Method for preparing a fiber reinforced metal matrix using microscopic fibers
AssigneeSilag, Inc.
InventorAmarnath P. Divecha
Life of this patent
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Abstract
Microscopic fibers are mixed with a metal powder to provide a nonuniform mixture with randomly oriented fibers having metal particles adhered thereto. This mixture is extruded at room temperature at least three times, and is then placed in a die cavity and subjected to a first pressure at room temperature. While adding no additional pressure, the die cavity is heated to bring the mixture to a temperature above the solidus of the metal powder, and the volume of the die cavity is decreased to at least the theoretical volume necessary to receive the mixture if the mixture included no voids. The die cavity is then cooled and the resultant billet ejected therefrom.
Claims11
A process of preparing a fiber-reinforced metal composite which includes dry mixing a metal powder with ceramic fibers to obtain a substantially uniform dispersion of fibers throughout a dry metal-fiber mixture, cold pressing the metal powder-fiber mixture so formed at a first predetermined pressure, heating the pressed metal powder-fiber mixture to a temperature sufficient to permit further densification of the metal powder-fiber mixture, hot pressing the mixture to product further densification thereof, and cooling the resultant composite.
Dependencies are inferred from the claim text.