Yellow Color Lab Cultured Synthetic Sapphire Crystal For Watch Case
Processing
Introduction of Synthetic Sapphire Crystal Boule
Sapphire, which is derived from the Latin Spphins, which means
blue; it belongs to the corundum group of minerals in the trigonal
crystal system. In the gem world, all colors of gem-grade corundum
other than rubies are called sapphires.
The main component of sapphire is alumina (Al2O3). Corundum
contains trace elements such as iron (Fe) and titanium (Ti), and
presents colors such as blue, sky blue, and light blue, among which
the bright sky blue is the best.
Sapphire has a melting point of 2040°C, and its high melting point
makes it inevitable that volatiles such as thermal systems and
crucibles exist in the crystal growth environment. A common type of
defects in the growth of sapphire crystals by the melt method is
that scattering points, bubbles, and inclusions are easily
generated during the crystal growth process.
It has a relatively large impact on the quality of the crystal.
Common inclusions in crystals include impurity elements from raw
materials and crucible materials, and fragments of tungsten,
molybdenum and other materials used as crucibles, heating bodies
and heat preservation devices.
One of the reasons for inclusions is that there is a phenomenon of
impurity removal in the process of growing crystals. The impurities
in the raw materials are discharged to the edge, and the impurities
in the crucible diffuse from the edge to the center. When the
impurity concentration reaches or exceeds the saturation
concentration of the impurity in the melt It precipitates out from
time to time, forming a radiation-type impurity group with fewer
central inclusions and more peripheral inclusions. The small size
of the package is mainly related to the purity of the alumina raw
material, the purity of the crucible material, and the density of
the crucible.
Parameters of Synthetic Sapphire Boule
| General | Chemical Formula | Al2O3 |
| Cystal System | Hexagonal system |
| Melting Temperature | 2040℃ |
| Thermal | Thermal Expansion | Parallel to C-axis:6.7*10-6 |
| Perpendicular to C-axis:5.0*10-6 |
| Specific Heat | 0.18 Cal/gm°K(25℃) |
| Mechanical | Density | 3.98-4.1g/cm3 |
| Hardness | 9 Moh's Scale |
| (Hv)≥1700kg/mm2 |
| Modulus of Elasticity | 340-380Gpa |
| Compressive Strength | 2.1Gpa |
| Tensile Strength | 0.19Gpa |
| Optical | Index of Refraction | Parallel to C-axis:1.769 |
| Perpendicular to C-axis:1.769 |
| Index of IR Transmission | 85% |
| Electrical | Electrical Resistance | ＞1016Ω/cm(25℃) |
| Dielectric Constant | 7.5-10 |
| Chemical | Erosion Resistance | Can not be corroded by adid or alkali at mormal temperature, only
can be corroded by HF at 300℃ |
Sapphire Boule Details
Basic Structure of Sapphire Boule
The composition of sapphire is alumina (Al2O3), which is formed by
covalent bonding of three oxygen atoms and two aluminum atoms. Sapphire Boule crystal structure is a hexagonal lattice structure. In terms of
color, pure alumina crystals are It is transparent and colorless.
The sapphire shows different colors due to the ion penetration of
different color elements and the growing sapphire. When titanium
ions (Ti3+) and iron ions (Fe3+) are contained in sapphire crystals
in nature, the crystals will appear and become blue sapphire (Blue
Sapphire). When the crystal contains chromium ions (Cr3+), the
crystal will appear red and become ruby (Ruby). When the crystal
contains nickel ions (Ni3+), the crystal will appear yellow and
become yellow sapphire. Sapphire crystal belongs to the
intermediate crystal family and the trigonal crystal system in the
symmetry classification of crystals.
Application of Sapphire Crystal
Sapphire has the best overall performance and has become the most
widely used oxide substrate material, mainly used as a
semiconductor thin film substrate material, large-scale integrated
circuit substrate, etc.
Sapphire crystals are also excellent window materials for infrared
military devices, missiles, submarines, satellite space technology,
detection and high-power lasers (lasers), high-quality optical
materials, wear-resistant bearing materials, etc., especially in
missile fairings, Submarine windows and atomic clocks play an
irreplaceable role in military products.
In other civilian applications, sapphire can also be used as
transparent electronic materials, lamps and windows, semiconductor
wafer carrying devices, thermal insulators, thermocouples,
ultraviolet and infrared optical windows, and gravity wave
detection instruments.
Why US?
1. We’re the rare source manufacturer of color sapphire boule, and
the most professional factory of sapphire processing, especially
the special watch case.
2. We have our own sapphire grown equipent with CZ and KY method.
3. Professional customized production according to the drawing
provided by clients.
4. Precision work of sapphire processing and polishing.
5. Experienced technicians and skilled workers.
FQA
1. Are you a trading company or factory?
We are a professional factory of sapphire products, also a trading
company .
2.Can you do customized products?
Yes, we specialized in customized production or OEM work.
CAD,3D drawing are needed.
3.Could you provide samples?
Yes, we could provide samples with a charge, but if you place the
order with a quality above 100pcs, the sample charge will be
refunded.
4.What’s the delivery time?
It depends on the type of products and the quality.
For watch case, the regular time is around 5-8 weeks for 200pcs
according to the difficulty of the processing.
5.How about the payment?
T/T payment is prefered.
6.How about the delivery?
Mostly by air, like DHL, Fedex.
