Alumina (Aluminum Oxide)Table
Table of material property - Alumina ceramics
Typical oxide-based ceramics most widely used in the industry
- Substance nameAlumina (Aluminium Oxide)
- Chemical formula Al2O3
- NotesLeft photo is white powder of alumina.
Physical property of Alumina ceramics
※ Purity 99% or more (literature value)
| Unit | Value | |
|---|---|---|
Gneral property |
||
| Bulk specific gravity | g/cm3 | 3.85 - 3.99 |
Mechanical property |
||
| Bending strength | MPa | 320 - 400 |
| Compressive strength | MPa | 2400 - 3000 |
| Young's modulus | MPa | 3.8 × 105 |
| Vickers hardness | HV | 1400 - 1800 |
Electrical property |
||
| Volume resistivity | Ω・cm | > 1014-15 |
| Dielectric breakdown voltage | kV/mm | 10 - 15 |
| Permittivity | ε(1MHz) | 9.5 - 9.7 |
Thermal property |
||
| Max. allowable working temp. | ℃ | 1500 - 1600 |
| Coefficient of thermal expansion | ×10-6/℃ | 7.0 - 7.7 |
| Thermal conductivity | W/m•k | 23 - 36 |
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