• calibration;
  • rheometer;
  • slags;
  • viscosity


For the investigation of rheological features like dynamic viscosity, a high temperature rheometer was able to be successfully established at the Institute of Iron and Steel Technology of the TU Bergakademie Freiberg. Based on known calibration problems with high-level pyrometries, the viscosity was calculated directly without calibration. This is possible with an air-bearing rheometer and exact absolute torque measurement via the electrical parameters of the drive and via movement parameters and geometry of the measuring pairing. This technique meets the desired requirements in view of measuring accuracy and reproducibility of the measured results. The measurements were carried out on silicone oils in the low temperature range under dynamic conditions. It was demonstrated that the silicone oils are suited for comparative measurements under different rheological conditions. The results from the comparison of the two measuring systems (CPM and CCM in high temperature configuration) have shown that, in the high-level temperature range, a measurement error <1% is to be expected.