Sapphire Crystals
Product Highlights
HTOT sapphire crystal is synthetic hexagonal structure crystal growing by high-temperature melting and crystallizing of high-purity alumina (Al2O3) with a purity over 99.999% in a crystal growth furnace. Sapphire crystal has remarkable characteristics of high sound velocity, heat resisting, corrosion resisting, high hardness, high light transmittance and extremely high melting point(2050℃）. So sapphire crystal has been widely used for optical components, optoelectronics components, IR facilities， high-strength laser films and photomask.
HTOT sapphire crystal growth method is an advanced US technology based improved heat exchange method (HEM) . HEM sapphire crystal has several advantages:
-Sapphire boules's shape is regular.
-Sapphire quality is stable.
-Sapphire product utilization is high.
HTOT sapphire crystal properties：
| Mechanical properties |
— | Optical properties |
— |
| Density | 3.97g/cm³ | UV | ＞70% |
| Vickers hardness | 22GPa | Visible~near mid-infrared | ＞87% |
| Tensile strength | 413.79MPa | Refractive index | 1.83@255nm |
| 1.76@630nm | |||
| 1.58@5570nm | |||
| Compressive strength | 2068.97MPa | — | — |
| Young's Modulus | 74×106psi |
— | — |
| Poisson's Ratio | 0.28 | — | — |
| Electrical Prperties | — | Thermal properties |
— |
| Conductivity |
@25℃＞1018ohm cm @500℃＞1012ohm cm |
Melting Point | 2050℃ |
| Dielectric Constant |
(⊥)C 9.3 （KHz-I GHz,25°） |
Thermal Conductivity |
32W/Mk (@258℃） |
|
(∥)C 11.5 （KHz-I GHz,25°） |
|||
| Dielectric Strength | 480,000v/cm | Specific Heat | 1.99J/cm³℃ |
| Item | Parameter | Testing Equipment |
| EPD | ＜1000/c㎡ | Leatz Polarrizing microscope |
|
Rocking Curve FWHM |
＜15" | X' TRA |
| Purity | ＞99.999% | GDMS |
HTOT Sapphire Crystal's Orientation Difference：
| Sapphire Crystal Orientation |
Hardness (㎏/mm2) |
Flexural Strength （MPa） |
Dielectric Constant |
Different Orientation Performance |
| C | 2200 | 350 | 11.5 | Isomorphism |
| A | 1800 | 500 | 9.3 | Isomerism |
| M | 1800 | 500 | 9.3 |
Isomerism |
HTOT Sapphire Crystal Sizes：
| — | Weight | Diameter | Height | Crystal orientation |
| 115kg grades | 100-200㎏ | 380-400mm | 210-260mm | A-Plane |
| 130kg grades | 120-140㎏ | 380-400mm | 250-300mm | A-Plane |
| 165kg grades | 140-170㎏ | 440-460mm | 260-300mm | A-Plane |
| 200kg grades | 200-260㎏ | 500-520mm | 280-300mm | A-Plane |
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