Rotary tube furnaces provide efficient heat and mass transfer and minimize material handling in applications such as powder processing. Deltech rotary tube furnaces are custom designed and built for your particular application requirements, so you can specify:
- Maximum operating temperatures up to 1700 degrees Celsius
- Workspace size
- Residence time
- Tube rotation rate
- Tube inclination angle
- Temperature profile
- Atmosphere flow rate
- Powder bed depth
- Feed rate
Here is what you should know about choosing a tube for your furnace:
Tube stresses include rotational speed, amount of material, diameter of the tube, suspended length, and tube thickness.
For tube diameters larger than 9”, alloy tubes are best but they are limited to temperatures under 1200 degrees Celsius.
Use ceramic tubes when metals in the alloy might react with a high purity product or off gas. These are also required for high temperature processing.
Lower grade silicon carbide tubes are porous, as are alumina oxide tubes. That makes them undesirable for most applications that require processing in a controlled atmosphere.
Quartz tubes are not permeable, but only suitable for processing under 1300 degrees Celsius.
You may not know that…
Rotary tube furnaces are unsuitable when long residence times – requiring a small angle of inclination and a slow tube rotation rate – are required. It is difficult to control residence time for more than two hours. Look to a lab scale or production size bottom load, front load, or top hat furnace if your product requires longer processing times. These furnaces are available with optional controlled atmosphere capability.
Not sure what you need for your application? We can help.
Contact us for more information.