Irene T Spitsberg

US Patent:

6340500, Jan 22, 2002

Filed:

May 11, 2000

Appl. No.:

09/569912

Inventors:

Irene Theodor Spitsberg - Loveland OH

Assignee:

General Electric Company - Cincinnati OH

International Classification:

C23C 1600

US Classification:

427250, 427355, 427367, 427379, 4273831, 427405, 72 53, 416241 R

Abstract:

A method for improving the thermal fatigue life of a thermal barrier coating (TBC) deposited on an aluminide bond coat through a process by which the surface morphology of the aluminide bond coat is modified to eliminate or at least reduce oxidation and oxidation-induced convolutions at the alumina-bond coat interface, as explained more fully below. The bond coat is deposited to have generally columnar grains and grain boundary ridges at its surface, and is then peened at an intensity sufficient to flatten at least some of the grain boundary ridges, but insufficient to cause recrystallization of the bond coat when later heated, such as during deposition of the thermal barrier coating. In so doing, the original surface texture of the bond coat is altered to be smoother where the grain boundaries meet the bond coat surface, thereby yielding a smoother bond coat surface where the critical alumina-bond coat interface will exist following oxidation of the bond coat.

US Patent:

6383306, May 7, 2002

Filed:

Feb 28, 2000

Appl. No.:

09/513871

Inventors:

Irene T. Spitsberg - Loveland OH
Jeffrey A. Pfaendtner - Blue Ash OH
Joseph D. Rigney - Milford OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

C23C 2802

US Classification:

148208, 148220, 148518, 148535

Abstract:

A nickel-base superalloy article substrate has more nickel than any other element and a nominal bulk composition of carbon. A protective layer is deposited overlying the surface of the article substrate. The protective layer includes aluminum and one or more of the reactive elements hafnium, zirconium, yttrium, lanthanum, and cerium. The depositing of the protective layer includes steps of decarburizing locations where the carbon may serve as a barrier to the mobility of the reactive elements within the protective layer, and depositing an aluminum-containing protective layer overlying the substrate. The decreasing of the carbon concentration may be accomplished. by decarburizing the substrate, depositing a platinum-containing layer and then decarburizing, depositing an aluminum-containing layer in a reducing atmosphere, and/or decarburizing the deposited protective layer. A ceramic thermal barrier coating may be deposited overlying the protective layer.

US Patent:

6387456, May 14, 2002

Filed:

Sep 5, 2000

Appl. No.:

09/655123

Inventors:

William Patrick Allen - Portland CT
Nathan S. Jacobson - Westlake OH
Narottam P. Bansal - North Olmsted OH
Elizabeth J. Opila - Lakewood OH
James L. Smialek - Strongsville OH
Kang N. Lee - Westlake OH
Irene T. Spitsberg - Loveland OH
Hongyu Wang - Niskayuna NY
Peter Joel Meschter - Niskayuna NY
Krishan Lal Luthra - Schenectady NY

Assignee:

General Electric Company - NY
United Technologies Corporation - DE
The United States of America as represented by the Administrator of the National Aeronautics and Space Administration - Washington DC

International Classification:

C23C 406

US Classification:

427452, 427450, 427453

Abstract:

A barrier layer for a silicon containing substrate which inhibits the formation of gaseous species of silicon when exposed to a high temperature aqueous environment comprises a barium-strontium alumino silicate.

US Patent:

6391475, May 21, 2002

Filed:

Mar 10, 2000

Appl. No.:

09/522875

Inventors:

Irene T. Spitsberg - Loveland OH
David J. Wortman - Niskayuna NY
Jon C. Schaeffer - Greenville SC
Joseph D. Rigney - Milford OH

Assignee:

General Electric Company - Cincinnati OH

International Classification:

B32B 1504

US Classification:

428652, 428632, 428680, 416241 B

Abstract:

A nickel-base superalloy substrate has an overlying protective coating including a modified aluminum-containing protective layer. The modified aluminum-containing protective layer is formed of nickel, aluminum, calcium in an amount of from about 50 to about 300 parts per million by weight, and, optionally, elements interdiffused into the modified aluminum-containing protective layer from the substrate. Magnesium or barium may be used instead of or in addition to the calcium. A ceramic layer may overlie the modified aluminum-containing protective layer.

US Patent:

6410148, Jun 25, 2002

Filed:

Apr 15, 1999

Appl. No.:

09/292349

Inventors:

William Patrick Allen - Portland CT
Nathan S. Jacobson - Westlake OH
Elizabeth J. Opila - Lakewood OH
James L. Smialek - Strongsville OH
Kang N. Lee - Westlake OH
Irene T. Spitsberg - Loveland OH
Hongyu Wang - Niskayuna NY
Peter Joel Meschter - Niskayuna NY
Krishan Lal Luthra - Schenectady NY

Assignee:

General Electric Co. - New York
United Technologies Corp. - DE
The United States of America as represented by the Administrator of the National Aeronautics and Space Administration - Washington DC

International Classification:

B32B 900

US Classification:

428446, 428448, 428472, 4284722, 428701, 428702

Abstract:

A barrier layer for a silicon containing substrate which inhibits the formation of gaseous species of silicon when exposed to a high temperature aqueous environment comprises a barium-strontium alumino silicate.

US Patent:

6444053, Sep 3, 2002

Filed:

Feb 28, 2000

Appl. No.:

09/513869

Inventors:

Irene T. Spitsberg - Loveland OH
Joseph D. Rigney - Milford OH
Jeffrey A. Pfaendtner - Blue Ash OH

Assignee:

General Electric Co. - Schenectady NY

International Classification:

C23C 820

US Classification:

148208, 148518, 148535

Abstract:

A nickel-base superalloy article substrate has more nickel than any other element, a reactive element that is hafnium, zirconium, yttrium, lanthanum, or cerium, or combinations thereof, and a nominal bulk composition of carbon. A protective layer is deposited overlying the surface of the article substrate. The depositing of the protective layer includes steps of decarburizing locations where the carbon serves as a barrier to the diffusion of the reactive element from the substrate into the protective layer, and depositing an aluminum-containing protective layer overlying the substrate. The decreasing of the carbon concentration may be accomplished by decarburizing the substrate, depositing a platinum-containing layer and then decarburizing, depositing an aluminum-containing layer in a reducing atmosphere, or decarburizing the deposited protective layer. A ceramic thermal barrier coating may be deposited overlying the protective layer.

US Patent:

6444335, Sep 3, 2002

Filed:

Apr 6, 2000

Appl. No.:

09/543956

Inventors:

Hongyu Wang - Niskayuna NY
Irene T. Spitsberg - Loveland OH
Bangalore A. Nagaraj - West Chester OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

B32B 900

US Classification:

428701, 428446, 428697, 428698, 428699, 428702, 416241 B

Abstract:

A coating system for Si-containing material, such as those used to form articles exposed to high temperatures, including the hostile thermal environment of a gas turbine engine. The coating system is a compositionally-graded thermal/environmental barrier coating (T/EBC) system that exhibits improved mechanical integrity for high application temperatures that necessitate thick protective coatings. The T/EBC system includes an intermediate layer containing YSZ and BSAS, mullite and/or alumina, which is preferably used in combination with a mullite-containing layer that overlies the surface of the Si-containing material, a layer of BSAS between the mullite-containing layer and the intermediate layer, and a thermal-insulating top coat of YSZ overlying the intermediate layer.

US Patent:

6455167, Sep 24, 2002

Filed:

Jul 2, 1999

Appl. No.:

09/345002

Inventors:

Joseph D. Rigney - Milford OH
Irene T. Spitsberg - Loveland OH
Ramgopal Darolia - West Chester OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

B32B 1500

US Classification:

4284722, 428469, 428472, 428702, 416241 R

Abstract:

A coating is described for use on a superalloy substrate comprising a diffusion barrier as an intermediate layer overlying the substrate and underlying a protective coating having a high aluminum content. The diffusion barrier layer is characterized by having low interdiffusivity for elements from the substrate and the coating, a minimal impact on the mechanical properties of the article which is coated, and can be achieved readily using existing coating application techniques or post heat treat processes. The diffusion barrier layer is preferably an oxide ceramic.