Colored Sapphire Crystal Watch Case For Large-Size Processing Work
The Kyropoulos method, referred to as KY, was first proposed by
Kyropoulos in 1926 and used for crystal growth, and for a long time
thereafter, the method was used for the preparation and research of
large-size halogen crystals, hydroxides and carbonates. In the
1960s and 1970s, this method was improved by Musatov of the former
Soviet Union and applied to the preparation of sapphire
monocrystalline. The method grows a single crystal, the appearance
is usually pear-shaped, the diameter of the crystal can grow to a
size 10 to 30mm smaller than the inside diameter of the pot.
After the crystal has grown and completed the process of
disengaging from the crucible, the crystal must be slowly cooled
and cooled in the furnace, and the cooling process must be used to
anneal the crystal to eliminate the internal stress accumulated by
the crystal during the growth period, to avoid the residual
internal stress, causing the crystal to crack when cooling due to
the release stress. After annealing is complete, turn off the
heating voltage and continue to cool, and then remove the sapphire
crystals when the temperature in the furnace drops to room
temperature to continue the subsequent analysis process.
Sapphire—a material that is almost as hard as diamond—has been used
in watches for years as the crystals over the dials (in part due to
being extremely scratch-resistant). It’s not the easiest material
to work with, due to its extreme toughness. It can be difficult to
cut and mold, but boundaries are pushing by cutting blocks of it
into unique and fun shapes.Everything from traditional round cases
to tonneau, square, and even wildly unexpected shapes that resemble
car engines or jets.
The sapphire watch crystal is equipped with a glass made of
sapphire, which effectively safeguards the dial and hands against
potential shocks. The presence of sapphire crystal in your watch
signifies its possession of the highest quality glass available
today.
| Property | Specifications |
| Thickness | 0.5-200mm |
| Size Tolerance | ±0.01 |
| Edge Finish | Ground and beveled |
| Surface Quality | 40-20 scratch-dig |
| Surface Flatness | λ/4@633nm |
| Parallelism | ≤3 arc min(≤0.9mrad) |
| Clear Aperture | ＞80% of central diameter |
| Hardness(Knoop) | 1370 kg/mm2 |
| Young's modulus | 3.4*1011N/m2 |
| Thermal Limit | 22W/m/K |
| Thermal expansion coefficient | 8.4*10-6/K
|
FATURES
1. High mechanical strength: the permeable infrared window material
should have sufficient strength to withstand the high-speed
movement of the speed pressure load;
2. Good thermal stability: the permeable infrared window material
should be able to withstand the temperature shock caused by
pneumatic heating and height changes, transmission ratio and
refractive index should not change significantly with the change of
temperature;
3. Good chemical stability: through infrared window material
exposed to air, should be able to prevent the atmospheric salt
solution or corrosion gas corrosion, and not easy to moisture;
4. High optical transmission rate, must be able to effectively
transmit ultraviolet to medium infrared radiation;
5. Good optical characteristics, small optical scattering and good
uniformity of refractive index;
Meets large window requirements.
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.
