We are exploring the idea of using induction to heat up a small platinum crucible (height x diameter x wall thickness is 20mm x 6mm x 1mm) to 1400 °C in vacuum. The Pt crucible will be placed in an evacuated quartz tube of c. 20 mm o.d., the entire assembly is then placed in the coil. The heating should be stable (say ±50 °C) for at least 30 minutes.
Induction is a new field to us. Which specifications of the heater would you recommend for this task? (e.g. frequency, current and other important things I might be missing).
So far it seems that a 1-2 kW machine with a frequency between 100 and 500 kHz could do the trick. Due to chemical constraints in the experiment, the frequency must stay less than 1000kHz. We're happy for any input that get us on track. thanks!