Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1988-05-02
1989-03-07
Stallard, Wayland
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 05C, 264 13, 425 6, B22F 908
Patent
active
048102881
ABSTRACT:
An apparatus and method for forming essentially contaminant free metal powders of varying particle diameter by utilizing a separate gas percolation chamber for admitting a separate clean variable pressure percolating gas into a molten metal passing through a transfer tube, forming a metal froth which is sprayed into a reduced pressure collection chamber. The metal froth then disintegrates providing a finely divided powder which is cooled in the suspension state and collected. By utilizing a separate percolation chamber for independently pressurizing the metal froth, impurities are reduced and froth characteristics and controllably modifiable thereby providing essentially contaminant free metal powder of varying particle diameter. In addition, pressure equalization means are disclosed for overcoming pressure imbalances on start-up. A valve filter combination provides for free gas flow between the percolation chamber and melting chamber, preventing overpressured molten metal from blocking the precolation holes during the initial metal froth formation, thereby increasing powder yields.
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Baszczuk Christopher M.
Quimby Bruce A.
Rashid James M.
Stallard Wayland
United Technologies Corporation
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