I had an interesting experiment yesterday.  This was my first time using a
triac to regulate input power and sealing the tube with a compression
fitting.  Unfortunately, my thermocouple failed.

Take a look at the alumina tube and the evidence for melting.  The furnace
sealant which I coated it with completely melted and agglomerated to the
bottom of the cell (also appears to be mixed with melted alumina).


The tube was purchased from China and is purportedly 95% pure.  It was
supposed to have a continuous operating temperature of 1500C.

Any opinions?


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