I am trying to create a transparent Bridgman furnace (tube furnace) with two zones. The furnace will consist of two quartz tubes concentric with each other and the inner tube will have coils of heating wire wrapped around it. The two zones of heating (two seperate coils each spanning half the length of the inner tube) will be powered by a PID controller rated at 115V and 17.4A.
Inner tube: Inner Diameter 55mm (~2.2in), Outer Diameter 59mm (~2.3in), Length 36in
Outer tube: Inner Diameter 70mm (~2.8in), Outer Diameter 74mm (~2.9in), Length 36in
I would like both the top and bottom zones to be capable of creating up to 1000C temperatures inside the inner tube. Due to the small size of the ampoule use for the crystal growth it can be safely assumed that the interior of the tube is just air.
Questions:
What gauge wire and what type of wire should I use to create the resistance heater coils without harming my PID controller?
What length of wire can I use to form the wire coils using the chosen wire gauge?
If someone could show me with calculations that if I were to purchase ___ guage of ___ type of heater wire I could easily create 1000C without getting even close to hurting my instruments I would be ecstatic.The specifics of these calculations are confusing me and the PID controller is much too expensive to trust my level of knowledge. A good reference image for something similar to what I am creating is http://www.tvu.com/TFOps850C5Mar11.jpg though I am not using any form of gold coatings. Thank you for any replies you give me!
Inner tube: Inner Diameter 55mm (~2.2in), Outer Diameter 59mm (~2.3in), Length 36in
Outer tube: Inner Diameter 70mm (~2.8in), Outer Diameter 74mm (~2.9in), Length 36in
I would like both the top and bottom zones to be capable of creating up to 1000C temperatures inside the inner tube. Due to the small size of the ampoule use for the crystal growth it can be safely assumed that the interior of the tube is just air.
Questions:
What gauge wire and what type of wire should I use to create the resistance heater coils without harming my PID controller?
What length of wire can I use to form the wire coils using the chosen wire gauge?
If someone could show me with calculations that if I were to purchase ___ guage of ___ type of heater wire I could easily create 1000C without getting even close to hurting my instruments I would be ecstatic.The specifics of these calculations are confusing me and the PID controller is much too expensive to trust my level of knowledge. A good reference image for something similar to what I am creating is http://www.tvu.com/TFOps850C5Mar11.jpg though I am not using any form of gold coatings. Thank you for any replies you give me!