Method for cavityless casting employing a dual layer pattern coa

Details Method for cavityless casting employing a dual layer pattern coa Method for cavityless casting employing a dual layer pattern coa

1975-08-29

1977-03-08

Lazarus, Richard B.

Metal founding

Process

Shaping a forming surface

B22C 902

Patent

active

040107914

ABSTRACT:
A pattern destructible on contact with a molten metal charge is given a composite coating consisting of a highly tacky viscous adhesive substantially devoid of solids and single particle thickness layer collection of ultra-fine refractory particles (carbon facing sand) aligned on the surface of said adhesive. The adhesive volatilizes on contact with the casting charge while the refractory particles remain unaffected. An ultra-smooth cast surface is produced without macro crevices inherent in the surface of a destructible pattern and the mold sand is reusable without contamination by a high portion of burned sand.

REFERENCES:
patent: 3426834 (1969-02-01), Jacobs et al.

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