Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1984-03-05
1985-07-02
Stallard, W.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 05BA, B22F 900
Patent
active
045266115
ABSTRACT:
An improved process for producing superfines of metal is disclosed, which comprises reacting a metal halide containing gas with a reducing gas by causing to flow both the stream of a metal halide containing gas and the stream of a reducing gas concurrently but at different velocities so as to form an interfacial instability region in the reaction zone, and nuclei are formed in said instability region whereas said reaction zone is quenched (cooled) to inhibit the excessive growth of said nuclei. Application of a magnetic field to the reaction zone can enhance the degree of fineness and magnetic properties of the superfines thus produced.
REFERENCES:
patent: 2664352 (1953-12-01), Darner et al.
patent: 3955962 (1976-05-01), Dawihl et al.
patent: 4383852 (1983-05-01), Yohizawa
"Flame Structure", Chapter II, R. M. Fristrom and A. A. Westenberg, The Applied Physics Laboratory, The John Hopkins University, McGraw-Hill Book Company, 1965.
"Boundary Layer Theory", 7th Edition, Chapter XXIV, Hermann Schlichting (Translated by J. Kestin), McGraw-Hill, Inc., 1979.
"Formation of Fine Silicon Carbide Powders by a Vapor Phase Method", Y. Okabe, J. Hojo and A. Kato, Department of Applied Chemistry, Faculty of Engineering, Kyushu University, Journal of the Less-Common Metals, vol. 68, pp. 29-41, 1979.
"TiO.sub.2 Produced by Vapor-Phase Oxygenolysis of TiCl.sub.4 ", Y. Suyama and A. Kato, Department of Applied Chemistry, Faculty of Engineering, Kyusyu University, Journal of the American Ceramic Society, vol. 59, No. 3-4, pp. 146-149, 1976.
Arisawa Norisada
Hagimori Kenji
Imaizumi Hiroyuki
Maekawara Hideaki
Mieno Eiichirou
Stallard W.
Toho Zinc Co. Ltd.
Yoshizawa Akinori
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