Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1992-09-14
1993-05-04
Brown, David H.
Metal founding
Process
Shaping liquid metal against a forming surface
B22D 2702
Patent
active
H00011797
ABSTRACT:
A method of casting high melting point metal such as refractory metals into ngots to provide substantially improved strength and density. A quantity of high melting point metal is placed in an arc area of a furnace having a "T" shaped vacuum chamber with a pair of opposing electrodes which generate an arc to cause droplets of the metal to melt from the heat thereby generated. The droplets fall into a mold positioned to receive the droplets and shaped to form the desired ingot. The method includes an additional step of further heating the droplets as they fall into the mold with a plasma arc gun mounted inside the furnace. The gun is directed to impinge its heat torch to control the rate of solidification such that a small pool of the liquid phase is maintained on the ingot. The last step comprises solidifying the molten metal in the ingot by controlling the plasma arc gun and the heat generated from it.
Batra Ravi
Keown, decreased William P.
Brown David H.
Goldberg Edward
Lane Anthony T.
Sachs Michael
The United States of America as represented by the Secretary of
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