Induction Heat used to melt glass and other metals

This is the start of an intended discussion about using induction heat to melt glass and other various metal.

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Glass IS a conductor, but only sensibly above about 600 C, a good glow. Tanks of liquid glass ARE heated by passing current through them resistively, with molybdenum electrodes.....

Induction heating, AFAIK could also be used at that point.


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.

The link was excellent. I've passed it round my co-workers here. We make instruments for measuring the properties of liquid glass.


There it is.

What's the conductive part, Steve? Is it the impurities? I wouldn't expect SiO2 to be conductive. However, off to Google...okay, I could use a reference. I can't find anything that tells me the conductivity of molten silica.
1Na2O : 1CaO : 6SiO2
1K2O : 1CaO : 6SiO2
1K2O : 1PbO : 6SiO2

Glass is something of the sort. It it's heated shouldn't the Na, K, whatever ions be able to move through the molten silica?
Ah! Yes, it wouldn't surprise me if some of those additives dissociated and provided conductivity. Thank you very much!

As the site physicist, I was oversimplifying "glass" to "silicon dioxide" :-)
Wow!!! I've just seen a benefit in having read a random page in the last year Chemistry book during a boring lesson.
By the way, WHY they dissociate? Liquid SiO2 should be nonpolar... Or do we need a large electric field to orientate and then tear apart molecules? That should be VERY high voltage...
Why do you think SiO2 is nonpolar?
kelseymh Arano6 years ago
I think it depends on the material in which it is found. The bond angle seems to vary from nearly waterlike (130-ish degrees, if I recall), all the way up to 180 degrees. The former can be polar, while the latter, just from symmetry, cannot.
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