The Properties of Sapphire
|
| Materials |
Chemical Formula |
AL2O3 |
| Optic |
Index of
refraction |
No: 1.769
Ne:1.760 |
| Infrared of penetrable
index |
>85% |
| Mechanical
|
Specific
Gravity |
3.98~4.10
g/cm3 |
| Theoretical
Density |
99.98% |
| Open
Porosity |
0% |
| Hardness |
9 Mohs |
| Tensile Strength
|
0.19GPa |
| Compressive
Strength |
2.1GPa |
| Flexural Strength
|
340~380GPa |
| Coefficient Friction
|
0.14 against
steel |
| Electrical
|
Dielectric Constant
|
8.5~11(300KHz~1GhH) |
| Dielectric
Strength |
48000 V/cm |
| Thermal
|
Melting
Point |
2040°
C |
| Coefficient of
Expansion |
No:6.5x10-6°
C-1 (50 ° C) |
| Ne:3.0x10-6°
C-1 (50 ° C) |
| Specific
Heat |
750J/kg.°
C | |
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