Abstract: A conductor material includes a metal matrix, and a first carbon allotrope distributed within the metal matrix, the first carbon allotrope being aligned with a direction of electric current flow through a length of the metal matrix. The metal matrix and the first carbon allotrope have an electrical interfacial coherency.

Abstract: 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.

Abstract: 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.

Abstract: An apparatus and method are provided for extruding a micro-channel tube (402) from a non-aluminum metal or alloy such as copper. The micro-channel tube is formed by simultaneously extruding two rectangular shaped billets (404; 406) 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 (402).

Abstract: An apparatus and method are provided for extruding a micro-channel tube (402) from a non-aluminum metal or alloy such as copper. The micro-channel tube is formed by simultaneously extruding two rectangular shaped billets (404; 406) 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 (402).

Abstract: 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.

Abstract: 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.

Abstract: This invention is a process for making improved micro-multiport tubing for use in heat exchangers. A multivoid heat exchanger tube is extruded from aluminum alloy billet. The alloy is a composition of cooperative elements which act with the aluminum to prevent recrystallization and grain growth which result in the necessary strength and duality of characteristics in the tubes. The composition of the alloy that is added to aluminum is some or all of the following: silicon, iron, copper, magnesium, manganese, zinc and titanium. The cold work during processing of the heat exchanger is limited to further retain the small grains.

Abstract: A method of manufacturing micro-multi-port tubing including actuating a hydraulic press to apply a force to a billet to extrude material through a die opening. The die opening defines at least two distinct segments to produce a single, unitary, continuous micro-multi-port extrusion strand having at least two distinct segments being interconnected by a web section. The method further includes separating the single, unitary, continuous micro-multi-port strand to substantially remove and/or reshape the web section to define at least two separate and independent micro-multi-port tubing segments from a single extrusion strand.

Abstract: 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.

Abstract: 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.