{"id":24903,"date":"2017-03-02T12:13:34","date_gmt":"2017-03-02T11:13:34","guid":{"rendered":"http:\/\/www.expo21xx.com\/news\/?p=24903"},"modified":"2017-03-01T14:16:22","modified_gmt":"2017-03-01T13:16:22","slug":"schotts-glass-ceramic-production-fit-future","status":"publish","type":"post","link":"https:\/\/www.expo21xx.com\/news\/schotts-glass-ceramic-production-fit-future\/","title":{"rendered":"Schott\u00b4s Glass-ceramic production is fit for the future"},"content":{"rendered":"<div id=\"attachment_24904\" class=\"wp-caption alignright\" style=\"width: 300px\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-24904\" src=\"http:\/\/www.expo21xx.com\/news\/wp-content\/uploads\/schott-future.jpg\" alt=\"\" width=\"300\" height=\"191\" srcset=\"https:\/\/www.expo21xx.com\/news\/wp-content\/uploads\/schott-future.jpg 300w, https:\/\/www.expo21xx.com\/news\/wp-content\/uploads\/schott-future-149x95.jpg 149w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><p class=\"wp-caption-text\">At SCHOTT, another glass melting tank was put into operation for the production of glass ceramics: Christoph Fark\/Executive Vice President of Advanced Optics, Herman Ditz\/Member of the SCHOTT Board, Ralf Reschke, Dr. Thomas Westerhoff, Ludwig D\u00fcrsch and Christopher Klein (from left).<i>Photo by SCHOTT AG<\/i><\/p><\/div>\n<p><strong>With a state-of-the-art melting tank for ZERODUR\u00ae glass-ceramic production, SCHOTT is now building up\u00a0its production capacities in Mainz to ensure customers reliable delivery<\/strong><\/p>\n<p>At SCHOTT, another glass melting tank was put into operation for the production of glass ceramics: Christoph Fark\/Executive Vice President of Advanced Optics, Herman Ditz\/Member of the SCHOTT Board, Ralf Reschke, Dr. Thomas Westerhoff, Ludwig D\u00fcrsch and Christopher Klein (from left).<br \/>\nAt SCHOTT, another glass melting tank was put into operation for the production of glass ceramics: Christoph Fark\/Executive Vice President of Advanced Optics, Herman Ditz\/Member of the SCHOTT Board, Ralf Reschke, Dr. Thomas Westerhoff, Ludwig D\u00fcrsch and Christopher Klein (from left).<br \/>\nWhen a melting tank is put into operation in the glass industry, it is a special milestone. After planning and months of construction, the tank starts\u00a0a journey that will last several years during which the melting unit, in order to be economically viable, must sustain full power and withstand great stress at high temperatures. The SCHOTT technology group has now \u201cfired up\u201d (as insiders call the official start of operation) a new glass melting tank for ZERODUR\u00ae glass-ceramic production at its Mainz site. <em>\u201cThe second tank reserved exclusively for ZERODUR\u00ae glass-ceramic is designed to meet the material\u2019s long-term high demand and to contribute to the success of customers. In addition, the investment in the Mainz site, our company\u2019s center of glass-ceramic expertise, will secure jobs,\u201d<\/em> said Christoph Fark, Executive Vice President of Advanced Optics at SCHOTT.<\/p>\n<p>During firing up, the burner lance of a mobile gas-air burner is directed into the completely empty tank interior and ignited. There is a special reason: <em>\u201cBefore glass can be melted, the residual moisture of the special stone-on-stone refractory material must first be removed with a tempering device and the tank must be brought to an operating temperature of at least 1,000 degrees Celsius,\u201d<\/em> explains the responsible engineer and project manager Thomas Lifka. Only then can the actual glass melt begin in the new tank. The pre-mixed raw materials \u2013 in the case of ZERODUR\u00ae, mainly silicon, aluminum and lithium \u2013 are introduced into the pre-heated tank over a period of several days and brought to melting temperatures of more than 1,600 degrees Celsius using a combination of electric and fossil heating.<\/p>\n<p>Tank production expert Lifka: <em>\u201cThe tank is a so-called discontinuous tank, which means that it is completely filled and emptied at periodic intervals.\u201d<\/em> The molten glass takes a form according to a fixed casting plan, either round or rectangular depending on the final product. The new tank in Mainz is also designed for mirror substrates with a diameter of up to 4.25 meters. The two ZERODUR\u00ae mirror substrates for the secondary and tertiary mirrors of the Extremely Large Telescope, for which SCHOTT received the order from the European Southern Observatory (ESO) in mid-January, will be cast from this tank. (See also Press Release No. 007\/2017 from Jan. 18, 2017).<\/p>\n<p>What happens after casting? In order to produce glass-ceramics with the required properties, the so-called raw glass must be subjected to a temperature process in both cooling and ceramizing furnaces. At first, the temperature is slowly increased to such an extent that crystal nucleation begins. After a determined holding time creates the desired number of crystal nuclei, the temperature is further increased to the range of crystal growth. After setting the desired crystallite sizes, blocks are cooled again in a defined manner. The correct ratio of the temperature-increasing glass phase, about 30 percent, and the shrinking crystal phase of about 70 percent with the correct number and size of the crystallites, ensure the combination\u2019s extremely low thermal expansion.<\/p>\n<p>The ZERODUR\u00ae glass-ceramic developed by SCHOTT has been the standard material for mirror substrates in astronomical telescopes for almost 50 years, providing extremely high-resolution images from space due to its \u201cpractically\u201d zero expansion property. In addition to astronomy, the extraordinary material is also a material of choice in other technical applications where extremely low thermal expansion and precision are critical, for example in IC\/LCD lithography, aviation and measurement technology. In Mainz, around 100 employees are engaged in the production and sale of ZERODUR\u00ae glass-ceramic.<\/p>\n<p>For more information visit:\u00a0<a href=\"http:\/\/www.schott.com\">http:\/\/www.schott.com<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>With a state-of-the-art melting tank for ZERODUR\u00ae glass-ceramic production, SCHOTT is now building up\u00a0its production capacities in Mainz to ensure customers reliable delivery At SCHOTT, another glass melting tank was put into [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":24905,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[682],"tags":[691,663,748,783],"class_list":["post-24903","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-process-industry","tag-glass","tag-industry-4-0","tag-process","tag-processindustry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - 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