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|
|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.