Al2O3 Alumina Ceramic Parts
Refractory Alumina Ceramic Tubes for Furnace Duty
Work tubes thermocouple sheaths and element supports to 1650 degrees C
Inside a furnace the tube has two jobs at once: keep the atmosphere away from what is inside it, and keep its shape while doing so. Alumina ceramic tubes at 3.85 g/cm3 and Mohs grade 9 hold up to a maximum use temperature of 1650 degrees C and stay inert against the corrosive atmospheres found in thermal power and heat treatment plant. Tubes are supplied to your bore, wall and length.
Key Benefits
- Maximum use temperature of 1650 degrees C covers most kiln and furnace duty
- Density 3.85 g/cm3 gives a gas tight body for protection tube work
- Mohs grade 9 hardness resists the abrasion of loading and unloading work
- Electrically insulating, so the same tube can sheath a thermocouple or an element
- Made to your dimension and performance requirement rather than a stock length
Problems It Solves
- Metal sheaths that scale and fail in an oxidising furnace atmosphere
- Thermocouple readings drifting because the sheath is contaminating the junction
- Element supports sagging at temperature and shorting against the furnace wall
Who It Is For
- Furnace and kiln builders specifying tube sets
- Laboratory and heat treatment plants replacing failed protection tubes
- Thermal power maintenance buyers working in corrosive high temperature service
Application Scenarios
Kiln furniture and furnace work tubes
Vacuum furnace components
Heating element supports and electrical insulators
Temperature measurement and thermocouple protection
Technical Features
- Density 3.85 g/cm3
- Mohs hardness grade 9
- Maximum use temperature 1650 degrees C
- Supplied in white or pink alumina bodies
Manufacturing Process
Raw material preparation, forming, surface grinding, internal and external diameter grinding and precision CNC machining are all carried out in house.
Materials
- Alumina ceramic
Specifications
| Material | Alumina ceramic |
|---|---|
| Colour | White or pink |
| Density | 3.85 g/cm3 |
| Mohs hardness | Grade 9 |
| Maximum use temperature | 1650 degrees C |
| Size | To customer drawing and performance requirement |
Figures are taken from the published product specification. Values not listed are marked TBC and confirmed against your drawing before quotation.
Quality Control
- Bore, wall thickness and straightness checked against the drawing
- Inspection report issued to your drawing on request
- Tubes packed with the packing process photographed before shipment
Certifications
No third party certification documents are published for this product. Every shipment is inspected to your drawing with an inspection report issued. Certification status is TBC and confirmed on request.
Customization Options
- One end closed or both ends open
- Bore, wall and length set by your drawing
- Supplied according to your dimension and performance requirement
Comparison With Other Ceramics
Alumina is the general purpose refractory tube material. Where the atmosphere is strongly reducing or the abrasion is severe, silicon carbide is the alternative; where the tube has to be brazed into a metal flange, ask about a metallized alumina version.
Use Guide
- Ramp temperature slowly on first firing to avoid thermal shock at the closed end
- Support a long horizontal tube at intervals so it is not loaded in bending when hot
- Do not clamp a hot tube directly against metal; allow for expansion
Industries Using This Part
Related Solutions
Related Application Notes
Refractory Alumina Ceramic Tube FAQ
What is the maximum working temperature?
1650 degrees C is the maximum use temperature for these alumina tubes.
Can you make tubes with one end closed?
Yes. Tubes are supplied according to the customer drawing, dimension and performance requirement.
Are these tubes suitable for thermocouple protection?
Yes, temperature measurement is one of the listed applications, along with furnace work tubes and element supports.
What is the density of the tube body?
3.85 g/cm3.
What is the lead time?
Samples in 4 to 7 working days, production 15 to 30 days when not in stock, depending on dimension and quantity.
Do you provide free samples?
Samples are free of charge; freight is paid by the buyer.
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Send a 2D or 3D drawing with the critical dimensions marked. Samples are free of charge and delivered in 4 to 7 working days.
Send a 2D or 3D drawing by WhatsApp or email. Samples in 4 to 7 working days.