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Thanks for that info. I thought glass was always a good insulator. Youtube has an experiment showing 2 bulbs in series. 1 bulb then is broken, the filament cut, and the remaining glass stem heated to red. The glass then acts as a variable resistor. I wanna share this link, but unsure how with this tablet.
There it is.
Glass is based on sand and from sand they also make transistors and diodes.
In the cold state glass is an insulator but once it reaches the melting point it becomes conductive, almost like a giant zener diode.
You need a lot of heat to melt but to keep in that state by electricity needs surprisingly much less power.
I did some stuff with induction heating and to do it with glass you still have to melt it first.
After that you can use low frequency inductive heating but it will be hard to get an even heating.
The magnetic field concentrates in the center and the eddy currents are only small.
One approach could be to use a suitable metal crucibel filled with glass.
This group has a well organized method of getting the job done without having to melt the glass first. It relies on the conduction of heat to melt the glass... A Moly electrode is mentioned as well as a tin-filled ceramic tube. Not quite feasible without lots of testing equipment and even so, their model is 3/4 of a meter and is still expensive to run. This is not a backyard project.
Posted:Jan 31, 2011
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