CTE (0°C; 50°C) Specification tolerances | |
Expansion Class 0: | 0 ± 0.02 · 10-6/K |
Expansion Class 1 | 0 ± 0.05 · 10-6/K |
Expansion Class 2 | 0 ± 0.10 · 10-6/K |
Tighter tolerance available upon request. |
ITEM | Zerodur | Zerodur K20 |
Thermal Conductivity (W/(m•K)) | 1.46 | 1.63 |
Thermal Diffusion (×10-4m2/s) | 0.72 | - |
Specific Heat (kJ/(kg•K)) | 0.80 | 0.90 |
Item | Unit | Zerodur | Zerodur K20 |
Density | g/cm3 | 2.53 | 2.53 |
Yong's Module | GPa | 90.3 | 84.7 |
Poisson's ratio | 0.24 | 0.25 | |
Compression strength | GPa | - | - |
Bending strength | MPa | - | - |
Tensile strength | MPa | - | - |
Torsional rigidity | GPa | - | - |
Vickers hardness | GPa | -- | - |
Knoop Hardness HK 0,1/20 (ISO9385) | - | 620 | 620 |
Abrasion Aa* | - | 56.1 | - |
Refractive index nd | - | 1.5424 | - |
Softening point | ºC | - | - |
Annealing point | ºC | - | - |
Strain point | ºC | - | - |
Specific heat(26ºC) | kJ/kgK | 2.55 | 2.55 |
Thermal conductivity ratio(26ºC) | cal/cm.sec.ºC | - | - |
Thermal conductivity ratio(100ºC) | Cal/cm.sec.ºC | - | - |
Applying Fields: | ZERODUR has become a determining factor in the performance and quality of many spectacular applications that employ modern technology: 1).Stages and mirrors for IC and LCD lithography equipment 2).Mirror substrates for segmented and large monolithic astronomical telescopes 3).Ultra light weight mirror blanks 4).Standards for precision measurement technology 5).High precision mechanical parts, e.g. ring laser gyroscope bodies |
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