Compositions: coating or plastic – Coating or plastic compositions – Molds and mold coating compositions
Patent
1996-05-13
1998-06-16
Marcheschi, Michael
Compositions: coating or plastic
Coating or plastic compositions
Molds and mold coating compositions
106 3822, 106 3827, 164517, 164518, 164519, 164525, 164529, B22C 106, B22C 118, B28B 728, B28B 734
Patent
active
057663297
ABSTRACT:
A calcia mold facecoat is applied to a mold for casting parts composed of reactive metals such as titanium and titanium aluminide. The facecoat is composed of a calcium carbonate based slurry comprising a dense grain calcium carbonate powder and an aqueous based binder. It is applied to a wax or plastic pattern used in the lost wax process for fabricating a casting shell. The mold is built using multiple dipping of alumina-silicate slurries, and then fired at high temperatures in an oxygen rich environment. The metal part is cast before the fired mold can cool below about 800.degree. C. Organometallic based slurry binders are avoided and significant cost savings are realized owing to the benign nature of the aqueous based suspensions with respect to the environment.
REFERENCES:
patent: 4108931 (1978-08-01), Ogden
patent: 4703806 (1987-11-01), Lassow et al.
patent: 4710481 (1987-12-01), Degawa et al.
Barry Eoin Joseph
Fanelli Anthony Joseph
LaSalle Jerry Capriotti
Snow Brian Jeffrey
Allied-Signal Inc.
Fischer Felix L.
Marcheschi Michael
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