sapphire seed rod for sapphire crystal growing , Al2O3 single
crystal glass ,sapphire optical glass ingots, 20x20mm customized
sapphire optical rods,sapphire optical stick,Al2O3 single crystal
glass lens,optical glass ingots by sapphire , polished sapphire
optical rods
Commen Specification for Sapphire Seed Rods
Diameter 0.2-300mm or customization(20x20mm,10x10mml,dia20mm)
Diameter tolerance +/-0.1mm to +/-0.01mm
Thickness 0.10-100mm(150mm)
Thickness tolerance ± 0.1mm or +/-0.01mm
Surface quality (scratch & dig) 60/40, 40/20 or better20/10
Surface accuracy λ/10, λ/2, λ
Clear Aperture >85%, >90%
Parallelism +/-3' ,+/-30''
Bevel 0.1~0.3mm×45 degree
where is sapphire from?
Synthetic Sapphire is a single crystal form of corundum, Al2O3, also known as alpha-alumina, alumina,
and single crystal Al2O3. Sapphire is aluminium oxide in the purest form with no porosity
or grain boundaries, making it theoretically dense. The combination
of favourable chemical, electrical, mechanical, optical, surface,
thermal, and durability properties make sapphire a preferred
material for high performance system and component designs. For
various semiconductor applications, sapphire is the best choice in
comparison with other synthetic single-crystals.
Main properties of sapphire:
| Chemical formula | Al2O3 |
| Crystal class | Hexagonal system, rhomboidal class 3m |
| Lattice constants, A | a=4.785, c=12.991 |
| Density, g/cm3 | 3.98 |
| Melting point, °K | 2303 |
| Hardness | Knoop(daN/mm2): 1800 parallel to C-axis, 2200 perpendicular to C-axis, Mohs: 9 |
| Optical transmission range, µm | 0.17 - 5.5 |
| Refractive index at 0.532 µm | n0=1.7717, ne=1.76355 |
| Water absorption | nil |
| Young Modulus, Gpa | 345 |
| Shear Modulus, Gpa | 145 |
| Bulk Modulus, Gpa | 240 |
| Bending Modulus (Modulus of Rupture), Mpa | 420 at 20°C, 280 at 500°C |
| Elastic Coefficient | C11=496, C12=164, C13=115, C33=498, C44=148 |
| Poisson ratio | 0.25-0.30 |
| Friction Coefficient | 0.15 on steel, 0.10 on sapphire |
| Tensile strength, MPa | 400 at 25°, 275 at 500°, 345 at 1000° |
| Flexural strength, daN/mm2 | 35 to 39 |
| Compressive strength, GPa | 2.0 |
| Young’s modulus E, daN/mm2 | 3.6 x 104 to 4.4 x 104 |
| Specific heat, J/(kg x K) | 105 at 91°K, 761 at 291°K |
| Thermal coefficient of linear expansion, K-1,at 323K | 6.66 x 10-6 parallel to optical axis, 5 x 10-6 perpendicular to optical axis |
| Thermal conductivity, W/(m x K) at 300K | 23.1 parallel to optical axis, 25.2 perpendicular to optical axis |
| Resistivity, Ohm x cm | 1016 (25°), 1011 (500°), 106 (1000°) |
| Dielectric constant | 11.5 (103 - 109 Hz, 25°) parallel to C-axis, 9.3 (103 - 109 Hz, 25°) perpendicular to C-axis |
| Dielectric strength, V/cm | 4 x 105 |
| Loss tangent | 1 x 10-4 |
Solubility
-in water
-in HNO3,H2SO4, HCl, HF
-in alcalis
-in melts of metals Mg, Al, Cr, Co, Ni, Na, K, Bi, Zn, Cs |
insoluble
insoluble to 300°C
insoluble to 800°C
insoluble to 800-1000°C |
| g -radiation stability | No change in transmission above 2.5 mm after exposure to 107 Rads. No visible coloration after exposure to 108 Rads/hr for 60 minutes at - 195°C |
| Proton radiation stability | No change in transmission below 0.3 µm after exposure to 1012 proton/cm2 total dose |
Chemical resistance
| Sapphire is highly inert and resistant to attack in most process
environments including hydrofluoric acid and the fluorine plasma
applications commonly found in semiconductor wafer processing (NF3,
CF4) |
what is advantagement of sapphire?
1-Thinner and Stronger than Standard Glass Windows
2-Transmits Wavelengths Ranging From UV to Mid-Infrared
3-Features Extreme Surface Hardness and Chemical Resistance
what is applications for sapphire ?
Sapphire substrates / wafers: EPI-polished, optically polished, lapped or as-cut sapphire disks,
windows, substrates, blanks as well as epitaxial structures
“silicon-on-sapphire” (SOS) .
- LED Substrates/ cooling Submount for Led tube
- glass cover for camera,phone, fingerprint identification,watch screem other consumer electronics.
- medcine usd as like sapphire blade,Bacterial culture substrate,laser leading block.
- Optical glass lens for windows, in high temperature
- sapphire bearing ,sapphire ball
3.0 sample
4.We can supply professional customized service in time and provide
cooperation
and support of new product development and technology appliance
including other
semiconductor materials wafers and optical lens as like~
5.0 packing ＆ delivery
