Alumina (Al₂O₃)
Al₂O₃ is primarily characterized by its exceptional hardness.
In addition, it offers excellent wear resistance and high thermal conductivity combined with outstanding chemical stability.
It is also our standard material for both additive manufacturing and green machining.
Typical applications include crucibles for analytical processes or holders used in induction welding. Sensor housings and insulators for ignition systems are also feasible, as well as any other custom application.
Hilgenberg Ceramics is your expert partner for CNC machining and 3D printing of Alumina parts – achieving up to ±10 µm precision through our grinding process.
Material Data Sheet of Alumina
| Property | Unit | Typical Value |
|---|---|---|
| Purity¹ | % | 99,9 |
| Density | g / cm3 | 3,98 |
| Strength, 4-point bending test² | MPa | 300 - 400 |
| Elastic Modulus | GPa | 380 |
| Vickers Hardness HV | GPa | 17 - 23 |
| Thermal Conductivity | W / m K | 30 |
| Coefficient of Thermal Expansion | ppm / K | 7 - 8 |
| Specific Electrical Resistivity, 20 °C | Ohm m | 1012 - 1015 |
| Dielectric Strength | kV / mm | >25 |
| Maximum Operating Temperature | °C | 1900 |
1Contains 0.05% MgO as a grain growth inhibitor. MgO is not considered an impurity.
2Material strength values are statistical in nature. Please contact us if you need to meet specific parameters.