By WDQ OPTICS | 01 July 2015 | 0 Comments
The Properties of Synthetic Sapphire
Synthetic Sapphire is a form of Aluminum Oxide (Al2O3). In its natural state, Al2O3 is a white powdery material. Sapphire is one of the hardest minerals and ranks a 9 on the Mohs scale. Sapphire offers wideband transmission from UV to Mid-IR (0.15-5.5µm). Sapphire features exceptional properties of high hardness, high strength, scratch resistance, high-temperature resistance, purity, chemical durability, and superior radiation stability. These unique properties make sapphire ideal material for optical windows, tubes, rods, and balls used in many Scientific, Industrial and Military applications.
The Advantage of Synthetic Sapphire Crystal
Extremely hard, strong and wear-resistant
Excellent thermal conductivity/heat resistance
Exceptional chemical stability
Superior dielectric material with a high dielectric constant
Extremely high melting temperature (2030 °C)
Excellent transmission bandwidths (UV to IR)
The Properties of Synthetic Sapphire
The Advantage of Synthetic Sapphire Crystal
Extremely hard, strong and wear-resistant
Excellent thermal conductivity/heat resistance
Exceptional chemical stability
Superior dielectric material with a high dielectric constant
Extremely high melting temperature (2030 °C)
Excellent transmission bandwidths (UV to IR)
The Properties of Synthetic Sapphire
| Subjects | Units | Value | |
| General | Chemical Formula | Al2O3 | |
| Melting Temperature | ℃ | 2040 | |
| Optical | Index of refraction | 1.769 (parallel to C-axis) | |
| 1.760 (perpendicular to C-axis) | |||
| Infrared of penetrable index | >85% | ||
| Mechanical | Density | g/cm³ | 3.98 |
| Mohs Hardness | 9 | ||
| Knoop Hardness | dan/mm² | 1800 (parallel to C-axis) | |
| 2200 (perpendicular to C-axis) | |||
| Tensile Strength | GPA | 0.19 | |
| Compressive Strength | GPA | 2.1 | |
| Flexural Strength | GPA | 340~380 | |
| Electrical | Dielectric Constant | 9.3~11.5 | |
| Dielectric Strength | v/cm | 4.8x105 | |
| Resistivity | Ω/cm | >1016(25℃) | |
| Thermal | Thermal Expansion | ℃ | 6.7x10-6 (parallel to C-axis) |
| 5.0x10-6 (perpendicular to C-axis) | |||
| Specific Heat (0~100℃) | cal/g℃ | 0.16 | |
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