VERFAHREN UND VORRICHTUNG ZUR ERMITTLUNG EINER BESTIMMUNGSGROESSE FUER DEN UEBERGANGSBEREICH ZWISCHEN SCHMELZE UND KRISTALL.

摘要

A parameter for defining the transition zone between melt and crystal during the non-crucible zone melting or crystal pulling from a crucible is determined by using a rod or crucible holder with a magnetic suspension and by basing it on the frictional torque. The frictional torque is determined from data of the rotary drive and is measured by a cell for the torque transferred through magnetic fields, or alternatively from the relative speed drop of the holder after the drive has been switched off, bearing in mind the kinetic energy of the revolving parts.