Model Experiments on Melting of Alloys with Low Melting Temperature in a Medium with High Melting Temperature

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Model Experiments on Melting of Alloys with Low Melting Temperature in a Medium with High Melting Temperature

Experiments of alloy melting were carried out in water/HCl-H2O eutectic model system. The eutectic has a solid-liquid equilibrium temperature of -74 ℃. 5 cm diameter spheres of the eutectic in which three thermocouples in the core, on the edge and in the middle between them had been positioned were cooled to -196 ℃ in liquid nitrogen. After cooling the spheres were immersed into water of 10 ℃, and the changes of temperatures with time in the three thermocouples were measured. In some experiments the temperature on the outer side of the spheres where an ice shell grew up was also measured. In these experiments, the growing rate of the shell was additionally determined. The results for the first minute of the melting process, where the system can be considered as one-dimensional, were described by an exact solution of Fouriers equation. The density of liquid ferromanganese at 1 500 ℃ was measured.