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What is ZERODUR tm?

What is ZERODUR tm?

Zerodur (notation of the manufacturer: ZERODUR®), a registered trademark of Schott AG, is a lithium-aluminosilicate glass-ceramic produced by Schott AG since 1968.

How is fused quartz made?

Fused quartz is produced by fusing (melting) high-purity silica sand, which consists of quartz crystals. Type II is produced by fusing quartz crystal powder in a high-temperature flame. Type III is produced by burning SiCl4 in a hydrogen-oxygen flame.

Why is Monel good for shipbuilding?

Stronger than pure nickel, Monel alloys are resistant to corrosion by many agents, including rapidly flowing seawater. They can be fabricated readily by hot- and cold-working, machining, and welding. Monel was created in 1905 by Robert Crooks Stanley, who at the time worked the International Nickel Company (Inco).

Does solder have nickel in it?

Copper plated with nickel and gold is often used. The thin gold layer facilitates good solderability of nickel as it protects the nickel from oxidation; the layer has to be thin enough to rapidly and completely dissolve so bare nickel is exposed to the solder.

Why is the transmittance of Zerodur so low?

Zerodur has a low transmittance relative to most glasses. This is due to the two-phase structure of Zerodur; light undergoes Rayleigh scattering by the embedded crystals. However, it does have relatively high transmittance in the 3 – 4 μm range (the L band in infrared astronomy), which could make it a candidate for certain IR applications.

What are the properties of the material Zerodur?

Zerodur is a glass-ceramic material with an extremely low CTE ( α ~ 0.05 x 10-6), but otherwise exhibits most of the properties of a mormal glass, with the exception of its transmittance. It is extremely homogeneous and temporally stable.

What makes Zerodur glass different from other glass materials?

Unlike most glass materials, ZERODUR ® has an extremely low coefficient of thermal expansion (CTE) that even can become zero or slightly negative at some temperatures. The expansion is also much smaller than the one of quartz glass or fused silica. Another unique characteristic of ZERODUR ® is its high homogeneity.

How is the refractive index of Zerodur determined?

Unlike optical glass the refractive index of ZERODUR®can not be adjusted to tighter tolerances by a subsequent annealing process. The standard measurement accuracy for the refractive index is ±3*10-5and covers the g- to C-line. Using a special spectrometer a refractive index measurement accuracy of ±0.4*10-5