Walter F Gustafson, 805783 Saddlebag Lake Rd, Lake Wales, FL 33898

2001000, Jun 7, 2001

Dec 15, 2000

09/738447

Donald Schofield - Columbia CT, US
Mark Ring - West Hartford CT, US
John Lennon - Middletown CT, US
Walter Gustafson - Manchester CT, US

United Technologies Corporation

B22C017/10
B22D027/15

164/061000, 164/113000

An apparatus and method for die casting includes a multi-part, reusable die having at least two die sections defining a die cavity for receiving molten material to be cast. The die sections are moveable relative to one another. Each die section defines a portion of the die cavity and the die sections define the die cavity when positioned in engagement with one another. A melting unit of the apparatus melts the material, and a shot sleeve receives molten material from the melting unit and is in fluid communication with the die. A plunger unit urges material from the sleeve into the die. The apparatus further includes a reduced pressure means, e.g., a vacuum unit, coupled to at least the die for providing a reduced pressure to at least the die cavity. A sealing mechanism of the apparatus is coupled to the die. The sealing mechanism engages the die sections to define an evacuation cavity, including at least the die cavity, when the die sections are brought into close proximity with one another, thereby enabling evacuation of the die while the die sections are in spaced relation and more thoroughly and completely evacuating the die cavity.

2002000, Jan 17, 2002

Dec 7, 1999

09/456972

JOHN J. SCHIRRA - ELLINGTON CT, US
RALPH GIUGNO - IVORYTON CT, US
WALTER FREDERICK GUSTAFSON - MANCHESTER CT, US
JOHN JOSEPH MARCIN JR. - MARLBOROUGH CT, US
JEFFERY WILLIAM SAMUELSON - JUPITER FL, US
DELWYN EARLE NORTON - MANCHESTER CT, US

C22C019/05

148/428000, 148/410000, 420/448000

A die cast article such is composed of nickel base superaloy IN 718 is disclosed. The microstructure is characterized by an absence of flowlines and includes a fine average grain size, e.g., ASTM 3 or smaller. Exemplary articles include gas turbine engine components, such as blades, vanes, cases and seals.

4851188, Jul 25, 1989

Dec 21, 1987

7/135956

Robert P. Schaefer - East Hartford CT
Walter F. Gustafson - Manchester CT
David A. Rutz - Glastonbury CT
Kenneth E. Taylor - Longmeadow MA

United Technologies Corporation - Hartford CT

B22F 700

419 19

An abrasive, wear resistant layer is applied to the tip surface of a superalloy gas turbine blade by high temperature sintering operation which produces a high strength bond between the layer and the blade, minimizes gamma prime phase growth, and prevents recrystallization in the blade. Important features of the invention include removing plastic strain damage from the tip surface prior to the sintering operation, using induction heating techniques to sinter a layer of metal powder particles and ceramic particulates to the blade tip surface, and shielding the airfoil and root portion of the blade from the radiant heating source during the sintering operation while at the same time, conductively removing heat from the blade.