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Options for specific applications or processes
Carbolite
has over 50 years of experience in the design and manufacture of electric laboratory and industrial furnaces, tube furnaces, ovens & incubators. If you require further assistance on Carbolite's options for specific tube furnace applications or processes please e-mail Carbolite sales@carbolite-usa.com or telephone 800-543-6208.
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Worktubes |
- A ceramic or inconel worktube fitted inside a tube furnace allows the use of a gas atmosphere
- Various worktubes are available to suit different applications
- Sillimanite - porous, good thermal shock resistance (max temperature 1500°C)
- Impervious aluminous porcelain (IAP) - impervious (max temperature 1400°C)
- Mullite - impervious and resistant to flux, sulphurous & carbonaceous atmosphere (max temperature 1500°C)
- Recrystallised alumina (RCA) - impervious and highly resistant to chemical attack (99.7% Al2O3) (max temperature 1800°C)
- Advanced powder metallurgy (APM) - impervious FeCrAl alloy tube, not susceptible to thermal shock, but unsuitable for use inside (MTF & CTF) wire wound tube furnaces (max temperature 1300°C)
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Insulation plugs & radiation shields: |
Different types are available for specific applications
Ceramic insulating plugs:
Type C for an air atmosphere application
Type D for an inert gas atmosphere application
Radiation shields: Type D metal discs for up to 1200°C high purity atmosphere or vacuum - Type D alumina discs for up to 1800°C high purity atmosphere or vacuum |
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Worktube seals |
Seals are available to fit to worktubes to provide a gas tight seal:
- Gas tight seals - typically with gas inlet nozzles
- Gas tight seals with water cooling (required at 1500°C & above)
- Vacuum seals with NW16, 25 or 40 connection
- Vacuum seals with NW16, 25 or 40 connection plus water cooling
- High vacuum seals with NW16, 25 or 40 connection
- High vacuum seals with NW16, 25 or 40 connection plus water cooling
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Cascade control |
A standard control system senses the temperature close to the heating elements, while the temperature of the load is usually slightly lower. To correct this a second controller can be added; one senses the load, the other the elements.
The load controller sends signals to the element controller, which adjusts the element temperature accordingly. Faster warm up is achieved by boosting the element temperature when the load is cold, and by reducing it as the load approaches the desired temperature.
Normally a 2216 secondary controller is fitted in addition to a main 3216 or 3508. |
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