Direct chill casting of aluminum-lithium alloys under salt...

Details Direct chill casting of aluminum-lithium alloys under salt... Direct chill casting of aluminum-lithium alloys under salt...

B - Operations, Transporting

22

D

B22D 11/124 (2006.01) B22D 11/111 (2006.01)

Patent

CA 2158073

Casting aluminum-lithium based al- loys under a salt cover (25) involves forming a molten aluminum-lithium alloy, transfer- ring the molten aluminum-lithium alloy to a casting station (3), and direct chill casting the aluminum-lithium alloy, wherein a pro- tective molten salt cover (25) comprising a mixture of lithium chloride and potassium chloride is maintained over the aluminum- lithium alloy (23) during the casting process. Formation of the molten aluminum-lithium alloy includes alloying of lithium with alu- minum by adding lithium to the salt-covered molten aluminum in a melting vessel (1). The molten salt may be added to the ingot head during casting. A preferred salt mix- ture includes 35 to 90 mole % LiCl and 10 to 65 mole % KCl.

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