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Schott ZERODUR® K20 Glass Ceramic
Categories: Ceramic; Glass; Optical

Material Notes: The high temperature ZERODUR® K2 glass ceramic material contains a crystal phase of more than 90% Keatite, produced by thermal transformation from the semitransparent ZERODUR® material. ZERODUR® K20 can be used at higher application temperatures compared to ZERODUR®. The material has high temperature stability and low thermal expansion and does not change its properties during multiple temperature cycles.

Properties

  • Low coefficient of thermal expansion together with high long term temperature stability up to 850°C
  • Can be matched with low thermal Expansion metal alloys, e. g. Invar®
  • Excellent homogeneity and internal quality
  • A transmission of more than 90% in the visible with a matte brilliant white finish
  • Free of pores and polishable to very low surface roughness levels
  • Large-scale parts can be produced with dimensions in the meter range
Applications
  • Mechanical and optical components within high energy laser systems
  • Diffuse reflectors for laser-cavities
  • Mold material in hot forming processes (glass, plastic etc.)
  • High precision manufactured components
  • Ceramic engine components
  • Calibration standards for optical and mechanical probes

Information provided by SCHOTT.

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Physical PropertiesOriginal ValueComments
Density 2.53 g/cc
 
Mechanical PropertiesOriginal ValueComments
Hardness, Knoop 6200.1/20
Modulus of Elasticity 84.7 GPa
Poissons Ratio 0.25
Shear Modulus 33.9 GPaCalculated
 
Thermal PropertiesOriginal ValueComments
CTE, linear 1.60 µm/m-°C
@Temperature 0.000 - 50.0 °C
 2.20 µm/m-°C
@Temperature 20.0 - 300 °C
 2.40 µm/m-°C
@Temperature 20.0 - 700 °C
Specific Heat Capacity 0.900 J/g-°C
Thermal Conductivity 1.63 W/m-K
Maximum Service Temperature, Air 850 °C

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