Salutations Xathix,
...to make a type of vaporizer that I can put directly onto bud in a bong with an electric current heating element to burn it instead of using a lighter.
Hummm... Would the power of fire (or so) suit your needs?
Though i guess no combustion is actually intended, of course. Or it wouldn't be a vaporizer as we usually think of them anyway!
What types of metals should I avoid...
Anything that generates emanations within the operating range. So i sort of wonder because there's a type of metal known as Curie alloys which heats up fairly quickly then it stabilizes around a "Curie point"; lets see a chart:
In addition those are real-world values (from a commercialized product):
...and this is a probable metalurgical formulation candidate:
Alloy Ni-SPAN-C 902
190 °C (374 °F) Curie point
190 °C (374 °F) Ni-SPAN-C 902
According to my sample selected above it seems target thermostatic cannabic vaporisation temperatures correspond to the lower Curie-effect range (red), so are there any fumes emanating from such alloy at 190 °C? If not that could mean we can have a new type of "conduction" mode, one without the typical burns...
Well that's certainly a question i got somewhat on my mind too.
Good day, have fun.