Halide treatment for aluminum lost foam casting process

Details Halide treatment for aluminum lost foam casting process Halide treatment for aluminum lost foam casting process

1987-02-02

1987-12-08

Lin, Kuang Y.

Metal founding

Process

Shaping a forming surface

164 45, 164 551, B22C 904, B22D 2700

Patent

active

047112883

ABSTRACT:
Casting aluminum by a lost foam process is improved by treating the metal during pattern replacement with a halide salt flux to inhibit formation of oxide fold defects. A preferred flux comprises a mixture of alkaline metal chloride compounds and includes an aluminum fluoride salt, such as sodium aluminum fluoride. In a preferred embodiment, the flux is incorporated into a polystyrene pattern prior to embedding the pattern in a sand mold and becomes dispersed on a front of the cast metal as the front progressively decomposes the pattern.

REFERENCES:
patent: 4281705 (1981-08-01), Jeney

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