Process for pressure infiltration casting and fusion bonding of

Details Process for pressure infiltration casting and fusion bonding of Process for pressure infiltration casting and fusion bonding of

1996-02-29

1997-09-09

Lin, Kuang Y.

Metal founding

Process

Shaping liquid metal against a forming surface

164105, B22D 1914

Patent

active

056646160

ABSTRACT:
A process for pressure infiltration casting of a metal matrix composite in a metallic article is disclosed. A metallic base component is formed. A portion of the exterior surface of the metallic base component is adapted for mating with a corresponding exterior surface of a preform at an interface. A preform having interconnecting porosity is formed. An infiltration metal for forming a molten infiltrant charge and having a melting temperature "y" at least equal to or greater than the melting temperature "x" of the base metal is selected. A first mold including the base component is provided and preheated to a temperature in the range of (x-200).degree.F. to (x-50).degree.F. A second mold including the preform and the infiltration metal is provided and positioned adjacent the first mold. The second mold, preform and infiltration metal are heated to a temperature in the range of about (y-200).degree.F. to about (y+200).degree.F. The preform is evacuated and a vacuum is isolated in the preform. The molten infiltrant charge is pressurized at a pressure sufficient to infiltrate the molten charge into the interconnecting porosity of the preform and form an infiltrated preform. The infiltration metal is contacted with the base metal at the interface and fusion-bonding of the infiltration metal with the base metal is caused. The metallic base is cooled to cause directional solidification of the infiltration metal.

REFERENCES:
patent: 5004034 (1991-04-01), Park et al.
patent: 5188164 (1993-02-01), Kantner et al.
patent: 5322109 (1994-06-01), Cornie

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