Method of producing tablets formed by prealloys of...

Specialized metallurgical processes – compositions for use therei – Processes – Producing solid particulate free metal directly from liquid...

Reexamination Certificate

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Reexamination Certificate

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07033414

ABSTRACT:
A tablet formed by prealloys iron-aluminum produced from atomized powders to be used as additive element in aluminum alloys, is manufactured by the method having the steps of obtaining a metallic alloy by fusion of iron and aluminum with the iron and aluminum added in an electric arc or induction furnace, atomizing the melted alloy by transporting the melted alloy to an intermediary container with an opening as a metal flux controlled by a valve located in the opening for controlling and proportionating a continuous flux and supplying a jet of water under pressure when the liquid metal drains to provide atomization and to produce small droplets that cool in water, solidify and are deposited as a powder; reducing humidity of the powder; classifying the thusly produced material, and compacting a thin fraction of the material for obtaining tablets; a tablet.

REFERENCES:
patent: 3614000 (1971-10-01), Blythe
patent: 4171275 (1979-10-01), Merrill et al.
patent: 5090997 (1992-02-01), Birkenstock et al.
patent: 6383248 (2002-05-01), Taylor et al.
patent: 11/92893 (1999-04-01), None
ASM Handbook, vol. 7, Powder Metal Technologies and Applications, 1998, ASM International, p. 42.
Standard Test Procedure for Measuring the Dissolution of Aluminum Hardeners, The Alluminum Association, 1990, pp. 1-11.
Lee, Young et al: “Dissolution Mechanism for High Melting Point Transition Elements in Aluminum Melt.” Light Metals 2000, TMS, 2000.
Metals Handbook 8th Edition. vol. 8, p. 262.

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