Plastic and nonmetallic article shaping or treating: processes – Formation of solid particulate material directly from molten... – By impinging plural liquid masses
Patent
1978-11-20
1981-11-03
Czaja, Donald E.
Plastic and nonmetallic article shaping or treating: processes
Formation of solid particulate material directly from molten...
By impinging plural liquid masses
264 13, 264 14, B01J 206
Patent
active
042985536
ABSTRACT:
A method is disclosed for producing high purity metal powders having an irregular and angular shape and a very low oxygen content (less than 0.25% oxygen in iron and steel powders). The invention utilizes a multiple stage high pressure liquid atomization procedure for converting the molten metal to angular particulate form, and provides for the very rapid subsequent cooling of the hot particle under conditions of high pressure sprays and violent turbulence of the powder particles in the liquid that minimize the formation of oxide impurities on the particles surface. High pressure atomization to produce angular and irregular particles tends to create an oxidizing environment because of the mixture of hot particles and liquid. By rapidly quenching the particles immediately after formation, in a quenching environment that creates a violently turbulent condition at the surface of the metal particles, the formation of vapor or steam films is minimized and more rapid heat transfer from the particles to the cooling medium is realized. Special procedures are followed to exlude air in the atomizing chamber prior to, during and after atomization of the molten metal. The disclosed method represents an extension and an improvement over the process of U.S. Pat. No. 3,646,176.
In the process of the invention, vacuum is created in the atomizing chamber, by the action of the high pressure sprays, and this has significant processing advantages. The tendency for this vacuum to draw water into the atomizing zone is effectively controlled by properly directing and confining the spray jets after issuance from the nozzles.
REFERENCES:
patent: 3334408 (1967-08-01), Ayers
patent: 3551532 (1970-12-01), Laird
Chemical Engineers Handbook, 4th ed., McGraw-Hill Book Co., New York, 1963, pp. 6-29 to 6-32.
Czaja Donald E.
Hall James R.
Metal Innovations, Inc.
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