Technical ceramics in particular Al2O3
Technical ceramics are high-performance materials that can be divided into four material groups: silicate ceramics, oxide ceramics, non-oxide ceramics (carbides and nitrides) and piezoceramics. As a rule, they are formed at room temperature from a raw mass formed from ceramic powder, organic binder and liquid and only acquire their typical material properties in a sintering process at high temperatures.
Alumina with an Al2O3 content of more than 80% to over 99% is the technically most important oxide ceramic material. It is characterized by
- high strength and hardness,
- high wear resistance and corrosion resistance,
- high thermal conductivity,
- excellent insulating properties,
- high toughness and
- high temperature strength.
Key properties by purity:
| Property | 96 % (C795) | 99,8 % (C799) |
|---|---|---|
| Density | 3,75 g/cm³ | 3,96 g/cm³ |
| Flexural strength | 310 MPa | 630 MPa |
| Weibull modulus | 13 | 15 |
| Compressive strength | 2500 MPa | 4000 MPa |
| Fracture toughness | 4,0 MPam½ | 4,3 MPam½ |
| Young's modulus | 350 GPa | 406 GPa |
| Vickers hardness HV1 | 1620 MPa | 2000 MPa |
| Max. Operating temperature | 1600°C | 1700°C |
| Melting point | 2054 °C | |
| Boiling point | 2980 ± 60 °C | |
- in electrical engineering,
- in electronics
- in mechanical and plant engineering
- in chemical and process engineering
- in medical technology,
- in high-temperature technology.
Our range of products includes semi-finished products such as blocks, rods, plates and discs as well as thermocouple protection tubes, insulators, radiant tubes and customer-specific CNC-manufactured components according to drawings.
