Categories | Convex Sapphire Glass |
---|---|
Brand Name: | Tianzhili |
Place of Origin: | Guangdong, China (Mainland) |
Model Number: | customized |
Price: | US $4.50 |
Material: | sapphire |
Size: | 1-200mm |
Shape: | custom shape |
Feature: | 9H Hardness |
Surface treatment: | Polish |
Service: | OEM,ODM |
Coating: | AR-Coating |
Application: | watch glass |
AR - Coating Polish Convex Sapphire Glass Ground And Beveled Edge
Finish
Product Description
Thermal Properties | Mechanical Properties | ||
---|---|---|---|
Thermal Coefficient of Expansion | (0/300°C): 45-53 X 10 -7/°C | Density | 3.97 g/cm3 |
Annealing Point | N/A | Knoop Hardness | 1525-2000 Kg/mm2 |
Softening Point | 2040°C / 3700 °F | Young's Modulus | 50-55X106 psi / 345 GPa |
Strain Point | N/A | Poisson's Ratio | .28-.33 |
Chemical Properties | Electrical Properties | ||
---|---|---|---|
Hydrolytic Resistance | N/A | Dielectric Constant | Avg. 9.3-11.5 |
Acid Resistance | N/A | Resistivity | N/A |
Alkali Resistance | N/A | Dielectric Strength | 4.8X105 v/cm |
Sapphire crystal is more reflective than mineral crystal due to its
higher index of refraction. (1,8 compared to 1,47). Applying one or
more layers of AR (anti-reflective) coating will limit this
reflection to a very low level. Very often, lines and marks on the
top surface of a sapphire crystal are mistaken for scratches but
are actually the scratched AR coating, or just AR coating wearing
off after time. An AR coating on the inside of the crystal provides
a good AR performance while avoiding this problem. If you do
scratch a sapphire crystal, then it cannot be polished away and
will need to be replaced.
Property | Specification |
Thickness | 0.5-50mm |
Size tolerance | 0.02mm |
Edge Finish | Ground and beveled |
Surface Quality | 40-20 scratch-dig |
Surface Flatness | λ/4 @ 633 nm |
Parallelism | ≤3 arc min (≤0.9 mrad) |
Clear Aperture | >80% of central diameter |
Hardness (Knoop) | 1370 kg mm-2 |
Young's modulus | 3.4 x 1011 N m-2 |
Thermal Limit | 22 W m-1 K-1 |
Thermal expansion coefficient | 8.4 x 10-6 K-1 |
Overview of Synthetic Sapphire
Synthetic sapphire (Corundum or Al2O3) single crystal is a highly trusted material with its excellent
chemical stability, mechanical property, and light transmission. It
is often used in aggressive environments where reliability, optical
transmission and strength are required.
Applications of Synthetic Sapphire
Properties of Synthetic Sapphire
Synthetic sapphire is the hardest of all known oxide crystals with a 9 on the Mohs
scale. Synthetic sapphire is second in hardness only to diamond,
and retains its high strength at high temperatures. Synthetic sapphire crystals have good thermal properties, with excellent electrical and
dielectric properties. In addition, synthetic sapphire combines
zero porosity with near total resistance to acids and alkaline
substances. Synthetic sapphire is insoluble in watch, and only
reacts with hydrofluoric acid, phosphoric acid and potassium
hydroxide at high temperature of above 300 degree Celsius.
Stanford Materials has been a provider of many kinds of synthetic
sapphires, including sapphire wafers, sapphire lenses, sapphire substrates, watch glasses, and sapphire boule for many years. Synthetic sapphire is anisotropic hexagonal
crystal. Its properties depend on crystallographic direction
(relative to the optical C-axis). Our synthetic sapphire wafers are
generated using the latest technology to maximize quality and
transmittance. Because of our product’s quality, you can trust that
it is your best choice for a variety of demanding applications.
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