkaline media, with a protective layer, or a combination thereof.

7 . The method according to claim 1 , wherein steps (c)-(e) are carried out in the presence of induction heating, radiant heating or a combination of both.

8 . The method according to claim 1 , further comprising removing the ceramic support from the metal object.

9 . The method according to claim 8 , wherein the metal object is a turbine blade, and the cast component is an airfoil.

10 . The method according to claim 8 , wherein the metal object is a stator vane, and the cast component is an airfoil.

11 . A method of manufacturing a turbine blade or vane, comprising:
(a) introducing a ceramic slurry into a cavity within a cast component to form a ceramic support upon solidification of the ceramic slurry; (b) removing a portion of the cast component and the ceramic support to create a surface portion of the cast component and a surface portion of the ceramic support; (c) depositing a layer of metallic powder onto the surface portions; (d) irradiating at least a portion of the metallic powder to form a fused layer; and (e) repeating steps (c)-(d) until the blade or vane is formed.

12 . The method according to claim 11 , wherein the surface portions are planar surfaces.

13 . The method according to claim 11 , wherein the method is a process of repairing the blade or vane.

14 . The method according to claim 11 , further comprising pouring a ceramic slurry around the cast component to form a ceramic shell upon solidification of the ceramic slurry.

15 . The method according to claim 11 , further comprising treating the surface to prevent ceramic contamination.

16 . The method according to claim 15 , wherein the surface portions are treated by vacuuming, chemical treatment with an alkaline media, with a protective layer, or a combination thereof.

17 . The method according to claim 11 , wherein steps (c)-(e) are carried out in the presence of induction heating, radiant heating or a combination of both.

18 . The method according to claim 11 , further comprising removing the ceramic support from the metal object.

19 . The method according to claim 11 , wherein the cast component is an airfoil.

20 . The method according to claim 18 , wherein the airfoil has a single crystal structure.

Assignees

• Gen Electric

Inventors

• Garay Gregory Terrence
• Meyer Mark Kevin
• Konitzer Douglas Gerard
• Carter William Thomas

Classifications

• F05D2230/22

  by sintering · CPC title

• B22F10/64

  by thermal means (control of energy beam parameters for post heating B22F10/364) · CPC title

• B22F10/40

  Structures for supporting workpieces or articles during manufacture and removed afterwards · CPC title

• B22F12/43

  pulsed; frequency modulated · CPC title

• B22F10/36

  of energy beam parameters · CPC title