Floating-zone melting with viscous torque control

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Abstract
Two control devices were used in an RF furnace as well as in an arc image furnace in order to stabilise the liquid zone during crucible-free zone melting. The control principle is based on the relation between liquid-zone dimensions and a viscous frictional torque built up within the liquid by a laminar forced convection flow. This flow is due to the relative rotation of the two parts of the treated rod. This method is quite effective in the treatment of bar samples greater than 8 mm in diameter with rotational speeds between 100 and 600 rev min-1. It was applied in the crystal growth and directional solidification of eutectic alloys with growth rates ranging from 2 mm h-1 to 500 mm h-1.

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