Ohio University

Brazeway, Inc.

General Cable Technologies Corporation

Frank Frederick Kraft

Keerti Sahithi Kappagantula

Sathish Kumar Ranganathan

Shenjia Zhang

Henry R McCarbery

Dave W Skrzypchak

Matthew M Guzowski

Jared Rich

A method of forming a metal-graphene composite includes coating metal components () with graphene () to form graphene-coated metal components, combining a plurality of the graphene-coated metal components to form a precursor workpiece (), and working the precursor workpiece () into a bulk form () to form the metal-graphene composite. A metal-graphene composite includes graphene () in a metal matrix wherein the graphene () is single-atomic layer or multi-layer graphene () distributed throughout the metal matrix and primarily (but not exclusively) oriented with a plane horizontal to an axial direction of the metal-graphene composite.

Ultraconductive metal composite forms and the synthesis thereof

Cables including conductors formed form ultra-conductive copper wires which have a lower temperature coefficient of resistance are disclosed. Methods of making the cables including conductors with ultra-conductive copper wires are further disclosed.

Cables exhibiting increased ampacity due to lower temperature coefficient of resistance

A hot extrusion die tool and a method of making the hot extrusion die tool are provided. The hot extrusion die tool includes a die tool component including a nickel-based super alloy; and a wear resistant coating deposited on the die tooling component. The method of making the hot extrusion die tool includes coating at least one portion of an extrusion die tool component comprising a nickel-based super alloy with a wear resistant coating at a high temperature; and hardening the extrusion die tool component and the at least one coated portion.

Hot extrusion die tool and method of making same

An apparatus and method are provided for extruding a micro-channel tube () from a non-aluminum metal or alloy such as copper. The micro-channel tube is formed by simultaneously extruding two rectangular shaped billets () to form a top portion of the micro-channel tube and a bottom portion of the micro-channel tube in parallel. The top and bottom portions are then joined during the extrusion process (e.g., within a die assembly) to form the micro-channel tube ().

Micro-channel tubes and apparatus and method for forming micro-channel tubes

A heat exchanger tube of the present invention has first and second surfaces with a longitudinal length and a lateral width. At least one of the surfaces has a plurality of striae that extend along a portion of the width of the tube. The tube has at least one passageway that allows a fluid to flow therethrough. The striae minimize and/or prevent unwanted flow of molten braze alloy along die-lines in the tube formed as part of the extruding process. The striae can be formed in the tube by rollers having projections that extend radially outward. The projections form the striae in the tube as the tube passes along the outer surface of the roller. The striae can be advantageously formed in the tube as part of the overall extruding process or subsequent to the extruding of the tube during the sizing process.

Braze alloy flow-barrier

This invention is a process for making micro-multiport tubing for use in heat exchangers. The tubing is a flat body with a row of side-by-side passageways, which are separated by upright webs. Processing of this tubing involves extrusion, a straightening and cutting operation, a rolling step to reduce the thickness of the flat body and to obtain ultra small voids, assembly and furnace brazing of the heat exchanger. This invention improves the grain size of the metal in the tubing and also improves the metallurgical strength of the tubing. There is at least 10 percent change in material thickness. The strain is concentrated at the center of the web and results in at least enough cold work to produce fine recrystallized grains during the brazing thermal cycle. The amount of grain growth is controlled and the improvement in the metallurgical strength is achieved.

Multivoid heat exchanger tubing with ultra small voids and method for making the tubing

This invention is a process for making micro-multiport tubing for use in automobile air conditioner heat exchangers. The tubing is a flat body with a row of side-by-side passageways, which are separated by upright webs. Processing of this tubing involves extrusion, a straightening and cutting operation, assembly and furnace brazing of the condenser. This invention improves the grain size of the metal in the tubing and also improves the metallurgical strength of the tubing. Ports are formed in the tubing during extrusion. These ports are separated by webs and the webs are extruded so that they have a reduced thickness at their centers. In response to successive cold working of the body, the webs are changed in shape to a more uniform thickness state. Stated other wise, in this invention, the webs are initially of hour glass shape such that when there is five percent change in material thickness, the strain is concentrated at the center of the web and results in at least fifteen percent cold work. With fifteen percent cold work or more, the amount of grain growth is controlled and the improvement in the metallurgical strength is achieved.

Growing community of inventors

Albany, OH, United States of America

Frank Frederick Kraft