Zerodur glasses

Berezhinsky et al. used SMS to measure the effects of thermal annealing on bulk and interface properties of ZERODUR glass ceramics [67]. ZERODUR is used as the mirror substrate for large-scale telescopes. Components of devices made of ZERODUR can be connected by diffusion welding using an aluminium film of lOOnm thickness. This film is then annealed. The performance of the weld depends on chemical and physical phenomena occurring at the aluminium-ZERODUR... 

The Zerodur glass-ceramic, whose coefficient of linear thermal expansion at room temperature can be kept at < 0.05 x 10 /K (Table 3.4-19), was especially developed for the production of large mirror blanks for astronomical telescopes. Zerodur has further applications in optomechanical precision components such as length standards, and mirror spacers in lasers. With... 

The following formula is used by Petzoldt and Pannhorst (1991) and Petzoldt (1967) to describe the main crystal phase of the P-quartz solid solution type found in the Zerodur glass-ceramic ... 

The main crystal phase of the Zerodur glass-ceramic is composed of P-quartz solid solution This phase is produced by volume crystallization. Special thermal properties devdop as a result of the formation of very small crystallites and the simultaneous high crystallite count per unit of glass volume. 

Figure 4-11 Linear thermal expansion as a function of temperature of Zerodur glass-ceramic (Zerodur information 1991).

The Zerodur glass-ceramic is produced with a base glass of 57.2 wt% Si02, 25.3 wt% AI2O3... 

T.A. Marx Advanced Processing of Zerodur , Glass Ceramic, Proc. SPIE 1535 (1991)... 

S.F. Jacobs, D. Bass Improved dimensional stability of Corning 9600 and Schott Zerodur glass ceramics , Appl. Opt. 28, 4045-4047 (1989)... 

This statement is supported by contracts placed by ESO with CORNING, SCHOTT, and LZOS for the serial production of segments blanks in ULE (Ultra-Low Expansion glass), Zerodur and Astro-SitaU, respectively. 

Li20-Si02 (LAS). The trade names of such glass-ceramic matrix materials are Corningware, Zerodur and Ceran. This type of glass-ceramic matrix material has nearly zero thermal expansion and high thermal shock resistance. It is used for the production of optical and telescopic mirrors. 

The low-expansion spodumene-eucryptite glass-ceramics are manufactured under the trade mark Pyroceram (with a numerical code), Cer-Vit, Hercuvit (USA), Sitall with a numerical code (USSR), Heatron, Neoceram, Miraclon (Japan), Jena 2000 Zerodur (FRG). 

Properties Pyroceram Pyroceram Starting glass for Pyroceram Zerodur... 

Schott produced an 8.2-m-diameter telescope blank from a glass-ceramic ZERODUR , which had been introduced in 1968. 

Optical glasses (Zerodur) for high-precision customized lenses (Fan et al. 2009)... 

Table3.l -19 Coefficient of linear thermal expansion a, density, and elastic properties of Zerodur and Ceran glass-ceramics...

Mirrors. X rays can be focussed by letting the radiation impinge under grazing incidence upon a very smooth surface which is slightly bent. The material from which the mirror is made used to be special types of glass such as Zerodur or fused quartz but the tendency is to start using single crystal Si mirrors since these have... 

Zerodur. Trade-name. A transparent glass-ceramic with very low thermal expansion. (Jenaer Glaswerk Schott u. Gen, Mainz). 

The compositions of P-quartz solid solution glass-ceramics produced on a large scale for technical applications are summarized in Table 2-7. These glass-ceramics are called Vision , Zerodur , Narumi , Neoceram , Ceran , and Keraglas . Other products are Robax , which represents a col-... 

Honess H., Jacobson A., Knapp K., Marx T, Morian H., Muller R., Reisert N. and Thomas A., "Production of ZERODUR in Special Shapes" pp. 143-83 in Low Thermal Expansion Glass-Ceramics. Edited by H. Bach. Springer, Berlin, Heidelberg, Germany, 1995. 

Pannhorst W, "Low-Expansion Glass-Ceramics—Review of the Glass-Ceramic Ceran and Zerodur and Their Application" pp. 267—76 in Ceramic Transactions, Vol. 30, Nucleation and Crystallization in Liquids and Glasses. Edited by M.C. Weinberg. American Ceramic Society, Westerville, OH, 1993. 

W. Pannhorst Response of the glass ceramic Zerodur to simulated and actual space radiation , submitted Proc. XVII Int. Cong. Glass, Beijing, Oct. 

W. Pannhorst, W. Semar Sintered Zerodur bodies with complex shapes , Proc. 4th Int Symp. New Glass New Glass Forum Tokyo, 127-128 (1993)... 

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