Method and product for protecting molten magnesium

Details Method and product for protecting molten magnesium Method and product for protecting molten magnesium

1977-02-07

1978-05-16

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 96, C22B 2620

Patent

active

040896781

ABSTRACT:
An improved process and product for supplying a protective atmosphere of carbon dioxide plus a minor percentage of sulfur hexafluoride (CO.sub.2 /SF.sub.6) by means of a solid agent consisting of solidified CO.sub.2 and SF.sub.6 which by sublimation in the presence of molten magnesium and its alloys provides a protective atmosphere of desired composition. This solid agent is used for maintaining a protective atmosphere within a covered vessel containing molten magnesium or its alloys. It is also used for purging a crucible and for flushing the air from a mold cavity prior to the pouring of the molten metal. The amount and the composition of the solid agent can be adjusted to provide the desired composition of protective atmosphere for a wide variety of situations involving molten magnesium.

REFERENCES:
patent: 2008731 (1935-07-01), Stroup
patent: 3400752 (1968-09-01), Unsworth
Couling & Burrier, "First Interim Report on Additional Research on Fluxless Melting of Magnesium," Jul. 30, 1976 (Battelle).

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