General Electric Company

General Electric Technology Gmbh

Liming Zhang

Jere Allen Johnson, Jr

Hong Qing Zhou

Yingna Wu

Yong Liang Liu

Canan Uslu Hardwicke

Hui Zhu

Wenqing Peng

John David Ward, Jr

Christopher Edward Thompson

Chuan Lin

Yanfei Gu

Cem Murat Eminoglu

Ying Zhou

Lawrence James Whims

Zhida Pan

Lei Cao

Wusheng Xu

Jianping Wu

Youhao Yang

Yanping Liu

Yibo Gao

Limin Wang

Jianzhi Zhao

Xubin Gao

David Clayton Van Nest, Iii

Iii David Clayton Van Nest

John David Ward Jr

A method for removing oxide materials from a crack of a metallic workpiece comprises: infiltrating an alkali solution into the crack in a pressurized atmosphere or an ultrasonic environment; applying an energy to the crack to react the oxide materials with the alkali solution and form a resultant material; and rinsing the resultant material with an acid solution to remove the resultant material from the crack. The method is easier to penetrate into the inside of the cracks, in particular suitable for cleaning narrow and deep cracks.

Method for removing oxide materials from a crack

A method includes masking at least one hole of an article with a paste, wherein the hole opens onto a surface of the article, applying a coating to the surface of the article, and removing the paste including contacting the paste with water, leaving at least one open hole in the surface of the coated article. The paste includes about 40-80 wt % of a filler material, about 0.5-20 wt % of an inorganic binder, about 0.5-15 wt % of a polyhydroxy compound and about 5-25 wt % of water. The filler material includes a first material which includes alkali metal doped alumina, zirconium oxide, titanium oxide, silicon dioxide, or a combination thereof and a second material which includes a silicate. A weight ratio between the first and second materials is in a range of about 1-10.

Method of coating an article, paste and plug for preventing hole blockage during coating

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.

Method for selective aluminide diffusion coating removal

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/HPOat a predetermined temperature for a predetermined amount of time, the HCl/HPOsolution 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/HPOsolution and quickly immersed in a solution of NaOH for a predetermined amount of time to at least partially desmut the surface.

Method for smut removal during stripping of coating

A coating process for applying a bifurcated coating to an article is disclosed including applying an aluminizing slurry to a first portion of the article, applying a chromizing slurry to a second portion of the article, and simultaneously heat treating the article, the aluminizing slurry, and the chromizing slurry. Heat treating the aluminizing slurry forms an aluminide coating on the first portion of the article and an aluminide diffusion zone between the article and the aluminide coating. Heat treating the chromizing slurry forms a chromide coating on the second portion of the article and a chromide diffusion zone between the article and the chromide coating. The first portion and the second portion are both maintained in an unmasked state while applying the aluminizing slurry and the chromizing slurry and during the heat treating.

Coating process for applying a bifurcated coating

Methods for deposition of an aluminide coating on an alloy component positioned within a coating compartment of a retort chamber are provided. According to the method, the coating compartment is purged with an inert gas via a first gas line; a positive pressure is created within the coating compartment utilizing the inert gas; the coating compartment is heated to a deposition temperature; and at least one reactant gas is introduced into the coating compartment while at the positive pressure and the deposition temperature to form an aluminide coating on a surface of the alloy component. Retort coating apparatus are also provided.

Apparatus and methods for slurry aluminide coating repair

A method for removing oxide from a metallic substrate is described. The method includes providing a stream of boron trifluoride; heating the metallic substrate at a first temperature; and heating the metallic substrate at a second temperature different from the first temperature. An associated apparatus is also described.

Method and apparatus for removing oxide from metallic substrate

Various embodiments of the invention include methods for monitoring a gas turbine component. In some cases, a method includes: analyzing a gas turbomachine component to detect at least one of a void or a porosity of the gas turbomachine component while maintaining a structural integrity of the gas turbomachine component during the analyzing; and providing instructions to perform a hot isostatic pressing (HIP) process on the gas turbomachine component in response to at least one of detecting the void or detecting that the porosity exceeds a threshold.

Gas turbine component monitoring

A method for refreshing an acid bath solution includes determining a concentration of phosphoric acid in the acid bath solution and determining a concentration of hydrochloric acid in the acid bath solution. The method further includes calculating a volume of phosphoric acid to add to the acid bath solution to achieve a predetermined concentration of phosphoric acid in the acid bath solution. In addition, the method includes calculating a volume of hydrochloric acid to add to the acid bath solution with the volume of phosphoric acid to increase the acid bath solution to a predetermined volume, and adding the volume of phosphoric acid and the volume of hydrochloric acid to the acid bath solution.

Method for refreshing an acid bath solution

A method for controlled removal of a portion of a diffusion coating from a coated superalloy component and a method for rejuvenating a coated superalloy component are provided. The methods include providing the component having an oxide layer, an additive layer between the oxide layer and a diffusion zone, the diffusion zone being between the additive layer and a superalloy substrate of the superalloy component. The methods include selectively removing the oxide layer and a portion of the additive layer by grit blasting, wherein removing creates an exposed portion. Rejuvenating includes applying an aluminide coating to the exposed portion and heat treating at a preselected elevated temperature to form a rejuvenated protective aluminide coating on the superalloy component.

Method for removing a coating and a method for rejuvenating a coated superalloy component

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Greer, SC, United States of America

Liming Zhang