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Crucible in very hot electric (arc) furnace
QUESTION:Trying to obtain a source of very high temperature (above 1500oC)
I tried a welder with carbon rods connected on pieces of coal
in a refractory cilindrical hole of 5 cm diameter.
The coal gets white hot (too bright to be viewed by the
naked eye) while the welder (100 Amps) hums. So the
temperature is not the problem. But I want to melt platinum class
metals this way *without* being contaminated by the carbon.
Hessian crucibles break apart (cannot withstand such temps ?).
Any ideas ?
ANSWER: It's not my field, we have Mo wire furnace (1700C), and
Lindberg 3 zone 1200C tube furnace, where we use refractory
tubes with vacuum or gas pressure, but we really are only
interested in major composition changes of materials within
the tubes. I'd talk to some of the tube furnace manfacturers
( such as Lindberg), and some of the refractory tube suppliers
( who should be available on the WWW ).
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