Space-based optics Astrositall / Sitall CO-115M / Zerodur round part

Description: SITALL СО-115М is a crystalline glass ceramic material with ultra low Coefficient of thermal expansion.SITALL СО-115М is an ideal material to be used for manufacturing of astronomical telescopes mirrors and other optical parts that require linear dimensions and surface figure stability at significant temperature changes for example lasers.Thermal stability of SITALL СО-115М material enables the fabrication of high precision mirrors within quicker time of treatment process since testing measurements are able to be conducted not waiting until thermal equilibrium is achieved. Dimensions: Diameter: 140 mm (5.51")Thickness: 12 mm (0.47")Its polished and has facets around Wikipedia info: Sitall (also known as Sitall CO-115M or Astrositall) is a crystalline glass-ceramic with ultra-low coefficient of thermal expansion (CTE). It was originally manufactured in the former Soviet Union and was used in the making of primary mirrors for the Russian Maksutov telescopes, but since dissolution has diminished in quality. It has a CTE of only 0 ± 1.5×10−7 °C−1 in the temperature range −60 to 60 °C, placing it in a small group of transparent materials with low CTE such as Vycor, Zerodur, Cer‑Vit and fused quartz. Materials of low coefficient of thermal expansion are critical in the manufacture of optical elements for telescopes. In segmented mirror telescopes, it is desirable to have this coefficient as near zero as possible, and to have a high degree of homogeneity in the material. The Southern African Large Telescope (SALT) selected Sitall for the manufacture of its 91 primary mirror segments by Lytkarino Optical Glass Plant. The choice arose out of increased scientific collaboration between Russia and South Africa since 1994.[3][4][5] Sitall was also used for the primary and secondary mirrors of the VLT Survey Telescope. Sitall glass in jewelry use: The time of high technologies and incredible scientific achievements leaves few people annoyed, giving the world unique gadgets and revolutionary new electronics. However, when it comes to jewelry, it can be difficult for people to look at familiar things from a completely different angle. Let's dispel illusions together about the most provocative insert of our time - nanosital. Nanosital, or sitall, is a unique material consisting of the main components of natural jewelry stones - SiO2 and Al2O3, with the only difference that it is synthesized in the laboratory. Thus, scientists create real miracles by adding various combinations of these oxides with their own hands! It turns out a kind of jewelry "puzzle" that repeats natural minerals in all chemical and physical parameters. By its properties sitall is closest to natural topaz. Crystal clarity and a wide range of possible colors provide an unparalleled ability to recreate virtually all colored semi-precious and even precious stones. Separately, it is worth noting the optical performance of glass-ceramic. Unlike other non-natural inserts, the luster and color of glass-ceramic is impeccable even in large samples. If you are really good at jewelry stones, you will never allow yourself to call sitall "glass". Unlike glass, glass-ceramic has exceptional properties: • Unrivaled brilliance and clarity, while glass loses its original appearance over time, ceases to refract the sun's rays, becomes cloudy, worn and extremely unaesthetic. • Wide palette of colors. • High hardness, density and wear resistance, while glass has an extremely low hardness on the Mohs scale. With frequent wear of glass, this results in deformation of the cut: rounding of corners, scratches and a decrease in optical properties. • Acceptable price. Sitall combines all the best that is in natural inserts and eliminates the disadvantages of low-quality analogues of natural stones. Recall that nanositoll was created by scientists from oxides, which are components of natural natural stones. It cannot be called a simple "glass", because it repeats natural natural gems in all physical and chemical parameters. It combines the best properties of natural stones: the color and brilliance are impeccable even in large specimens. When simple glass is rubbed over and becomes cloudy over time, sitall retains crystal transparency even after 10 years;the color of the crystal depends on the dye that is added during the manufacturing process. Sitalls are not limited in shades, this is a significant advantage;crystals have high density, hardness and wear resistance. In terms of strength, they compete with the best grades of steel. These are durable jewelry inserts, they are scratch-resistant and retain their original appearance when jewelry is actively worn. Ordinary glass has low hardness indicators, this manifests itself in the form of scratches and a decrease in optical properties if jewelry with a “glass” is often worn. IN SCIENTIFIC INDUSTRIES Science has not stopped at the possibility of giving the substance the desired color. At this point, there are already ways to distribute zones with certain optical parameters in the material. This property, combined with strength and wear resistance, made sital glass an ideal material for the manufacture of complex space optics. Its resistance to destructive factors of a physical, chemical and thermal nature could not fail to interest specialists in those areas where a high level of protection against such influences is required. In the construction of aviation and rocket technology, this material is used to make the front part of the apparatus, the head fairing, which is necessary to overcome air resistance and accelerate flight. In the oil refining industry, glass-ceramic pipes are used. The glass-ceramic layer is used to cover the metal parts of cars. Glass-ceramic is also used in the production of household items - it is used to cover electric stoves, pans, and pots. On the basis of sitall, building materials of increased strength are created, for example, glass marble. Dental crowns and bone prostheses are made from it. Improvement of glass-ceramic production technology, meanwhile, continues. Probably, in the near future, humanity will hear about its new properties.

Price: 280 USD

Location: Vinnitsa

End Time: 2024-02-10T13:56:18.000Z

Shipping Cost: 20 USD