Composite casting for adding lithium to molten alloys
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United States of America Patent
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Jun 4, 1991
Issued Date -
N/A
app pub date -
Jan 2, 1990
filing date -
Aug 20, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method for the charging and controlled addition of pre-alloys to molten alloys of metals reactive and nonreactive at room temperature which are held in a crucible. To permit pre-alloys with a high percentage of reactive metal to be handled more easily, a casting is produced from the reactive and nonreactive metals by a casting process followed by solification. This casting is nonreactive at its surface at room temperature and its average content of reactive metal is equal to or greater than the reactive metal content in the crucible. Such castings are added to the crucible according to the need for the reactive metal. In an especially advantageous manner, a casting produced in a casting mold in a nonreactive atmosphere has at least at its surface such a content of nonreactive metal that it is stable at room temperature.
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