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.
of negative ions in hydrocarbons. It might be of interest to find a reversible electrode for the positive ions; it would form the counterpart to the aliphatic electrode described. ABSTRACT Titanium metal was melted in vacuo in contact with A1203, BeO, and ThO2 respectively. The metal reacted vigorously with A1203, less so with BeO, and slightly with ThO~. Qualitatively, the relative positions of the oxides on the scale of reactivity with titanium are consistent with the oxygen dissociation pressures as calculated from thermochemical data.It was concluded that of the three oxides studied only thorium oxide showed any promise as a crucible material for melting titanium or titaniumbase alloys.
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