Method of forming foundry moulds

Details Method of forming foundry moulds Method of forming foundry moulds

1976-08-20

1977-04-26

Shore, Ronald J.

Metal founding

Process

Shaping a forming surface

B22C 904

Patent

active

040195589

ABSTRACT:
A method of forming investment casting shell moulds by alternately dip coating a mould former in slurries of refractory particles and stucco coating the former, wherein the slurries contain a binder and a thixotropic modifier to reduce or eliminate the drying period between dip coats. The initial slurry has a suspended solids content in the range 30% to 50% by volume of the total volume of the slurry to provide an initial coating on the former which will not be penetrated by the relatively coarser stucco particles, while the other slurries have a suspended solids content in the range 20 to 40% by volume of the total volume of the slurry to coat the previously applied stucco coating. The thixotropic modifier is at least one substance selected from aluminum alkoxides, aluminum aryloxides, clays, carbon blacks, fumed silicas, fumed alumina, fumed titanium oxide, fumed zirconium oxide, fumed hafnium oxide and fumed chromium oxide.

REFERENCES:
patent: 2806269 (1957-09-01), Dunlox
patent: 3005244 (1961-10-01), Erdle et al.
patent: 3077648 (1963-02-01), Sutherland
patent: 3396775 (1968-08-01), Scott
patent: 3748156 (1973-07-01), Moore, Jr.
patent: 3894572 (1975-07-01), Moore, Jr.

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