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Spark erosion: A method for producing rapidly quenched fine powders

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Abstract

Spark erosion is a method for producing fine powders of metals, alloys, semiconductors, and compounds. The technique involves maintaining repetitive spark discharges among chunks of material immersed in a dielectric liquid. As a result of the spark discharge there is highly localized melting or vaporization of the material. The powders are produced by the freezing of the molten droplets or the condensation and freezing of the vapor in the dielectric liquid. Since the powders are quenched in situ, they may be extremely rapidly cooled. Particles can be produced in sizes ranging from 5 nm to 75 μm. The average powder size and production rate depend on the power parameters, material used, and the dielectric liquid.

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Author notes

  1. A. E. Berkowitz

    Present address: Center for Magnetic Recording Research, R-001, University of California, San Diego, La Jolla, California, 92093, USA

Authors and Affiliations

  1. General Electric Corporate Research and Development, P. O. Box 8, Schenectady, New York, 12301, USA

    A. E. Berkowitz & J. L. Walter

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  1. A. E. Berkowitz
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  2. J. L. Walter
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Berkowitz, A.E., Walter, J.L. Spark erosion: A method for producing rapidly quenched fine powders. Journal of Materials Research 2, 277–288 (1987). https://doi.org/10.1557/JMR.1987.0277

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  • DOI: https://doi.org/10.1557/JMR.1987.0277

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