The hottest zero expansion glass ceramics become a

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Zero expansion microcrystalline glass becomes an ideal material for large telescopes at semicon semiconductor exhibition in Tokyo, Japan this month, Bartel, the international glass giant German Schott exhibition, also continued to cooperate with the US based biont polymers company to produce a large telescope blank with a weight of two tons and a diameter of 1.6 meters, which attracted the attention of the media and the industry

making this kind of difficult mirror blank mainly relies on a kind of glass ceramics called "zerodur" produced by Schott

since 1986, "zerodur" has been the preferred material for the extra large lens blank of astronomical telescope. Its near zero thermal expansion performance ensures that the material will not deform in the operating temperature of -10 ° C to 35 ° C. It is one of the most important components of LCD lithography machine and is widely used in the manufacture of LCD screens for photographic cameras, computers and televisions. "Zerodur" is positioned in large projects and cyclical industries. Its market operation is very flexible. Therefore, it has high requirements for manufacturers. As a high-tech multinational enterprise, Schott has strong R & D strength and flexible working methods, and can be competent for many professional tasks with very demanding requirements and meet the needs of many customers

according to Dr. Thomas Westerhoff, the director of Schott group in charge of the production of "zerodur" glass ceramics, "since 2003, our investment in expanding and adjusting the production facilities of glass ceramics has exceeded 15million euros. A large amount of investment has greatly improved our melting, technology, quality and technology. At present, this product has become more and more influential in the world, and its competitiveness is beyond doubt". The person in charge also said, "it depends on various resources and proprietary technologies in different fields provided by the production base of Mainz headquarters in Germany, which not only enhances our innovation ability, but also has the flexibility to ensure the success of the project. Schott is ready to go and is ready to provide services to" zerodur "customers from all over the world."

Dr. Westerhoff further added that Schott can meet the professional needs of global customers for "zerodur" and provide solid quality assurance. In Schott's view, they are the only manufacturers in the market that can provide products for other industrial and astronomical projects when customers' orders are completed on schedule

"according to the current plan, the first batch of" zerodur "lens blanks for the new project" super large telescope "are expected to be delivered in 2009"

according to Dr. Westerhoff, Schott is expected to build a telescope blank with a mirror diameter of about 30 meters and 500 lenses in the United States. In addition, the "European super large telescope" of the European Southern Observatory will be composed of more than 900 hexagonal lenses with a diameter of 42 meters. In addition, Schott also actively participated in China's projects, such as Lijiang telescope at Yunnan Observatory after all the work is completed. According to Li Yan, director of Yunnan Observatory, "Lijiang telescope has nearly perfect optical quality. It is the largest optical telescope in China so far and one of the largest optical general-purpose telescopes in East Asia." In China, Schott also provided "zerodur" glass ceramics for l0.36 ~ 0.40amost large sky area multi-target optical fiber spectrum telescope. After the completion of this telescope, it will become the telescope with the highest spectral acquisition rate in China. In addition to the astronomy projects launched and planned to be launched in China, Schott has similar projects and plans in Japan and the United States

for many years, Schott, as a research and development partner, has been cooperating with international research institutions, exchanging experience and expertise. "Zerodur" is an ideal material for large telescopes that are being planned and constructed by countries all over the world. Dr. Westerhoff emphasized that "this kind of glass ceramics has very low coefficient of thermal expansion and excellent chemical stability." In addition, Dr. Westerhoff added, "zerodur can be mass produced and has high quality that can be remanufactured. It is easy to carry out processing procedures, polishing and coating. The weight of the new lens blank of the lightweight and honeycomb mechanism produced by Schott will be reduced by as much as 80% after CNC processing."

1968, "zerodur" came into being with the astronomical project, one year earlier than the first human landing on the moon. Since then, "zerodur" has become the preferred material for astronomical telescopes to explore the vast universe. The European Southern Observatory, which has attracted worldwide attention, has four primary mirror blanks with a diameter of more than 8 meters, which are produced by Schott

in addition, "zerodur" glass ceramics are also used to manufacture various industrial products. Its excellent zero thermal expansion makes it the most ideal reference standard in measuring equipment. Other products include micro lithography technology and precision components of ring laser gyroscope. Cylindrical lens and other products are used in LCD lithography machines to manufacture LCD screens for computers and flat TVs

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