Large size Sapphire crystals up to 150-200mm boule are available, As the hardest of all oxide crystals, Sapphire has a combination of optical and physical properties that make it the best choice for a variety of demanding applications.Sapphire maintains its strength even at high temperature.It has good thermal properties, excellent electrical and dielectric properties and is resistant to chemical attack.These properties encourage the use of Sapphire in aggressive environments where reliability, optical transmission and strength are required.
1.Applications
1).UV and IR optics windows for high temperature and pressure, corrosion resistance, abrasion resistance heat sinders and thermo couplers; 2).semiconductor wafer carriers electrical insulators thin film deposition transparent electronic substrate silicon on sapphire wafers;
2.Superconductor Substrate Basic Properties
Crystal structure
Hexagonal System
Lattice
a=4.785Å C=12.991Å/font>
Density
3.98g/cm3
Transmission Range
150-5500nm
Melting Point
2040
Specific Heat
0.418 W.s/g/K
Thermal Conductivity
25.12 W/m/K
Thermal Shock Resistance
790 W/m
Thermal Expansion Coefficient
5.8x10-6/K
dn/dt, @633nm
13x10-6/K
Hardness
9 Mohs
Refractive Index
1.83 @0.26mm, 1.76 @0.63mm, 1.58 @5.57mm
3.Sapphire's Main Specification
Diameter
＼0.0, -0.1mm
Thickness
＼0.1mm
Flatness
<Lambda/2 @633nm
Parallelism
< 3 Arc minutes
Perpendicularity
<5 Arc minutes
Surface Quality
80/50 Scratch-Dig per MIL-O-13830A
Wavefront Distortion
<Lambda/2 per inch(@1064nm)
Other high-precision Sapphire Windows, AR-and HR coatings are available upon request. Sapphire boule grown by CZ method and as-cut Sapphire blocks are also available.
