Dinesh O Gupta

US Patent:

7575039, Aug 18, 2009

Filed:

Oct 15, 2003

Appl. No.:

10/685631

Inventors:

James T. Beals - West Hartford CT, US
Joshua Persky - Manchester CT, US
Dilip M. Shah - Glastonbury CT, US
Venkat Seetharaman - Rocky Hill CT, US
Sudhangshu Bose - Manchester CT, US
Jacob Snyder - Southington CT, US
Keith Santeler - Middletown CT, US
Carl Verner - Windsor CT, US
Stephen D. Murray - Marlborough CT, US
John Marcin - Marlborough CT, US
Dinesh Gupta - South Windsor CT, US
Daniel A. Bales - Avon CT, US
Daniel Francis Paulonis - Higganum CT, US
Glenn Cotnoir - Thompson CT, US
John Wiedemer - Glastonbury CT, US

Assignee:

United Technologies Corporation - Hartford CT

International Classification:

B22C 9/10

US Classification:

164369

Abstract:

A refractory metal core for use in a casting system has a coating for providing oxidation resistance during shell fire and protection against reaction/dissolution during casting. In a first embodiment, the coating includes at least one oxide and a silicon containing material. In a second embodiment, the coating includes an oxide selected from the group of calcia, magnesia, alumina, zirconia, chromia, yttria, silica, hafnia, and mixtures thereof. In a third embodiment, the coating includes a nitride selected from the group of silicon nitride, sialon, titanium nitride, and mixtures thereof. Other coating embodiments are described in the disclosure.

US Patent:

59217510, Jul 13, 1999

Filed:

Dec 19, 1995

Appl. No.:

8/575116

Inventors:

Melvin Freling - West Hartford CT
Dinesh K. Gupta - South Windsor CT

Assignee:

United Technologies Corporation - Hartford CT

International Classification:

F04D 2944

US Classification:

415200

Abstract:

In a gas turbine engine, a method and apparatus for containing molten materials and ignited titanium and titanium alloys within the confines of the turbine engine environment. The method includes the step of first applying a bond coating to the inner surface of the outer compressor casing. The bond coating is then plasma oversprayed with a non-reactive, thermally insulative ceramic top coating. The apparatus includes a substrate having a bond coating and a ceramic top coating, surrounding at least a portion of the gas turbine engine, for containing turbine engine fires within the turbine engine environment. Preferably, the bond coating is a Ni--Co--Cr--Al--Y alloy, and the top coat is stabilized zirconia.

US Patent:

46158650, Oct 7, 1986

Filed:

Jul 12, 1983

Appl. No.:

6/512945

Inventors:

David S. Duvall - Cobalt CT
Dinesh K. Gupta - Vernon CT

Assignee:

United Technologies Corporation - Hartford CT

International Classification:

B32B 1501
B32B 1520
C22C 1903
C22C 3000

US Classification:

420588

Abstract:

Improved coating compositions are described for the protection of superalloys at elevated temperatures. The coatings of the NiCrAlY or NiCoCrAlY type are significantly improved by the use of higher levels of yttrium.

US Patent:

61901245, Feb 20, 2001

Filed:

Nov 26, 1997

Appl. No.:

8/979065

Inventors:

Melvin Freling - West Hartford CT
Dinesh K. Gupta - South Windsor CT
Ken Lagueux - Berlin CT

Assignee:

United Technologies Corporation - Hartford CT

International Classification:

F01D 514

US Classification:

4151734

Abstract:

A gas turbine engine seal system includes a rotating member having an abrasive tip disposed in rub relationship to a stationary, abradable seal surface. The abrasive tip comprises a zirconium oxide abrasive coat having a columnar structure that is harder than the abradable seal surface such that the abrasive tip can cut the abradable seal surface.

US Patent:

54511429, Sep 19, 1995

Filed:

Mar 29, 1994

Appl. No.:

8/219559

Inventors:

Alan Cetel - West Hartford CT
Dinesh K. Gupta - Vernon CT

Assignee:

United Technologies Corporation - Hartford CT

International Classification:

F01D 528

US Classification:

416241R

Abstract:

Blades for use in modern gas turbine engines are described and are characterized by a thin zone of fine grains of a high strength composition on the surface of the blade root.

US Patent:

6270852, Aug 7, 2001

Filed:

Oct 14, 1999

Appl. No.:

9/417861

Inventors:

Nicholas E. Ulion - Marlborough CT
Jeanine T. Marcin - Marlborough CT
Dinesh K. Gupta - South Windsor CT
Sudhangshu Bose - Manchester CT

Assignee:

United Technologies Corporation - Hartford CT

International Classification:

C23C 404

US Classification:

427454

Abstract:

A thermal barrier coating system for a superalloy substrate is disclosed. The superalloy is preferably of the type that is capable of forming an adherent alumina layer. A bond coat is applied to a local area of the substrate, so that a portion of the substrate remains exposed. The localized area is defined to be the area(s) at which a TBC typically fails first, e. g. , the leading and trailing edges of an airfoil, or other area. An alumina layer is formed on the remaining portion of the substrate, and also on the bond coat. A ceramic layer is then applied on the alumina layer. Even if the ceramic material is removed, the localized bond coat remains, and reduces the rate at which the underlying substrate oxidizes. A coated article is also disclosed, as is a system that utilizes a conventional superalloy and aluminide coating with the localized bond coat.