I want to burn carbon rods in a vacuum chamber to coat samples in carbon and need the carbon rods to be completely evaporated (worn out /eroded) through electrical power. I also need the +ve terminal to be fed slowly towards the -ve as its eroding
My questions are, which would be most efficient way of eroding carbon:
1) should I use High voltage low current (eg flyback transformer) or 2) low volt high current (eg welding machine) or 3) AC / DC or pulsed or 4) which combination of above?
any other info on how to feed the +ve towards the -ve (as it senses no current flow) would be appreciated..