Coating for gasifiable foam patterns

Details Coating for gasifiable foam patterns Coating for gasifiable foam patterns

1976-12-13

1978-06-06

Van Balen, William J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

428143, 428315, 428323, 428354, 428355, B32B 326, B32B 516

Patent

active

040937704

ABSTRACT:
A pattern destructible on contact with a molten metal charge is given a composite coating consisting of a (1) highly tacky viscous adhesive substantially devoid of solids and having a low gas content, (2) a collection of ultra-fine refractory paticles (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: 3679539 (1972-07-01), Gossens
patent: 3687800 (1972-08-01), Scheppers
patent: 3700516 (1972-10-01), Sullivan
patent: 3800016 (1974-03-01), Roberts
patent: 3900650 (1975-08-01), Sedore

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