Richard R Worthing

US Patent:

20030116237, Jun 26, 2003

Filed:

Dec 20, 2001

Appl. No.:

10/029350

Inventors:

Richard Worthing - Cincinnati OH, US
Shannon Cismoski - Cincinnati OH, US

International Classification:

C22F001/00

US Classification:

148/535000

Abstract:

A process of rejuvenating a diffusion aluminide coating on a component. The rejuvenation process involves treating the coating with an aqueous solution of nitric acid and phosphoric acid until at least part of the additive layer of the coating has been removed, but the diffusion zone underlying the additive layer remains. The exposed surface of the component is then re-aluminized to deposit additional aluminum to build up the additive layer to a desired thickness. While potentially useful for a variety of situations, the process is particularly applicable to a diffusion aluminide coating that has been deposited on a component to have an excessively thick additive layer, and prior to the component being returned to service.

US Patent:

20050161439, Jul 28, 2005

Filed:

Jan 9, 2003

Appl. No.:

10/339475

Inventors:

Roger Wustman - Mason OH, US
Mark Rosenzweig - Hamilton OH, US
William Brooks - Lebanon OH, US
Brian Pilsner - Mason OH, US
James Risbeck - Cincinnati OH, US
Richard Worthing - Cincinnati OH, US

International Classification:

B44C001/22

US Classification:

216103000

Abstract:

A method for selectively removing an aluminide coating from at least one surface of a metal-based substrate by: (a) contacting the surface of the substrate with at least one stripping composition comprising nitric acid at a temperature less than about 20 C. to degrade the coating without damaging the substrate; and (b) removing the degraded coating without damaging the substrate. Also disclosed is a method for replacing a worn or damaged aluminide coating on at least one surface of a metal-based substrate by selectively removing the coating using the above steps, and then applying a new aluminide coating to the surface of the substrate. Turbine engine parts, such as high-pressure turbine blades, treated using the above methods are also disclosed.

US Patent:

20050244274, Nov 3, 2005

Filed:

Jun 30, 2005

Appl. No.:

11/171686

Inventors:

Roger Wustman - Mason OH, US
Mark Rosenzweig - Hamilton OH, US
William Brooks - Lebanon OH, US
Brian Pilsner - Mason OH, US
James Risbeck - Cincinnati OH, US
Richard Worthing - Cincinnati OH, US

International Classification:

C23G001/02

US Classification:

41624100R

Abstract:

A method for selectively removing an aluminide coating from at least one surface of a metal-based substrate by: (a) contacting the surface of the substrate with at least one stripping composition comprising nitric acid at a temperature less than about 20 C. to degrade the coating without damaging the substrate; and (b) removing the degraded coating without damaging the substrate. Also disclosed is a method for replacing a worn or damaged aluminide coating on at least one surface of a metal-based substrate by selectively removing the coating using the above steps, and then applying a new aluminide coating to the surface of the substrate. Turbine engine parts, such as high-pressure turbine blades, treated using the above methods are also disclosed.

US Patent:

20050268942, Dec 8, 2005

Filed:

Jun 17, 2005

Appl. No.:

11/155812

Inventors:

Howard Farr - Blue Ash OH, US
Keith Betscher - West Chester OH, US
Richard Worthing - Cincinnati OH, US
D. Sangeeta - Cincinnati OH, US
Himanshu Vakil - Niskayuna NY, US
Curtis Johnson - Niskayuna NY, US
Thomas Cartier - Scotia NY, US
Edward Stokes - Charlotte NC, US
Heinz Jaster - Schenectady NY, US
Alexander Allen - Houston TX, US

Assignee:

GENERAL ELECTRIC COMPANY - Schenectady NY

International Classification:

B08B007/00

US Classification:

134010000, 134026000, 134019000

Abstract:

Apparatus for stripping ceramic coatings from the surfaces of articles. The apparatus includes a dedicated pressure vessel, such as an autoclave, which is maintained at an elevated temperature. Caustic solution is preheated to a first elevated temperature before injecting it into the autoclave, and the caustic solution is filtered and cooled after use in the autoclave. The articles are stripped of coating by maintaining the articles at an elevated temperature and pressure for a predetermined time. Various options include the use of analytical equipment to maintain the chemistry of the caustic solution and use of a volatile organic solution to prepressurize the autoclave and shorten cycle time. The autoclave is maintained in a nitrogen chamber to minimize the risks associated with volatile components. The articles are transferred to a separate pressure vessel after completion of the stripping operation so that the autoclave used for stripping can be maintained at an elevated temperature, thereby shortening the cycle time for stripping of additional articles.

US Patent:

58979662, Apr 27, 1999

Filed:

Feb 26, 1996

Appl. No.:

8/606903

Inventors:

Warren D. Grossklaus - West Chester OH
Richard R. Worthing - Cincinnati OH

Assignee:

General Electric Company - Cincinnati OH

International Classification:

B32B 1510
C22F 109

US Classification:

428652

Abstract:

An environmental resistant spot type coating is provided on a selected, discrete surface area of a high temperature operating article, by applying to the area a layer of at least one of the elements selected from Pt, Rh and Pd, and preferably Pt, to a thickness of about 0. 0002" to less than 0. 0006" and an average distribution of at least about 0. 07 grams per square inch. The layer is heated at about 1800-2050. degree. F. for about 1/2-4 hours to diffuse the element with the surface area. Then the layer is aluminided to provide an average total coating thickness of about 0. 001-0. 005". The article provided includes an environmental resistant additive coating diffused with the selected discrete area. The coating comprises an outer portion of at least about 17 wt. % of the selected element, and an aluminide of the surface area or substrate.

US Patent:

60205717, Feb 1, 2000

Filed:

Dec 31, 1998

Appl. No.:

9/223792

Inventors:

Warren D. Grossklaus - West Chester OH
Richard R. Worthing - Cincinnati OH
Lawrence J. Roedl - West Chester OH
John M. Powers - Independence KY
Thomas F. Broderick - Springboro OH

Assignee:

General Electric Company - Cincinnati OH

International Classification:

B23K 1000

US Classification:

21912146

Abstract:

An apparatus and method for welding a superalloy article. The apparatus generally entails an enclosure adapted for containing a superalloy article, a polarity-reversing plasma transferred arc welder apparatus for welding a localized region of the article, an induction coil for heating the localized region, and elements for sensing and controlling the temperature of the localized region. The induction coil is placed in close proximity to the localized region of the article so that the temperature of the localized region is largely determined and quickly altered by the output of the coil. The polarity-reversing plasma transferred arc welding apparatus is operated at very low currents of not more than forty-five amps, so that the welding apparatus has only a secondary heating affect compared to the induction coil.

US Patent:

61245682, Sep 26, 2000

Filed:

Dec 31, 1998

Appl. No.:

9/223793

Inventors:

Thomas F. Broderick - Springboro OH
Richard R. Worthing - Cincinnati OH
Lawrence J. Roedl - West Chester OH
John M. Powers - Independence KY
Warren D. Grossklaus - West Chester OH

Assignee:

General Electric Company - Cincinnati OH

International Classification:

B23K 923

US Classification:

219137WM

Abstract:

A heating apparatus and method for welding a superalloy article. The apparatus and method of this invention provide for pre-weld and post-weld heat treatments to be performed on an article within the same enclosure in which the welding operation is performed. The apparatus accurately controls the temperature of the component to be welded throughout the temperature treatment profiles with the use of means for welding the article, means for heating the article, and means for sensing the article temperature. The apparatus also works in conjunction with a memory storage device that stores appropriate pre-weld and post-weld heat treatment temperature profiles and a welding temperature profile for the article.

US Patent:

20020066470, Jun 6, 2002

Filed:

Jan 16, 2002

Appl. No.:

10/050660

Inventors:

Howard Farr - Blue Ash OH, US
Keith Betscher - West Chester OH, US
Richard Worthing - Cincinnati OH, US
D. Sangeeta - Cincinnati OH, US
Himanshu Vakil - Niskayuna NY, US
Curtis Johnson - Schenectary NY, US
Thomas Cartier - Scotia NY, US
Edward Stokes - Niskayuna NY, US
Heinz Jaster - Schenectady NY, US
Alexander Allen - Houston TX, US

International Classification:

B08B003/08
B08B003/10

US Classification:

134/010000, 134/105000, 134/107000, 134/111000, 134/113000, 134/018000, 134/019000

Abstract:

Apparatus for stripping ceramic coatings from the surfaces of articles. The apparatus includes a dedicated pressure vessel, such as an autoclave, which is maintained at an elevated temperature. Caustic solution is preheated to a first elevated temperature before injecting it into the autoclave, and the caustic solution is filtered and cooled after use in the autoclave. The articles are stripped of coating by maintaining the articles at an elevated temperature and pressure for a predetermined time. Various options include the use of analytical equipment to maintain the chemistry of the caustic solution and use of a volatile organic solution to prepressurize the autoclave and shorten cycle time. The autoclave is maintained in a nitrogen chamber to minimize the risks associated with volatile components. The articles are transferred to a separate pressure vessel after completion of the stripping operation so that the autoclave used for stripping can be maintained at an elevated temperature, thereby shortening the cycle time for stripping of additional articles.