公开(公告)号：US10125425B2

公开(公告)日：2018-11-13

申请号：US13932394

申请日：2013-07-01

Applicant: GENERAL ELECTRIC COMPANY

Inventor： John David Ward, Jr. ,  Liming Zhang

IPC: C23G1/02 ,  C23F1/20 ,  C23F1/28 ,  C23F1/44 ,  C23G1/20 ,  F01D5/00

Abstract: Stripping a metallic bond coat from an article using a wet chemical process. An article removed from service and having a metallic bond coat applied over a surface of its metallic substrate is provided. The metallic bond coat is used to improve the adhesion of a TBC to the article, so grit blasting to first remove any TBC applied over the bond coat and which still remains on the article initially may be required. The bond coated article is then immersed in an acid solution of HCl/H3PO4 at a predetermined temperature for a predetermined amount of time, the HCl/H3PO4 solution reacting with the bond coat applied over the metallic substrate to form a smut on the surface. The article is then removed from the HCl/H3PO4 solution and quickly immersed in a solution of NaOH for a predetermined amount of time to at least partially desmut the surface.

公开(公告)号：US20170120399A1

公开(公告)日：2017-05-04

申请号：US14926126

申请日：2015-10-29

Applicant: General Electric Company

Inventor： Jere Allen Johnson, JR. ,  Liming Zhang ,  Curtis Joseph Lusby

IPC: B23P6/00 ,  F01D25/00 ,  C22F1/10 ,  B23K9/173 ,  B23K26/34 ,  B23K31/02 ,  F01D9/02 ,  B23K15/00

CPC classification number: B23P6/002 ,  B23K9/044 ,  B23K9/167 ,  B23K9/173 ,  B23K15/0086 ,  B23K15/0093 ,  B23K26/34 ,  B23K31/02 ,  B23K2101/001 ,  B23K2103/08 ,  B23K2103/26 ,  C21D9/50 ,  C22F1/10 ,  F01D5/005 ,  F01D9/02 ,  F01D25/005 ,  F05D2220/32 ,  F05D2230/232 ,  F05D2230/41

Abstract: In one aspect, the present disclosure is directed to a method for treating a region of a gas turbine component. The method includes heating the region to a first temperature. One or more surface discontinuities located in the region are welded such that at least a portion of the region is heated to a second temperature. The region is annealed at a third temperature. The second temperature is relatively greater than the first temperature, and the first temperature is relatively greater than the third temperature.

公开(公告)号：US20240229244A9

公开(公告)日：2024-07-11

申请号：US17971898

申请日：2022-10-24

Applicant: General Electric Company

Inventor： Bangalore Aswatha Nagaraj ,  Liming Zhang

IPC: C23C28/02 ,  B32B15/01 ,  C23C10/08 ,  C23C10/60 ,  C25D3/12 ,  C25D3/50 ,  C25D5/12 ,  C25D5/50

CPC classification number: C23C28/022 ,  B32B15/017 ,  C23C10/08 ,  C23C10/60 ,  C25D3/12 ,  C25D3/50 ,  C25D5/12 ,  C25D5/50

Abstract: Methods of forming a coating system on a surface of a cobalt-based superalloy component are provided. The method includes forming a nickel-based primer layer on the surface of the cobalt-based superalloy component; forming an intermediate nickel-containing layer on the nickel-based primer layer; and heat treating the cobalt-based superalloy component to form a diffusion coating on the surface of the cobalt-based superalloy component. The intermediate nickel-containing layer includes nickel, chromium, and aluminum. Coated cobalt-based superalloy components formed from such a method are also provided.

公开(公告)号：US10590800B2

公开(公告)日：2020-03-17

申请号：US15310805

申请日：2014-09-25

Applicant: GENERAL ELECTRIC COMPANY ,  Liming Zhang ,  Jere A. Johnson ,  Ying Zhou

Inventor： Liming Zhang ,  Jere A. Johnson ,  Ying Zhou

IPC: C23C10/08 ,  F01D25/14 ,  C23C10/28 ,  C23C10/60 ,  C23F4/04 ,  C23F1/02 ,  B24C1/08 ,  C23F1/20 ,  C23F4/02 ,  F01D25/00

Abstract: A method for selective aluminide diffusion coating removal. The method includes diffusing aluminum into a substrate surface of a component to form a diffusion coating. The diffusion coating includes an aluminum-infused additive layer and an interdiffusion zone. The diffusion coating is solution heat treated at a temperature and for a time sufficient to dissolve at least a portion of the interdiffusion zone. Thereafter the aluminum-infused additive layer is selectively removed. An aluminide diffusion coated turbine component is also disclosed.