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Zerodur

Material

ZERODUR® uniquely combines the properties of glass and ceramics, making it ideal for high-precision applications in research and development.

Developed by Schott AG in 1956, it has since proven itself in use under extreme conditions, such as those prevalent in astronomy.
Der glaskeramische Werkstoff wird unter kontrollierter Volumenkristallisation hergestellt und die daraus resultierende Restglas- und kristalline Phase bestimmen das außergewöhnliche Werkstoffverhalten.

ZERODUR® is characterized by good material homogeneity, chemical resistance and long-term stability.

 

A special feature is zero expansion with temperature fluctuations and, as a result, hardly any fluctuating mechanical properties.
Diese Besonderheiten machen ZERODUR® u.a. ideal als Substratmaterial optischer Elemente in Kometensonden, als Spiegelträger für astronomische Groß-Teleskope und weitere Anwendungen der Präzisionsoptik und Messtechnik.

Properties
Optical and spectral properties
Refractive index
nd= 1.5424
Abbe number
νd= 56,1
Optimum transmission range
400-1250 nm
Transmittance @ 580 nm
5 mm thickness
0,95
10 mm thickness
0,90
Stress optical coefficient K @ 589.3 nm
3,0*10-6 MPa-1
Physical properties
Coefficient of thermal expansion 1/
0,1-0,02*10-6
Density ρ [g/cm3]
2,53
Thermal diffusivity index a at 20 °C in m²/s
0,72*10-6
Heat capacity cp at 20 °C [J/(g - K)]
0,80
Modulus of elasticity E at 20 °C [GPa] - mean value
90,3
Poisson's ratio
0,24
Knoop hardness HK 0.1/20 (ISO9385)
620
Electrical resistance ρ at 20 °C [Ω - cm]
2,6 · 1013
Tk100 [°C], temperature for ρ = 108 [Ω - cm]
178
Maximum processing temperature
600 °C
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