Zerodur (notation of the manufacturer: ZERODUR®), a registered trademark of Schott AG, is a lithium-aluminosilicate glass-ceramic produced by Schott AG since 1968. It has been used for a number of very large telescope mirrors including GTC, Keck I, Keck II, and SOFIA, as well as some smaller telescopes (such as the GREGOR Solar Telescope). With its very low coefficient of thermal expansion (CTE) it can be used to produce mirrors that retain acceptable figures in extremely cold environments such as deep space. Although it has advantages for applications requiring a coefficient of thermal expansion less than that of borosilicate glass, it remains very expensive as compared to borosilicate. The tight tolerance on CTE, ±0.007×10−6 K−1, allows for its use in high-precision applications.
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| - Zerodur (de)
- Zerodur (fr)
- Zerodur (it)
- ゼロデュア (ja)
- Zerodur (en)
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| - Zerodur (Schreibweise des Herstellers: ZERODUR®) ist ein glaskeramischer Werkstoff der Schott AG, der durch kontrollierte Volumenkristallisation hergestellt wird. (de)
- Le Zerodur est un verre de type vitrocéramique inventé en 1968 par le producteur de verres Schott AG à la suite d'une commande spécifique de l'Institut Max-Planck d'astronomie à Heidelberg en Allemagne. Son coefficient de dilatation est presque nul et excellemment homogène dans l'ensemble de la matière. Le Zerodur est employé pour les substrats de miroirs nécessitant une très grande stabilité thermique, la plupart des miroirs de télescope actuels de diamètre de 4 mètres, et de 8 à 10 mètres sont en Zerodur. Les inclusions présentes dans le Zerodur interdisent son emploi pour la transmission optique. (fr)
- ゼロデュア（独:Zerodur ）はドイツのショットが開発した低膨張の光学材料である。ガラスセラミックス複合素材で非晶質の基材と結晶質の分散材により構成される。異なる膨張係数を持つ材料を混合することにより、常温付近の膨張率を減らした素材である。 (ja)
- Zerodur (notation of the manufacturer: ZERODUR®), a registered trademark of Schott AG, is a lithium-aluminosilicate glass-ceramic produced by Schott AG since 1968. It has been used for a number of very large telescope mirrors including GTC, Keck I, Keck II, and SOFIA, as well as some smaller telescopes (such as the GREGOR Solar Telescope). With its very low coefficient of thermal expansion (CTE) it can be used to produce mirrors that retain acceptable figures in extremely cold environments such as deep space. Although it has advantages for applications requiring a coefficient of thermal expansion less than that of borosilicate glass, it remains very expensive as compared to borosilicate. The tight tolerance on CTE, ±0.007×10−6 K−1, allows for its use in high-precision applications. (en)
- Zerodur è un materiale in vetroceramica realizzato dalla Schott AG. Ha una struttura molecolare sia amorfa (o vetrosa), sia cristallina. Questa composizione le conferisce importanti proprietà come:
* Coefficiente di dilatazione termica prossimo a zero (≈ 0,2×10−7K−1 a 0–50 °C) con omogeneità spaziale molto stabile sui tre assi.
* Buon comportamento alla lavorazione meccanica.
* Può essere lucidato con un livello di precisione molto elevato.
* Può essere facilmente rivestito con altri materiali
* Bassa permeabilità all'elio
* Porosità nulla
* Buona stabilità chimica (it)
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| - Zerodur (Schreibweise des Herstellers: ZERODUR®) ist ein glaskeramischer Werkstoff der Schott AG, der durch kontrollierte Volumenkristallisation hergestellt wird. (de)
- Le Zerodur est un verre de type vitrocéramique inventé en 1968 par le producteur de verres Schott AG à la suite d'une commande spécifique de l'Institut Max-Planck d'astronomie à Heidelberg en Allemagne. Son coefficient de dilatation est presque nul et excellemment homogène dans l'ensemble de la matière. Le Zerodur est employé pour les substrats de miroirs nécessitant une très grande stabilité thermique, la plupart des miroirs de télescope actuels de diamètre de 4 mètres, et de 8 à 10 mètres sont en Zerodur. Les inclusions présentes dans le Zerodur interdisent son emploi pour la transmission optique. (fr)
- ゼロデュア（独:Zerodur ）はドイツのショットが開発した低膨張の光学材料である。ガラスセラミックス複合素材で非晶質の基材と結晶質の分散材により構成される。異なる膨張係数を持つ材料を混合することにより、常温付近の膨張率を減らした素材である。 (ja)
- Zerodur (notation of the manufacturer: ZERODUR®), a registered trademark of Schott AG, is a lithium-aluminosilicate glass-ceramic produced by Schott AG since 1968. It has been used for a number of very large telescope mirrors including GTC, Keck I, Keck II, and SOFIA, as well as some smaller telescopes (such as the GREGOR Solar Telescope). With its very low coefficient of thermal expansion (CTE) it can be used to produce mirrors that retain acceptable figures in extremely cold environments such as deep space. Although it has advantages for applications requiring a coefficient of thermal expansion less than that of borosilicate glass, it remains very expensive as compared to borosilicate. The tight tolerance on CTE, ±0.007×10−6 K−1, allows for its use in high-precision applications. (en)
- Zerodur è un materiale in vetroceramica realizzato dalla Schott AG. Ha una struttura molecolare sia amorfa (o vetrosa), sia cristallina. Questa composizione le conferisce importanti proprietà come:
* Coefficiente di dilatazione termica prossimo a zero (≈ 0,2×10−7K−1 a 0–50 °C) con omogeneità spaziale molto stabile sui tre assi.
* Buon comportamento alla lavorazione meccanica.
* Può essere lucidato con un livello di precisione molto elevato.
* Può essere facilmente rivestito con altri materiali
* Bassa permeabilità all'elio
* Porosità nulla
* Buona stabilità chimica (it)
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