B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
22/51
B22D 11/00 (2006.01) B22D 11/16 (2006.01)
Patent
CA 1250128
Abstract of the Invention A method and system for continuously or semicontinuously casting a composite metal article, such as a structurally com- posite ingot or the like, wherein one of the principal struc- tural components of the ingot comprises an aluminum-lithium alloy. During such casting by a D.C. (direct chill) conven- tional tubular mold or electromagnetic process, the aluminum- lithium structural component of a structurally composite ingot is encircled or peripherally encased by a further outer metal cladding component that can be cast simultaneously with the aluminum-lithium component such as another outer aluminous alloy from which lithium is absent as a constituent or impurity, although it may be present and tolerated as a trace element. In this arrangement the aluminum-lithium structural component is prevented during casting from coming into direct contact with the chilling coolant, normally water, with which lithium can react violently. Only the outer aluminous alloy envelope is subjected to the direct contact of a liquid coolant whereby as it solidifies, this outer envelope or peripheral sheath acts as an impervious secondary mold for and protects the inner aluminum-lithium alloy structural component which is then directly controllably chilled and solidified.
492191
Kaiser Aluminum & Chemical Corporation
Osler Hoskin & Harcourt Llp
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