The melting of the reactor tube can be explained by the formation of an alloy of aluminum with nickel and not excess of inner heat. The melting point of this alloy is about of 1200 C degrees. IMHO.
SergeiGodin
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Posts by SergeiGodin
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Triac is powered with 120V over transformer. There was around 80V on the coil when it failed.
Let me add my five cents in your discussion. The Kanthal do not like to work in contact with any covering, alumina ceramic too. It loves open air. I can guess that as a result, of local overheating and melting the heater wire in one place, the electric arc occurred and the ceramic coating was destroyed. In the following experiments it is necessary to provide air access to the heater and it will work good up to 1350 degrees.
