An alumina sleeve is a hollow cylindrical or sheath-shaped ceramic component made of alumina ceramic (Al₂O₃). It is a high-performance protective tube used for the protection, insulation, and isolation of internal components.
Alumina sleeve sizes are readily available from stock.
|
OD |
ID |
Longueur |
|
3-6mm |
1-4mm |
100-500mm |
|
6-12mm |
3-8mm |
200-1000mm |
|
12-220mm |
6-20mm |
300-3000mm |
Product Basic Parameters and Specifications
GORGEOUS CERAMICS (GGS) can provide you with customized alumina sleeves in various sizes and specifications, offering you a one-stop solution.
| Propriété | Unité | AL2O3 99.7 | AL2O3 99.5 | AL2O3 99 | AL2O3 95 |
| Pureté | — | 99.7% | 99.5% | 99% | 95% |
| Densité | g/cm3 | 3.92 | 3.9 | 3.8 | 3.7 |
| Résistance à la flexion | MPa | 375 | 370 | 340 | 304 |
| Résistance à la compression | MPa | 2450 | 2300 | 2250 | 1910 |
| Module d'élasticité | moyenne générale | 380 | 370 | 330 | 330 |
| Résistance à la fracture | MPam1/2 | 4.5 | 4.3 | 4.2 | 3.8 |
| Dureté | HRA | 91 | 91 | 90 | 89 |
| Dureté Vickers | HV1 | 1600 | 1550 | 1450 | 1400 |
| Coefficient de dilatation thermique | 10- 6 K-1 | 7.8 | 7.8 | 7.7 | 7.5 |
| Conductivité thermique | W/mk | 32 | 32 | 25 | 25 |
| Stabilité aux chocs thermiques | △T.℃ | 220 | 220 | 200 | 200 |
| Température maximale de fonctionnement | °C | 1750 | 1750 | 1700 | 1500 |
| Résistance volumique à 20℃ | Ω·cm | 1015 | 1015 | 1014 | 1014 |
| Rigidité diélectrique | KV/mm | 22 | 20 | 16 | 15 |
| Constante diélectrique (température ambiante) | / | 10 | 11 | 11.5 | 11 |
| Facteur de perte diélectrique MHz | tan δ | 1×10-3 | 1×10-3 | 3×10-3 | 3×10-3 |
How to customize products
Simply send us your drawings, and our professionals will evaluate them and provide you with the best solution.Below is a reference for custom specifications and dimensions available from GORGEOUS CERAMICS (GGS).
- Outer Diameter (OD): 0.5 mm ~ 500 mm+
- Inner Diameter (ID): 0.1 mm ~ 400 mm
- Length: Up to 3000–5000 mm (long tube splicing)
- Wall Thickness: 0.25 mm ~ 20 mm
FAQ
1.What are the uses of alumina bushings?
The primary use of alumina is to provide thermal protection, electrical insulation, and corrosion protection for internal components in high-temperature or harsh environments. Common practical applications include thermocouple protection, furnace systems, electronic insulation, and chemical equipment.
2. What temperature can alumina bushings withstand?
Typically, alumina bushings can operate at temperatures up to 1600°C.
3. What are the advantages of alumina tubing compared to metal tubing?
Compared to metal tubing, alumina tubing offers superior insulation, corrosion resistance, and will not rust. It also does not oxidize or scale at high temperatures.
