Overview for Alumina Tube
The alumina ceramic tube (99.6% Al2O3 material) can be used at operating temperature upto 1750C degree in both oxidizing and reducing tmospheric conditions. Alumina Tubes could be evacuated max to 10-3 Torr under temperature 1600 degree C. It proves inert to carbon and refractory metals in many severe situations..
Product illustration
Various diameters of alumina ceramic tube for LABORATORY TUBE FURNACES
Various diameters of alumina ceramic tube for LABORATORY TUBE FURNACES
Technical Specifications
| Diameter range | OD40-100mm |
| Tube length | 500-2000mm |
| Wall thickness | 5mm |
| Chemical composition | Al2O3＞99.6%, SiO2＜0.1, Fe2O3＜0.05, R2O＜0.1 |
| Temperature controller | - Shimaden PID controller Auto-tune function Programmable 32 segments Temperature accuracy +/- 1°C
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| Tmax resistant | 1750 degree C |
| Warning | - Please don’t use alumina tube with vacuum above temperature > 1600 oC.
- Please always keep the heating or cooling rate less than 5C/ minute.
- Please handle the tube carefully. No any warranty for the tube
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Notes: Standard sizes OD40mm, OD60, OD100mm etc are available, other size can be produced as per customer’s requirements
Application Notes
The alumina content of the ceramic tube is more than 99.6%, the bulk density (g/cm2) ≥ 3.80, and continuous working temperature is 1600°C. The alumina tube features high-purity and high-temperature high-quality characteristics, but most corundum materials have poor thermal shock resistance so need to be cautious and careful during operation.
- For the first time using, it needs to be preheated to eliminate stress and pollutants. Set the heating rate of 5~8℃/min, heat up to 1300℃, keep it for 30 minutes. The temperature rise speed should not be too fast, and the temperature cooling rate should be set. The temperature rise rate should not be higher than 10°C/min, and the temperature cooling rate should be lower than 10°C/min (5°C per minute is better).
- When load and unload the samples, the furnace temperature should not be higher than 200 degrees. In addition, do not touch the furnace tube at high temperature with low temperature objects.
- Make sure the heated material moisture less. For crystal water and samples with high water content generated during heating, it is recommended to dry the material firstly, and then put them in the corundum furnace tube for sintering.
- When purging the atmosphere gases, pay attention to controlling the gas flow rate to avoid breaking due to the large temperature difference.
- Furnace tube support frames are welded on both sides of the furnace to avoid deformation and crack because of gravity.
- Put insulation ceramic plugs inside the tube.
- After using it, keep the inside of the tube clean, make sure no sample remains.
