The subject is an unconventional method of heating and melting metals without a crucible, by suspension in space with an electromagnetic field. Operating conditions for certain cases are given. The results obtained by means of the new technique encourage the thought of melting, purifying, alloying, and agitating of inert and reactive metals without resort to crucibles, and thereby avoiding the contamination of reactive metals by crucible materials. Preliminary results with various forms and masses of metal are described. Considerations concerning the atmosphere in which levitation occurs are included.
An original method of heating and melting metals without a crucible, by suspension in space with an electromagnetic field, is described. The required field was generated by applying high frequency alternating current to two coaxial coils connected in series opposition. Stable levitation and heating of various metals in the solid state was obtained between the coils in the vicinity of the common axis, both in air and in a vacuum. Weights levitated ranged up to 550 grams. In air, some tens of grams of Al, Sn, and a brass were brought to melting and continued in levitation while in the liquid state. In a vacuum, 10 grams of Al was successfully levitated molten. On the other hand, several attempts to levitate molten Ag, Ti, and Zr in a vacuum failed.
Levitation of melts of about 10 grams in a protective atmosphere is described. There is a list, based on random experience, of materials that have been melted. Change of coil permits some temperature control. Shapes can be cast. There is a comparison with the technique of arc‐melting buttons, and a list of applications. An approximate formula for levitating force is given.
Application of acoustic levitation to the investigation of melting and freezing phenomena J. Acoust. Soc. Am. 79, S4 (1986); 10.1121/1.2023259Containerless melting and solidification of materials with an aerodynamic levitation system Rev. Sci. Instrum. 53, 851 (1982);
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