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Alumina
Alumina is the most important oxide-ceramic material and a significant module in our production programme. Its most outstanding properties in keeping as:
Typical characteristics:
- Good flexural strength
- Very high hardness and wear resistance
- Very high corrosion resistance
- High thermal stability
- Excellent dielectric properties
Our 99.5% purity is very small grain size results in a fine and fibre friendly surface.
These strengths pre-determine its use, for instance, extrusion cores, pump sleeves, high voltage insulators and grinding media for mills.
| ALUMINIUM OXIDE (Al2O3) | |||
| Al2O3 | % | 99.5 | 95 |
| H20 Absorption | % | 0 | 0 |
| Color | - | White | White |
| Density | g/cm3 | 3.9 | 3.7 |
| Hardness | Moh’s | 9 | 9 |
| Flexural Strength | MPa | 370 | 320 |
| Compressive Strength | MPa | 2600 | 2200 |
| Fracture Toughness(Kic) | MPa m1/2 | 4.6 | 4.0 |
| Thermal Expansion Coefficient(20°C-1000°C) |
1*10-6 /°C |
8.2 | 7.8 |
| Thermal Conductivity | W/m K | 30 | 24 |
| Max. Service Temperature | °C | 1600 | 1400 |
| Dielectric Loss Tangent | - | 1*10-4 | 3*10-4 |
| Dielectric Constant | 1MHz | 9.7 | 9.0 |
