Self-destructive core mold materials for metal alloys

Details Self-destructive core mold materials for metal alloys Self-destructive core mold materials for metal alloys

1976-08-09

1977-08-23

Shore, Ronald J.

Metal founding

Process

Shaping liquid metal against a forming surface

164 41, 164 66, 164132, 164138, 249134, B22D 2300, B22C 100, B22D 2900

Patent

active

040433811

ABSTRACT:
In the casting of metal alloys to form hollow articles, a mold of a desired shape containing a core material fabricated to a desired configuration from a silicon yttrium or silicon lanthanide oxynitride is filled with a molten metal alloy while maintaining the mold under a vacuum or under a blanket of an inert gas after which the mold is allowed to cool slowly to room temperature. The casted metal alloy with the core material exposed at one end is removed from the mold and heated under ambient conditions, thereby causing the silicon yttrium or silicon lanthanide oxynitride to oxidize with a large volume expansion and a concomitant catastrophic failure of the core material. The broken pieces of core material are removed from the casting which has a smooth inner surface, an indication that no chemical reactions have occurred between the alloy and the core material.

REFERENCES:
patent: 2345211 (1944-03-01), Neiman
patent: 3311488 (1967-03-01), Seufert et al.
patent: 3422880 (1969-01-01), Brown et al.

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