Low temperature process for evaporative pattern casting

Details Low temperature process for evaporative pattern casting Low temperature process for evaporative pattern casting

1992-01-31

1993-04-20

Lin, Kuang Y.

Metal founding

Process

Shaping a forming surface

164 34, B22C 904

Patent

active

052033988

ABSTRACT:
A method is disclosed for the casting of metals by the use of a consumable or vaporizable pattern. In this method, a foamed pattern of a desired part is first formed. The pattern is then dipped into a ceramic slurry and the slurry dried in order to form a shell containing the foamed pattern. A bed of a particulate medium heated to a temperature of from 700.degree. to 1000.degree. F. is formed around the ceramic shell to cause the pattern to vaporize without burning and form a mold. A molten metal is then introduced into the mold, solidified and removed from the mold to form a casting. An inert atmosphere can be provided over the bed of heated particulate medium during the vaporization of the pattern to help suppress the burning of the vaporized pattern.

REFERENCES:
patent: 3572417 (1971-03-01), Wismer
patent: 4115504 (1978-09-01), Dewitte et al.
patent: 4640728 (1987-02-01), Martin et al.
patent: 4995443 (1991-02-01), Easwaran

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