Abstract: For the remelting of titanium or zirconium, the electroslag remelting method is used. To prevent any reaction of the melt with oxygen or nitrogen, the remelting is performed in an inert gas atmosphere. Fluorspar with an addition of calcium oxide is used as the slag forming substance. This calcium oxide dissolves in the fluorspar and reacts with oxygen, nitrogen and hydrogen in the titanium, so that the reactive metal is purified of these substances.
Type:
Grant
Filed:
August 4, 1992
Date of Patent:
August 10, 1993
Assignee:
Leybold Durferrit GmbH
Inventors:
Alok Choudhury, Norbert Ludwig, Harald Scholz
Abstract: In a vacuum heat treating oven operating with hydrogen under pressure as the cooling medium, especially for the quenching of greatly heated metal workpieces (5), a method is provided for the automatic control of the progress of the process and for monitoring safety of operation. The housing (4) of the heat treating oven is for this purpose connected to gas inlet lines (9 and 10), one for the admission of the cooling gas and one for the admission of the flushing gas (H.sub.2 and N.sub.
Type:
Grant
Filed:
October 7, 1991
Date of Patent:
July 6, 1993
Assignee:
Leybold Durferrit GmbH
Inventors:
Paul Heilmann, Peter Minarski, Friedrich Preisser
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