Blue Color Sapphire Watch Case For Luxury Brand
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.
FATURES
- High transmittance
- High mechanical strength
- High temperature resistance
- Scratch resistance
- Abrasion resistance
- Customized shape
- Optional color
| 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 |
These excellent optical, mechanical, thermal, chemical and
electrical properties determine its important position and role in
the military and civilian fields.
(1) Chemical stability: Sapphire has a high degree of chemical
stability and will not be corroded during most chemical reactions.
(2) Mechanical properties: Due to its high hardness and high
strength, sapphire single crystal can maintain high strength, wear
resistance and high stability in different environments ranging
from ultra-low temperature to 1500 ℃ high temperature. At the same
time, it is the oxide crystal material with the highest hardness
currently known, second only to diamond up to 9 on the Mohs scale.
(3) Optical transmittance: The penetration wavelength range of
sapphire single crystal material is 0.19nm-5.5nm, coupled with its
excellent chemical stability, abrasion resistance, high hardness
and high temperature resistance, make the windows made of sapphire
and Sensor optical parts are widely used in high vacuum systems,
high temperature furnaces and other harsh environments.
(4) Thermodynamic properties: The melting point of about 2050°C,
coupled with superior chemical, mechanical and optical properties,
make sapphire crystals widely used in many harsh processing
environments.
(5) Wear resistance: Because of its high hardness and transparency,
sapphire crystals are often used to make wear-resistant windows or
other precision mechanical parts.
(6) Dielectric properties: dielectric insulation and constant
dielectric constant.
(7) Sapphire also has high tensile strength, erosion resistance,
thermal conductivity, and remarkable thermal shock resistance.
