Method of making a composite casting

Details Method of making a composite casting Method of making a composite casting

1991-09-11

1993-11-23

Rosenbaum, Mark

Metal founding

Process

Shaping liquid metal against a forming surface

164 98, 164102, 164 761, 228176, 2282351, B22D 1902

Patent

active

052635309

ABSTRACT:
A method of making a composite casting wherein a casting mold is provided for receiving a melt and a preformed metallic or intermetallic insert is positioned in the mold cavity. The preformed insert includes a working portion for incorporation in the casting and gas seal-forming means located at a region of the insert at least outboard of the insert portion. A melt is introduced into the mold about the insert and is then solidified to provide a composite casting having the insert working portion disposed in the solidified melt and as-cast gas seal regions located outboard of the insert working portion in the casting. The casting is then subjected to elevated temperature and isostatic gas pressure conditions wherein the as-cast gas seal regions are effective to inhibit gas penetration between the insert working portion and the solidified melt therearound so as to permit formation of a sound, void-free metallurgical bond therebetween. The hot isostatically pressed casting can then be trimmed to remove, if desired, those outboard portions containing the gas seal regions, leaving a finished casting having the insert working portion metallurgically bonded therein in a sound, void-free manner.

REFERENCES:
patent: 1057713 (1913-04-01), Davies
patent: 2745437 (1956-05-01), Comstock
patent: 3819145 (1974-06-01), Huber et al.
patent: 4008052 (1977-02-01), Vishnevsky et al.
patent: 4572270 (1986-02-01), Funatani et al.
patent: 4592120 (1986-06-01), Egan et al.
patent: 4889177 (1989-12-01), Charbonnier et al.

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