Rapid plasma quenching for the production of ultrafine metal and ceramic powders |
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Authors: | Alan Donaldson Ronald A Cordes |
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Affiliation: | (1) Idaho Titanium Technologies, Inc., USA;(2) Plasma Quench Technologies, Inc., USA |
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Abstract: | The rapid plasma quench concept used to produce ultrafine titanium hydride, magnesium, and aluminum powders involves the thermal
dissociation of liquid reactants into gaseous components followed by rapid quenching of the products of the subject reaction
to prevent back reactions. For example, in the case of titanium hydride powder production, titanium tetrachloride dissociates
into titanium and chlorine atoms at 5,000 K. Expansion through a Delaval nozzle accelerates the gas to supersonic speed, cooling
it very rapidly at rates as high as 710 K/s. Injected hydrogen reacts with condensed titanium particles to form titanium hydride and with the chlorine to form hydrogen
chloride. Titanium powder has been produced at 20 kg/h in a continuous reactor. Costs are projected to be lower than the Kroll
process at a sufficiently large scale. Magnesium and aluminum production based upon the rapid plasma quench concept are also
discussed.
For more information, contact Alan Donaldson, Idaho Titanium Technologies, Inc., 101 Technology Drive, Idaho Falls, ID 83401;
(208) 522-9909; fax (208) 523-6685; e-mail al@aljeanie226.myrf.net. |
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