Nesim Abuaf

US Patent:

6382300, May 7, 2002

Filed:

May 24, 2001

Appl. No.:

09/863185

Inventors:

Ching Pang Lee - Cincinnati OH
Wayne Charles Hasz - Pownal VT
Nesim Abuaf - Schenectady NY
Robert Alan Johnson - Simpsonville SC

Assignee:

General Electric Company - Schenectady NY

International Classification:

B22C 700

US Classification:

164246, 164235, 164 45, 164 35, 164516

Abstract:

A casting includes a heat transfer surface having a plurality of cavities. The plurality of cavities include a density of at least about 25 cavities per square centimeter to about 1,100 cavities per square centimeter resulting in increased surface area and therefore enhanced heat transfer capability. Also disclosed is a mold for forming a pattern for molding the casting. The mold includes a surface defining a portion of a chamber to which are attached a plurality of particles having an average particle size in a range of about 300 microns to about 2,000 microns.

US Patent:

6399217, Jun 4, 2002

Filed:

Dec 20, 1999

Appl. No.:

09/466957

Inventors:

Wayne C. Hasz - Pownal VT
Nesim Abuaf - Schenectady NY
Robert A. Johnson - Simpsonville SC

Assignee:

General Electric Company - Schenectady NY

International Classification:

B32B 314

US Classification:

428611, 428614, 228185

Abstract:

A surface of an article, for example an external fluid flow surface, includes a plurality of metal wires lengthwise of the wires along the article surface. The article can be in the form of a component of an apparatus, for example a component of a gas turbine engine, the wires being bonded along and modifying surface characteristics of the article. Also, the article can be in the form of a bonding layer, for example a brazing tape, including the metal wires carried along a surface of the layer.

US Patent:

6402464, Jun 11, 2002

Filed:

Aug 29, 2000

Appl. No.:

09/650864

Inventors:

Wayne Charles Hasz - Pownal VT
Robert Alan Johnson - Simpsonville SC
Nesim Abuaf - Lincoln City OR

Assignee:

General Electric Company - Schenectady NY

International Classification:

F04D 3100

US Classification:

415116, 228246, 165133, 165908

Abstract:

An annular turbine shroud separates a hot gas path from a cooling plenum containing a cooling medium. Bumps are cast in the surface on the cooling side of the shroud. A surface coating overlies the cooling side surface of the shroud, including the bumps, and contains cooling enhancement material. The surface area ratio of the cooling side of the shroud with the bumps and coating is in excess of a surface area ratio of the cooling side surface with bumps without the coating to afford increased heat transfer across the element relative to the heat transfer across the element without the coating.

US Patent:

6426152, Jul 30, 2002

Filed:

Dec 14, 2000

Appl. No.:

09/737089

Inventors:

Robert Alan Johnson - Simpsonville SC
Jon Conrad Schaeffer - Greenville SC
Nesim Abuaf - Lincoln City OR
Wayne Charles Hasz - Pownal VT

Assignee:

General Electric Company - Schenectady NY

International Classification:

B22F 500

US Classification:

428553, 428559, 428573, 428601, 427142, 298891, 298971, 228119

Abstract:

Castings for gas turbine parts exposed on one side to a high-temperature fluid medium have cast-in bumps on an opposite cooling surface side to enhance heat transfer. Areas on the cooling surface having defectively cast bumps, i. e. , missing or partially formed bumps during casting, are coated with a braze alloy and cooling enhancement material to salvage the part.

US Patent:

6468669, Oct 22, 2002

Filed:

May 3, 1999

Appl. No.:

09/304276

Inventors:

Wayne Charles Hasz - Pownal VT
Robert Alan Johnson - Simpsonville SC
Mark Gerard Rettig - Cincinnati OH
Nesim Abuaf - Niskayuna NY
John Howard Starkweather - Cincinnati OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

B32B 1516

US Classification:

428553, 428558, 428559, 428687

Abstract:

An article includes turbulation material bonded to a surface of a substrate via a bonding agent, such as a braze alloy. In an embodiment, the turbulation material includes a particulate phase of discrete metal alloy particles having an average particle size within a range of about 125 microns to about 4000 microns. Other embodiments include methods for applying turbulation and articles for forming turbulation.

US Patent:

6478540, Nov 12, 2002

Filed:

Dec 19, 2000

Appl. No.:

09/739445

Inventors:

Nesim Abuaf - Lincoln City OR
Kevin Joseph Barb - Halfmoon NY
Sanjay Chopra - Greenville SC
David Max Kercher - Ipswich MA
Iain Robertson Kellock - Simpsonville SC
Dean Thomas Lenahan - Cincinnati OH
Sankar Nellian - Mauldin SC
John Howard Starkweather - Sharonville OH
Douglas Arthur Lupe - Ballston Lake NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

F01D 518

US Classification:

416 1, 416 97 R, 416193 A

Abstract:

A turbine bucket includes an airfoil extending from a platform, having high and low pressure sides; a wheel mounting portion; a hollow shank portion located radially between the platform and the wheel mounting portion, the platform having an under surface. An impingement cooling plate is located in the hollow shank portion, spaced from the under surface, and the impingement plate is formed with a plurality of impingement cooling holes therein.

US Patent:

6502622, Jan 7, 2003

Filed:

Feb 12, 2002

Appl. No.:

10/073590

Inventors:

Ching Pang Lee - Cincinnati OH
Wayne Charles Hasz - Pownal VT
Nesim Abuaf - Schenectady NY
Robert Alan Johnson - Simpsonville SC

Assignee:

General Electric Company - Niskayuna NY

International Classification:

B22C 702

US Classification:

164 35, 164 45

Abstract:

A casting includes a heat tranfer surface having a pluality of cavities. The plurality of cavities includes a density of at least about 25 cavities per square centimeter to about 1,100 cavities per square centimeter resulting in increased surface area and therefore enhanced heat transfer capability. Also disclosed is a mold for forming a pattern for molding the casting. The mold includes a surface defining a portion of a chamber to which are attached a plurality of particles having an average particle size in a range of about 300 microns to about 2,000 microns.

US Patent:

6505673, Jan 14, 2003

Filed:

Dec 28, 1999

Appl. No.:

09/473295

Inventors:

Nesim Abuaf - Schenectady NY
Wayne Charles Hasz - Pownal VT
Robert Alan Johnson - Simpsonville SC
Frederick Alan Buck - Sharonville OH

Assignee:

General Electric Company - Niskayuna NY

International Classification:

B22C 702

US Classification:

164 45, 164138, 164 47

Abstract:

A method of forming a turbine engine component, includes providing a mold having a textured region, pouring a molten alloy into the mold, and cooling the molten alloy to form a turbine engine component, wherein the turbine engine component has an enhanced surface area region corresponding to the textured region of the mold, the enhanced surface area region comprising randomly arranged bumps.