Polished Blue Sapphire Crystal Watch Case For Custoized Movement
Czochralski method, or CZ method for short. First heating the raw
material to the melting point and then melting to form a melting
soup, and then using a single crystal seed to contact the surface
of the melting soup, in the crystal seed and the solid liquid
interface of the melted soup due to the temperature difference and
formed too cold. So the melted soup began to solidify on the
surface of the seed and grow a single crystal with the same crystal
structure as the seed. The seed is also pulled up at a very slow
speed, and accompanied by a certain speed of rotation, with the
upward pull of the seed, the melt soup gradually solidified on the
liquid solid interface of the seed, and then formed a axis of
symmetrical single crystal ingot.
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.
| 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.
