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How To Choose A Tube Furnace

  1. Know your application

    • Single Zone vs Multi-Zone: Multi-zone furnaces have multiple independently-controlled, constant-temperature zones, which allows controlled temperature gradient or a longer heating zone

    • Horizontal (standard) vs Vertical: Vertical tube furnace provides smaller footprint and can be used for fast heating / quenching process

    • High Pressure / Vacuum Furnace: Special designed furnace with stainless steel or superalloy-based tube for high pressure / vacuum processing at high temperature

    • Rotary Tube Furnace: Tube is rotated during heating for better powder processing / coating uniformity

    • Multi-Function: Tube furnace based complete systems, such as CVD, PECVD, HPCVD, ALD, Graphene & 2D material growth system, are available

  2. Certifications for tube furnace

    • All MTI's furnaces are assembled and quality controlled in USA and CE certified

    • As for UL / CSA certification, please check link 1 for tube furnace models that have already been certified, and link 2 for models that are ready to pass the inspection at extra cost

  3. Choose working temperature

    • Please note there are maximum temperature (can be maintained < 1 hr) and continuous working temperature (safe, continuous use temperature)

    • The maximum working temperature depends on the heating element used, and can be divided into four categories:

      a.   250 ~ 1250 °C       Fe-Cr-Al or Ni-Cr-Al alloy heating element        K type thermocouple
      b. 1300 ~ 1600 °C       SiC heating element                                       S type thermocouple
      c. 1600 ~ 1800 °C       MoSi2 heating element                                   B type thermocouple
      d. 1800 ~ 2000 °C       Graphite or W heating element                        C type thermocouple
    • Select the processing tube corresponding to the furnace max temperature:

      a. Quartz tube:            ≤ 1200 °C in 1 atm; ≤ 1000 °C under vacuum
      b. Mullite tube:            ≤ 1500 °C in 1 atm; ≤ 1300 °C under vacuum
      c. Alumina tube:          ≤ 1800 °C in 1 atm; ≤ 1500 °C under vacuum
      d. SS310 tube:            ≤ 1000 °C in 1 atm; ≤ 800 °C under vacuum. (For high pressure / vacuum furnace)
      e. Superalloy tube:       ≤ 1000 °C in 1 atm; ≤ 900 °C under vacuum. (For high pressure / vacuum furnace)
  4. Choose heating zone length based on your sample

    • Please note there are total heating zone length (length covered by heating element) and constant temperature zone length (center zone with less than +/- 1 °C variation). Constant temperature zone is always shorter than the total heating zone. Please choose a furnace with a constant temperature zone longer than your sample for uniform heating

  5. Choose the tube size (inner diameter) and crucible size based on your sample

    • Please choose the corresponding tube size and crucible size based on the sample volume

  6. Choose input voltage

    • Choose between 110 VAC and 220 VAC depending on the country or region

  7. Choose a vacuum pump

  8. Customize your furnace by choosing from various furnace accessories provided by MTI

    • Corrosive gas accessory

  9. If you have any question on configuring your tube furnace, please contact MTI technical support to discuss your application needs

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