Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1992-07-13
1994-03-15
Seidel, Richard K.
Metal founding
Process
Shaping liquid metal against a forming surface
164100, 164 98, B22D 1900
Patent
active
052939235
ABSTRACT:
A method is provided for forming a metallurgical bond between an aluminum-base insert and an aluminum-base casting material during a casting process, wherein the method entails wetting the oxide surface of the insert, coating the surface with a metallurgically compatible material, and raising the temperature of the insert to reduce the temperature gradient between the insert and the casting material. The insert is dipped into a molten zinc-base alloy which includes about 2 to about 10 weight percent aluminum. The zinc-base alloy coats the insert and remains on the surface of the insert until a molten casting material is introduced. As a result, the surface of the coated insert is nearly oxide-free. The aluminum content in the zinc-base alloy is preferably about 4 to about 6 weight percent of the zinc-base alloy. The zinc-base alloy also preferably contains between about 0.25 and 0.35 weight percent magnesium for the purpose of weakening the oxide film layer on the insert. As a result, both the zinc-base alloy and the casting material can more readily wet the surface of the insert to achieve a good metallurgical bond therebetween. The residual zinc-base alloy layer fuses to the surface of the insert and the casting material. The method of the invention is equally applicable to magnesium-base alloys and composites.
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Metals Handbook, Desk Edition, ASM Dec. 1988, pp. 11-6, 30-74, 30-75.
Beck et al., "The Kinetics of the Oxidation of Al in Oxygen at High Temperature", Corrosion Science, (1967) vol. 7, pp. 1 through 22.
Ritchie et al., "Oxidation of a Dilute Aluminum Magnesium Alloy", [Source is undecipherable] (1971) vol. 3, No. 1, pp. 91 through 101.
Hartman Domenica N. S.
Hartman Gary M.
Pelto Rex E.
Seidel Richard K.
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