nah they get worse with gas flow, those don't really care about reactivity too much, so long the temperature is high. They are MoSi type.
Thats probobly what I plan on using. 1850C is plenty. I would probably not exceed 1700.
I am more worried about the thermal design like spacing to prevent over heating and stuff like that.
The elements don't like being around gas flow, or under vacuum that much, you need to derate for those factors.
Picking the element type is the easy part.
Different 'conventional' furnace design can be used for operation in colder temperatures, up to like 1200C.
Was hoping someone had experience with this kind of equipment.