The electrical resistivity of metallic melts is of obvious importance to many
liquid metal processing operations, because it controls the melt flow under
the influence of electromagnetic fields, e.g., during casting processes, or
in crystal growth furnaces. On the other hand, via the Wiedemann-Franz
law, the knowledge of the temperature dependent electrical resistivity also
enables for many liquid metals an indirect determination of the temperature
dependent thermal conductivity without disturbances by any convective
fluid flow in the sample.
Here we propose the measurement of the electrical resistivity of pure and
industrial relevant high temperature metallic melts.
For hot metallic melts containerless handling and measurement methods, as
provided in the Material Science Lab / Electromagnetic Levitator (MSL /
EML) facility, are mandatory. In microgravity this facility yields an optimal
experimental environment for our intention: The sample is not disturbed by
external forces, which otherwise would lead to a distorted shape and to fluid
flow in the melt, is contained in a clean environment, and can be processed
over a large temperature range.
This project is considered as preparation of a g experiment in theMSL/EML
facility onboard the International Space Station ISS after the year 2007.
The results of these resistivity measurements shall be used as benchmarks
for ground based measurement techniques, as e.g. the fast pulse heating