Laxmappa G Hosamani

US Patent:

7803313, Sep 28, 2010

Filed:

Jun 29, 2007

Appl. No.:

11/824306

Inventors:

Jedidiah David Rust - Golden CO, US
Michael Charles Watt - Firestone CO, US
Laxmappa Hosamani - Lafayette CO, US
Jason Joseph Schmertman - Houston TX, US

Assignee:

Precision Castparts Corp. - Portland OR

International Classification:

B22F 7/00

US Classification:

419 6, 419 36, 428548

Abstract:

Method for forming a unitary component from a plurality of powder metallurgy compacts. The method in some embodiments includes fluidizing first and second surfaces, wherein a first powder metallurgy compact defines the first surface and a second powder metallurgy compact defines the second surface. The method also includes joining the fluidizing first and second surfaces to form a bonded structure and thermally treating the bonded structure to fuse the first and second compacts into a unitary component.

US Patent:

20040138049, Jul 15, 2004

Filed:

Jan 10, 2003

Appl. No.:

10/340215

Inventors:

Mehrdad Yasrebi - Clackamas OR, US
David Sturgis - Boring OR, US
Laxmappa Hosamani - Lafayette CO, US
Brenda Schmidt - Aloha OR, US

Assignee:

PCC Structurals, Inc.

International Classification:

B29C065/00
B29D001/00
H05B006/00
C04B035/10

US Classification:

501/127000, 264/042000, 264/043000, 264/049000, 264/051000

Abstract:

The present disclosure describes improved compositions comprising an agitating agent, the compositions being particularly useful for powder injection molding. The disclosed method includes protocols for extracting binder materials from a powder injection molding prior to sintering. One embodiment of the disclosure includes compositions comprising a sinterable powder, a binder and a gas-forming agent. When induced to release a gas, the gas-forming agent provides internal agitation, which facilitates solvent-based binder extraction, resulting in a higher yield of extracted binder in reduced time. In one embodiment, the compositions include a carbonate, such as sodium carbonate, as the gas-forming agent. In this embodiment, the gas-forming agent is induced to form a gas during binder extraction by including an acid, such as citric acid, in the extraction solvent.

US Patent:

20060018780, Jan 26, 2006

Filed:

Jul 23, 2004

Appl. No.:

10/897643

Inventors:

Laxmappa Hosamani - Lafayette CO, US
Kenneth Endo - Boulder CO, US
Andrew Meschke - Loveland CO, US
David Harmon - Cincinnati OH, US
Saul Encinia - La Salle CO, US
Jeffrey Davenport - Mead CO, US
Emil Sokol - Longmont CO, US

International Classification:

B22F 5/12

US Classification:

419024000, 075252000

Abstract:

A method for producing wires, such as welding or hardfacing wires, made of superalloys and other metals. In a disclosed embodiment, the method includes forming a green-state wire from a feedstock comprising a metal powder and a binder, such as by extruding the feedstock through a die orifice, and sintering the wire to effect consolidation and densification of the wire.

US Patent:

20080075619, Mar 27, 2008

Filed:

Sep 27, 2006

Appl. No.:

11/528811

Inventors:

Laxmappa Hosamani - Longmont CO, US
Ken Endo - Boulder CO, US
Saul Encinia - La Salle CO, US
Emil Sokol - Longmont CO, US

International Classification:

B22F 3/10

US Classification:

419 36

Abstract:

Embodiments of a method for making molybdenum parts using metal injection molding are disclosed. In general, molybdenum powder is mixed or blended with a binder to form a feedstock, which is injection molded to form a green-state part. The green-state part is then sintered, such as by heating the part in a furnace for a predetermined period of time to effect consolidation and densification of the part. Desirably, the green-state part can be debound to remove at least a portion of the binder prior to sintering. In exemplary embodiments, sintering produces the final molybdenum article, and therefore the process does not require, but optionally may include, further processing of the sintered part, such as machining, cold-working, and/or hot-working.

US Patent:

55775470, Nov 26, 1996

Filed:

Apr 28, 1994

Appl. No.:

8/236216

Inventors:

Laxmappa Hosamani - Beaverton OR

Assignee:

Precision Castparts Corp. - Portland OR

International Classification:

B22D 2704

US Classification:

164122

Abstract:

A method for casting long thin metal articles is described. A particular embodiment is directed to the casting of seals that are used in the low pressure turbine section of a gas turbine engine. The method first involves forming a mold, and then preheating the mold so that the temperature towards the upper portion of the mold is close to the liquidus temperature of the metal composition being cast. The temperature of the bottom portion of the mold is below the solidus temperature of the metal alloy composition. After the metal is poured into the mold cavity, the mold heating system preferably is moved at a selected rate so that the portion of the mold being heated by the furnace is slowly decreased. Withdrawal rates slower than about 30 inches per hour produce satisfactory casting results.

US Patent:

56186339, Apr 8, 1997

Filed:

Jul 12, 1994

Appl. No.:

8/274171

Inventors:

Roger A. Swanson - Gladstone OR
Terry M. Nelson - West Linn OR
James R. Barrett - Milwaukie OR
Laxmappa Hosamani - Beaverton OR

Assignee:

Precision Castparts Corporation - Portland OR

International Classification:

B32B 312
E04C 230

US Classification:

428593

Abstract:

A metal article, at least a portion of which has a honeycomb structure, is described. The article was produced by an investment casting process. The metal casting comprises a base and plural walls which form a honeycomb structure that project outwardly in a first direction from at least a portion of the base. The base typically has a thickness of about 5 mm or less. The honeycomb structure may be defined by plural cells having geometric shapes. For instance, plural interconnected regular polygons, such as plural interconnected pentagons or hexagons, plural irregular interconnected polygons, or plural regular and irregular interconnected polygons may be used. The maximum distance between any two points on the periphery of the cell and passing through the interior space defined by the geometric shape is about 40 mm. The walls of the casting may have a wall thickness of from about 0. 3 mm to about 3.