Alumina tube furnace - Green furnace - E-118

Application

Possibilities:

• Temperature limit: 1550°C
• Max heating rate: 5ºC/min up to 300ºC, typically 4 h to 1500ºC
  
• Max cooling rate: 5ºC/min, typically 5 h from 1500ºC
  
• Size: 5 cm inner tube diameter
• Atmosphere:
  • Oxidizing
  • Non-toxic gas
  • Carbon-free environment
• Gas purging
• Sampling
• Cooling of off-gas

Can not be used for

• Samples which
  • Evaporate and condenses onto alumina tube
• Rapid heating/cooling
• Vacuum
• Precisely controlled atmosphere (leakage)
• Highly toxic gases (leakage)

Previously used for

• Hydrogen, CO and steam purging on silicon melt, with sampling of melt.

Before you begin

• Contact equipment responsible:
  
  
• Equipment may not be used without training
• Contact room responsible for access.

Relevant links:

• Use of gas

Known problems and fixes:

• Alumina tube easily breaks by mechanical and thermal shock
• At present not vacuum tight (leakage)
• Heating and cooling take hours
• Crucible height can not be easily adjusted
  • Requires cutting and stacking of alumina spacers.
• Cooling water safety switch is sensitive
  • Typically causes "0r" error on temperature controller and power shut-down
  • Power can be turned back on after checking cooling water and ensuring contact in cooling water safety switch (push down lever).

Documentation