Abstract
Spray forming is a near- net- shape fabrication technology in which a spray of finely atomized liquid droplets is deposited onto a suitably shaped substrate or pattern to produce a coherent solid. The technology offers unique opportunities for simplifying materials processing, often while substantially improving product quality. Spray forming is applicable to a wide range of metals and nonmetals and offers property improvements resulting from rapid solidification (e.g., refined microstructures, extended solid solubilities, and reduced segregation). Economic benefits result from process simplification and the elimination of unit operations. Researchers at the Idaho National Engineering Laboratory (INEL) are developing spray forming technology for producing near- net- shape solids and coatings of a variety of metals, polymers, and composite materials using de Laval nozzles. This article briefly describes the atomization behavior of liquid metals in linear de Laval nozzles and illustrates the versatility of the process by summarizing results from two spray forming programs. In one program, low-carbon steel strip >0.75 mm thick was produced; in the other, polymer membranes ∼5 μm thick were spray formed.
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References
Metals Handbook Desk Edition, H.E. Boyer and T.L. Gall, Ed., ASM International, 1989, p 6.35
A.H. Lefebvre,Atomization and Sprays, S. Tamburrino and M. Prescott, Ed, Hemisphere, 1989, p 10
R.E. Luna and W.A. Klikoff, Jr.,“On Aerodynamic Breakup of Liquid Drops,” Sandia Laboratory Report SC-RR-66-2716, June 1967
M. Pilch and C. A. Erdman, Use of Breakup Time Data and Velocity History Data to Predict the Maximum Size of Stable Fragments for Ac- celeration-Induced Breakup of a Liquid Drop,Int. J. Multiphase Flow, Vol 13 (No. 6), 1987, p 741–757
F.C. Haas, Stability of Droplets Suddenly Exposed to a High Velocity Gas Stream,A.I. Ch.E. Journal, Vol 10, 1964, p 920–924
J.F. Key, R.A. Berry, D.E. Clark, J.R. Fincke, and K M. McHugh,“De- velopment of a Spray-Forming Process for Steel,” Final Program Re- port, December 1991
J.O. Hinze, Fundamentals of the Hydrodynamic Mechanism of Split- ting in Dispersion Processes,A.I. Ch.E. Journal, Vol 1 (No. 3), 1955, p 289–295
R.R. McCaffrey and D.G. Cummings,Separation Sci. Technol, Vol 23 (No. 12,13), 1988, p 1627–1643
S.A. Leeper, D.H. Stevenson, P.Y.-C. Chiu, S.J. Priebe, H.F. Sanchez, and P.M. Wikoff,“Membrane Technology and Applications: An Assess-ment,” EGG-2282, U.S. DOE Contract No. DE-AC07-76ID01570, Feb 1984
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McHugh, K.M., Key, J.F. Use of de laval nozzles in spray forming. JTST 3, 191–196 (1994). https://doi.org/10.1007/BF02648277
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DOI: https://doi.org/10.1007/BF02648277