Water soluble ceramic core for use in die casting, gravity and i

Details Water soluble ceramic core for use in die casting, gravity and i Water soluble ceramic core for use in die casting, gravity and i

1998-06-05

2000-02-15

Davis, Robert

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

106 382, 106 3823, 106 3851, 164522, 164525, 164369, 249 61, 501107, B22C 0116, B22C 0118

Patent

active

060247878

ABSTRACT:
A water-soluble ceramic core is prepared which can be advantageously used in the die casting, gravity casting, and investment casting of precision aluminum alloy objects. The ceramic core contains: (a) 60 to 70% by weight of alumina (A1.sub.2 O.sub.3) flour; (b) about 15 to 25 by weight of zircon (ZrSiO.sub.4) flour; (c) about 5 to 15 by weight of sodium hydrogen phosphate (Na.sub.2 HPO.sub.4); and (d) about 5 by weight of sugar. In preparing the ceramic core, sodium hydrogen phosphate and sugar are first dissolved in water to form a sodium hydrogen phosphate/sugar solution. Then alumina flour and zircon flour are added into the sodium hydrogen phosphate/sugar solution to form a slurry, which is caused to form a precursory ceramic core using an injection molding or slip casting process. After blow-drying the precursory ceramic core is calcined at temperatures between 70 and 800.degree. C. The ceramic core can be optionally immersed into a lacquer solution to impart a water-proof film on its surface, so as to allow it to withstand attacks from steam during autoclaving.

REFERENCES:
patent: 1531871 (1925-03-01), Nagel
patent: 3551365 (1970-12-01), Matalon
patent: 4391642 (1983-07-01), Stevenson et al.
patent: 4438804 (1984-03-01), Aiga et al.
patent: 4659526 (1987-04-01), Shimaguchi et al.
patent: 5147834 (1992-09-01), Banerjee
patent: 5743953 (1998-04-01), Twardowska et al.

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