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Balls of HighTech Ceramic
Ruby
Synthetic ruby and sapphire are monocrystalline aluminium oxides. Sapphire more less is pure ( 99,99% Al 2O3), ruby’s color comes from admixture with a little chromium oxide (CrO3). Both crystallines are hexagonal rhombohedral structured, hardness of both is ca. 2300 Vickers.Characteristics
- inert and very resistant against aggressive media
- excellent heat conductivity (particularly at kryotemperatures)
- also excellent heat resistance and resistance against thermal shocks.
- brilliant resistance against scratching and wear
- good resistance against corrosion and abrasivity
- extreme hardness (behind diamond the most hard technical material)
- excellent electrical characteristics (high electrical resistance, high dielectric coefficient)
| chemical formula | Al 2O3 |
| structure | exagonal rhombohedral |
| molar weight | 101,94 |
| mass density, g/cm³ (20 °C) | 3,98 |
| dielectric coefficient at 102-108Hz at 298K parallel perpendicular |
|
| 10,55 | |
| 8,6 | |
| melting point, K | 2300 |
| heat conductivity, W/(m K) at 300 K parallel perpendicular |
|
| 35,1 | |
| 33.0 | |
| thermal expansion, 1/K at 293 K parallel perpendicular |
|
| 5,6 x 10 -6 | |
| 5,0 x 10-6 | |
| spec. thermal capacity, cal/(g K) at 298 K | 0,18 |
| band gap. eV | 9,9 |
| water solubility | Keine |
| Mohs hardness | 9 |
| Knoop hardness, kg/mm² | 1370 |
| elasticity modulus E, GPa | 335 |
| shear modulusl G, GPa | 148 |
| compressive modulus K, GPa at 273 K | 240 |
| rupture modulusl, MPa | 350…690 |
| Poisson's Ratio | 0,25 |
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