Material - Aluminium (Al)
Aluminum has a high reflectance over the entire visible and near infrared spectrum.
Aluminum coatings have a good reflectance in the UV spectral range and high reflectance over visible and near infrared spectrum. Aluminium coating reflectance is higher than silver coating reflectivity in UV spectral range.
Crystaltechno Ltd manufactures optics (mirrors and prisms) with Al coatings. Substrate material – different glass (including pyrex), fused silica, zerodur, sitall or astrositall etc.
Besides we cover optics substrates according to customer’s specification. Crystaltechno Ltd produces chemically pure aluminum coatings with protective layer (SiO2 or MgF2) in high temperature vacuum chambers. Please send your inquiry.
BASE PROPERTIES
|
PARAMETER |
|
VALUE |
|
|
|
|
|
|
| OPTICAL |
|
| |
Termal Radiation Coefficient |
|
0.04 … 0.06 at 323 … 773 K |
| PHYSICAL |
|
| |
Density |
|
2.7 g/cm3 at 293 K |
|
| |
Melting Point |
|
933 Ę |
|
| |
Heat of Melting |
|
322 ... 394 kJ/kg |
|
| |
Thermal Conductivity |
|
225 Wm-1K-1at 293K |
|
| |
Thermal Expansion |
|
18.85 x 10-6/°C |
|
| |
Hardness |
|
Knoop 158.3 kg/mm2 (100) |
|
| |
Specific Heat Capacity |
|
854J/(kg K) |
|
| |
Brinell Hardness |
|
167 MPa |
|
| |
Young's Modulus (E) |
|
71 GPa |
|
| |
Shear Modulus (G) |
|
26 GPa |
|
| |
Resistivity |
|
2.66 x 10-6 Ohm x cm at 293 K |
|
| |
Poisson Ratio |
|
0.26 |
|
REGULAR REFLECTANCE
| |
Wavelength, µm |
0.76 |
1,0 |
2.0 |
3.0 |
4.0 |
10.0 |
|
| |
Regular Reflectance |
0.72 |
0.75 |
0.86 |
0.91 |
0.92 |
0,98 |
|
|
