Aluminum Company of America

M K Premkumar

C Edward Eckert

Ralph R Sawtell

Men Glenn Chu

David I Yun

Lawrence W Cisko

James R Fields

Thomas R Hornack

Gerald D Scott

Mohammad A Zaidi

Richard A Manzini

Frankie E Phelps

Marshall A Klingensmith

William G Truckner

Thomas J Kasun

Thomas J Rodjom

Robert C Wallace

George C Full

Jerri F McMichael

Gary W Malette

James A DerKacy

Janel M Miller

A method of fabricating MMCs having high thermal conductivity coupled with coefficient of thermal expansion (CTE) values which approximates the CTE of ceramics and semi-conductor materials typically used in electronic packaging. The method comprises preparing a formed agglomeration of powder particles (preform); partially sintering the preform; placing the partially sintered preform into a forming chamber; infiltrating the preform with liquid-phase metal; and allowing the liquid-phase metal to solidify and form an MMC around and through the preform. In a preferred embodiment, the preform is constructed from silicon carbide, and the metal matrix is an aluminum-silicon alloy.

Incorporating partially sintered preforms in metal matrix composites

A method of fabricating a metal matrix composite containing electrically isolated areas and the MMC formed from the method. The method comprises: (a) providing a liquid pool of unreinforced aluminum alloy; (b) infiltrating the unreinforced aluminum alloy into a stack comprising upper and lower porous preforms and an electrical insulator material placed between the preforms; (c) solidifying the liquid-phase metal to form a metal matrix composite product that completely surrounds the stack; and (d) forming at least one groove in the solidified metal, the groove extending downward to at least one insulating substrate so as to electrically isolate at least one region on the surface of the metal matrix composite.

Fabricating metal matrix composites containing electrical insulators

The die casting machine includes a trough containing a supply of molten metal and a feed tube extending into the supply of molten metal in the trough. A flow of molten metal is maintained in the trough past the feed tube independent of the transfer of molten metal through the feed tube. The die casting machine further includes a filtering system.

Die-casting process and equipment

This invention is characterized by working which improves metal formability. This is contrary to the usual result of working metals, where formability decreases during working.

Metallurgical products improved by deformation processing

Wire of co-drawn composite of conductor core and matrix is provided, for instance in the form of high purity aluminum conductor and Al-Fe-Ce alloy matrix, suitable for use for electrical conduction at cryogenic temperatures. Included are extrusion and drawing processes enabling successful production.

Drawn conductors for cryogenic applications

Metallurgical products improved by deformation processing and method

This invention provides improved casting processes, equipment, and products. The invention is especially advantageous for die casting.

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Monroeville, PA, United States of America

M K Premkumar