Alumina ceramics
High precission alumina ceramics for complex technical elements
Characteristics
Crytur produces complex 3D shapes from engineering grade alumina with high ratio of polycrystalline Al2O3 and low porosity. Production process involves precision machining and several highly controlled sintering steps.
Resulting material has unique combination of physical properties
- Durability (high mechanical strength, high hardness, high stiffness, good wear resistance)
- Resistance (high temperature resistance, high corrosion resistance)
- Electrical (high dielectric strength, low dielectric loss)
- Thermal (high melting point, high thermal shock resistance, good thermal conductivity)
- Thermo-mechanical (low thermal expansion)
Material characteristics
| Physical properties | |
|---|---|
| Composition | 98% Al2O3 |
| Porosity | Fully gas tight |
| Density | 3850 kg/m3 |
| Color | White |
| Thermal properties | |
| Thermal conductivity | 29 W/(m * K) |
| Coeficient of thermal expansion (300 - 900K) | 8x10-6 /K |
| Specific heat kapacity | 880 J/(kg * K) |
| Maximum service temperature | 1650 °C |
| Fracture toughness tests | |
| Fracture toughness | 4.3 MPa*m1/2 |
| Flexural strenght | 386 MPa |
| Modulus of elasticity | 331 GPa |
| Compressive strength | 2070 MPa |
| Vickers pyramids number | 1340 HV |
| Electrical properties | |
| Dielectrict strength | 9.3 kV / mm |
| Dielectrict constant (1MHz) | 9.4 |
| Specific resistance (20 °C) | 1016 Ω * m-1 |
Application
Alumina ceramics is widely used in various applications with challenging mechanical, thermal or chemical conditions. Low porosity makes it suitable in high vacuum applications. It is also frequently used for electric insulation and electronic packaging.
- HIGH VACUUM INSULATING GROMMETS
- ELECTRON MICROSCOPY
- LASER TECHNOLOGY
- SEMICONDUCTOR COMPONENTS
- AEROSPACE COMPONENTS
- AUTOMOTIVE SENSORS
- ELECTRICAL OR ELECTRONIC INSULATORS
- BEARINGS TO ANALYTICAL INSTRUMENTATION
- REFRACTORY ELEMENTS
