If you are using an inert gas atmosphere (which I consider a near-necessity for a general purpose ultra-hot oven) then you could use molybdenum tubing
which is readily available and not too expensive. Mo melts at 2623 C.
About that which we cannot speak, we must remain silent.
-Wittgenstein
Some things can never be spoken
Some things cannot be pronounced
That word does not exist in any language
It will never be uttered by a human mouth
- The Talking Heads
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