Stock material or miscellaneous articles – Composite – Of natural rubber
Reexamination Certificate
1999-04-28
2001-07-17
Cain, Edward J. (Department: 1714)
Stock material or miscellaneous articles
Composite
Of natural rubber
C428S292100
Reexamination Certificate
active
06261699
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates generally to the design and fabrication of a composite material system comprising soft magnetic alloys and high strength fibers. More particularly, the present invention has one form defined by a reinforced composite high-strength iron cobalt material system. Although the present invention was developed for use in gas turbine engines, certain applications may be outside this field.
It is well known that a gas turbine engine integrates a compressor and a turbine having components that rotate at extremely high speeds in a high temperature environment. One component is a rotor disk that carries a plurality of airfoils utilized to influence the gaseous flow within the engine. The rotating components typically cooperate with a rotatable shaft and are supported by radial bearings and a thrust bearing that must withstand significant dynamic and static loads within a hostile environment. During operation of the gas turbine engine, the bearings are subjected to forces including: shock loads, such as from landings; maneuver loads, such as associated with sudden change in direction; and, centrifugal loads attendant with the mass of the rotating components.
The desire to increase efficiency and power output from gas turbine engines has caused many engine designers to consider the application of magnetic bearings for supporting the rotor and rotatable shaft. The integration of magnetic bearings into an engine will enable the rotor and rotatable shaft to be supported by magnetic forces, eliminate frictional forces, eliminate mechanical wear and allow the removal of the lubrication system.
Magnetic thrust bearings include a magnetic flux field and a rotatable thrust disk that is acted upon by the magnetic flux field. The application of magnetic thrust bearings in flight weight gas turbine engines require compactactness of bearing design, which ultimately equates to lighter weight. Many prior designers of gas turbine engines have utilized material systems for the rotating thrust disk that experience a loss of mechanical properties at elevated temperatures. This loss of mechanical properties limits the maximum rotational speed that the thrust disk can be operated at, thereby effectively limiting the maximum rotational speed of the engine.
Heretofore, there has been a need for an improved magnetic material system. The present invention satisfies this need in a novel and unobvious way.
SUMMARY OF THE INVENTION
One form of the present invention contemplates a magnetic metallic matrix composite structure.
Another form of the present invention contemplates a magnetically responsive iron-cobalt material and a plurality of high strength elongated members that have been consolidated by a pressure and thermal cycle.
One aspect of the present invention contemplates a composite material, comprising: an iron based soft magnetic alloy; and at least one high strength fiber arranged within the magnetic alloy, and wherein the composite material has a tensile strength greater than the magnetic alloy material.
Another aspect of the present invention contemplates a fabricated composite structure, comprising: an iron-cobalt magnetic alloy material; and a plurality of spaced continuous high strength fibers positioned within and consolidated with the magnetic alloy so that the fabricated structure has an increased strength relative to the magnetic alloy.
Yet another aspect of the present invention contemplates a composite material, comprising: an iron-cobalt soft magnetic alloy material; and at least one tungsten wire within and consolidated with the magnetic alloy, and wherein the composite material has a tensile strength greater than the tensile strength of the magnetic alloy.
One object of the present invention is to provide a unique reinforced iron-cobalt composite material system.
Related objects and advantages of the present invention will be apparent from the following description.
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Chatterjee Amit
Ress, Jr. Robert Anthony
Allison Advanced Development Company
Cain Edward J.
Woodard Emhardt Naughton Moriarty & McNett
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