Ule ultralow expansion glass request for quotation. Corning 9658 glass shows a linear unit volume variation with pressure. Zerodur optical flats are also available in lambda10 and lambda20 types from stock. Pdf atomic force microscopy characterization of zerodur. Schott research and development summarized their physical and technical glass properties 1. Zerodur is a glassceramic material exhibiting a very low coefficient of thermal expansion. Currently, a number of projects are studying the possibility. Investigating different methods of bonding glass substrates. This allows you to take advantage of our vast glass knowledge, or, if you prefer, to have us melt your glass composition. In case of an increasing temperature, the amorphous phase has thermal expansion with a positive value, which is compensated by a negative coefficient. Zerodur glassceramic from schott is an inorganic nonporous lithium aluminum siliconoxide material made by the process of controlled volume crystallization. Agi works closely with our suppliers to ensure the fastest delivery of filter glasses that we dont have on.
Glass ceramic components are formed using the same processes that are applicable to glass components. Investigation of alzerodur interface by raman and secondary. Adhesivefree bonding of zerodur glass to silicon pdf. This new extended edition describes the fundamental principles, the manufacturing process, and applications of low thermal expansion glass ceramics.
Eads astrium on the strength properties of zerodur. Advances and processes in precision glass polishing technique1. Us20020192422a1 glass ceramic composite of mirror blank. Optical glass 1500s microscopes huygens revolutionized biology.
Thermal expansion of borosilicate glass, zerodur, zerodur. In most cases nucleation agents are added to the base composition of the glass ceramic. Zerodur has good optical transmission in the visible light range transmission 80 % from 460 nm to 2500 nm. In this heat treatment the glass partly crystallizes. Pdf forty years of zerodur r mirror substrates for astronomy. Investigating different methods of bonding glass substrates jaime b. Zerodur catalogue schott glas pdf catalogs technical.
Structure and composition the distinguishing property of zerodur, its ultralow cte, is the result of its glass ceramic composite structure. Manufacturing of lightweighted zerodur r components at. Influence of alteration solutions on the chemical durability. Heritage of zerodur glass ceramic for space applications. This produces a material with an extremely low coefficient of thermal expansion and of the highest homogeneity which makes it. Glass properties on globalspec, glassonweb, matweb, glass global a general overview about glass art, history, science, literature, social studies, and technology is available at the corning museum of glass view as pdf, 1.
First, a glass is formed by a glassmanufacturing process. This paper points out that it is also well suited for satellite applications, especially with respect to the space radiation environment. The composition, structure, and stability of polycrystalline materials having a low thermal expansion are described, and it is shown how low thermal expansion glass ceramics can be manufactured. With its new core composition, this glass enables improved damage resistance and toughness by helping to prevent the deep chips and scratches that. Zerodur is a yellowish glass ceramic developed by schott glass. The main markets are secondary and tertiary mirrors for astronomical telescopes, mirrors and. Glasses display both the properties of supercooled liquids and crystalline materials but. The material properties depend on the ratio between the crystalline and the amorphous phase and the material composition. Inclusions have no effect on the function of zerodur as a substrate material for surfaces of the highest quality in so far as they lie completely within the volume. Zerodur is an inorganic, nonporous lithium aluminum silicon oxide glass ceramic characterized by evenly distributed nanocrystals within a residual glass phase. The zerodur glassceramic chemical durability has been studied by leaching. In zerodur, crystals about 50nm in diameter are suspended in the amorphous material.
A typical composition is 6075% silica, 1218% soda, 512% lime. Crackfree micromachining of glass ceramic using visible. Schott series on glass and glass ceramics science, technology, and applications. Composition and production homogeneity and reproducibility. Inclusions in zerodur are distinguished by the designations standard and special and also draw on the inclusion classes 3 to 0 which apply to optical glass. Zerodur zero expansion glass ceramic from schott has been the. Pdf zerodur r glass ceramics strength data for the design. Before polishing a surface on teflon, it must be polished using a pitch so that it will remove all the. In some applications mirrors and support structures from the zero expansion glass ceramic material zerodur r have to endure mechanical loads, e. This range of zerodur optical flats are singlesided optical flats and dual faced optical flats. In most cases nucleation agents are added to the base composition of the glassceramic. The lisa technology package is presently being developed, integrated and qualified b.
Practical aspects and implications of interfaces in glassceramics. Technical glasses glass manufacturers glass processing. The material is therefore used as a mirror substrate for astronomical. B 270 superwite b 270 superwite is a clear high transmission crown glass modified sodalime glass available in form of sheets, optical rods, profiled rods, strips and chain moulded rod. It contains a crystallized phase and a rest glass phase, which together create the unique properties of this exceptional. The revised third edition of glass ceramic technology offers a comprehensive and updated guide to the various types of glass ceramic materials, the methods of development, and the myriad applications for glass ceramics. Pdf influence of alteration solutions on the chemical. The nuclear magnetic resonance spectroscopy analysis has allowed highlighting the network changes. Click here for a list of filter glasses and industrial glasses in stock at advanced glass industries. Fracture toughness and crack growth properties of zerodur abstract the fracture toughness and crack growth parameters of zerodurl, a low expansion glass ceramic material, were determined. Glass manufacturers glass processing schott north america. Zerodur is a zero expansion glass ceramic with extraordinary properties for demanding applications in which geometrical shape and distance changes. Deep etched and released microstructures in zerodur in a.
The fracture toughness was determined using indentation techniques and was found to be 0. To convert them from a vitreous glass material into a crystalline glass ceramic material they must be heat treated or devitrified. Zerodur has unmatched low thermal expansion properties and is very durable. Before polishing a surface on teflon, it must be polished using a pitch so that it will remove all the imperfections and all the grinding marks. First, a glass is formed by a glass manufacturing process. Introduction email protected is a glassceramic having practically zero thermal expansion at room temperature. Component pieces are polished then joined at low temperature using a silicatecontaining joining liquid. This kind of twophase materials is constituted by nanocrystals embedded in a glass matrix and the respective composition and volume fractions of crystalline and amorphous phase determine the properties of the glass ceramic. Glass ceramic materials share many properties with both glass and more traditional crystalline ceramics. Advances and processes in precision glass polishing. Borosilicate glass, once invented by the glass pioneer otto schott and today supplied by several glass companies worldwide, is the industrys gold standard to package pharmaceutical drugs. Tie43 optical properties of zerodur refractiveindex. Slocum precision engineering research group massachusetts institute of technology cambridge, massachusetts, u.
Introduction zerodur is a glass ceramic material exhibiting a very low coefficient of thermal expansion. Assembly is then performed in such a way that the joining liquid forms an interface between each component. Normal glass types tend to lie along a straight line between the two points which would be plotted for the two glass types 511605 nsl7 and 620363 pbm2. There is a broad range of applications for lightweighted components made from zerodur r glass ceramic. Strength aspects for the design of zerodur glass ceramics. Zerodur is a glass ceramic with an extremely low thermal expansion for demanding applications in which geometrical shape and distance. Zerodur is a zero expansion glass ceramic with extraordinary properties for demanding applications in which geometrical shape and distance changes must be kept as small as possible during changes in temperature. Schott supremax 33 is a rolled borosilicate glass utilizing the unique schott rolled sheet glass process. Metal mirrors and singlephase materials do not exhibit such catastrophic damage under similar exposure conditions. Jul 08, 2014 production of glass ceramic materials. This new edition examines the various types of glass ceramic materials, the methods of their development, and their countless applications. Zerodur is a glass ceramic consisting of amorphous and crystalline phases.
The zeroexpansion glass ceramic zerodur from schott is widely used for groundbased astronomical mirrors and in industrial applications. Design considerations and manufac turing limitations of. Thermal expansion of borosilicate glass, zerodur, zerodur m. Improvements in properties, understanding and production.
B 270 superwite optical properties university of chicago. The material is therefore used as a mirror substrate for astronomical telescopes. This material safety data sheet is offered solely for your information, consideration and investigation. Glass windows replacing dark wooden shuttersoiled paper in europe, 1400s and the development of superior mirrors heightened awareness of cleanliness and hygiene. Low thermal expansion glass ceramics dieter krause. Optical glass schott north america schott north america. Zerodur robert russell opti521 fall 2011 introduction zerodur is. Thermal expansion of borosilicate glass, zerodur, zerodur m, and unceramized zerodur at low temperatures j. These changes are probably related to the nature of the twophase glass ceramic composition of the zerodur material. Sodalime glass is one of the most common and least expensive forms of glass. This means that both amorphous and crystalline phases are present in the material.
Our optical glass goes through a stringent quality inspection before delivery. Zerodur a zero expansion glassceramic for demanding. Design considerations and manufac turing limitations of insert precision glass molding ipgm alan symmons, bryan auz lightpath technologies, inc. Design strength of optical glass and zerodur date october 2004 page 510 n f t v a f p r n 1. Composition and structure of glass and glass ceramics, electrochemistry of glasses. By fitting a three parameter weibull distribution to the data it could be shown that for homogenously ground surfaces minimum breakage stresses exist lying. Corning gorilla glass 3 with native damage resistance is an alkalialuminosilicate thin sheet glass that is better able to survive the realworld events that most commonly cause glass failure. Clearceram z is a glasscer amic with an ultralow thermal expansion coefficient which was developed by ohara based on our knowledge of high homogeneity melting and precise crystallization. Types of technical glasses in the following, technical glasses are understood to be spe cial glasses manufactured in the form of tubes, rods, hollow vessels and a variety of special shapes, as well as flat glass and glass powder for use mainly in chemistry, laboratory technology, pharmaceuticals, optoelectronics, and house. Thermal properties the most important and significant properties of the glass ceramic zerodur are the extremely small coefficient of linear thermal expansion.
Tie33 design strength of optical glass and zerodur us. Zerodur glass ceramic made by schott is an inorganic, nonporous material made by a process of controlled volume crystallization. What properties of glassceramics hold promise for the future. So, assembling these components is an important engineering task. Although the composition varies slightly from one batch to another, a typical example is shown in table 1 4,5. Schott offers zerodur as small finished components, ultralight weight mirror substrates, but also as mirror substrates for large segmented and monolithic astronomical telescopes. For many years, different methods for bonding glass. Oct 15, 2018 zerodur is a glass ceramic consisting of amorphous and crystalline phases. This is a fine polishing technique which has a really low mrr. Extraordinary properties zerodur is a zero expansion glass ceramic with extraordinary properties for demanding applications in which geometrical shape. A method for fabricating composite lightweighted glass ceramics, suitable for use as, e. Structure and composition the distinguishing property of zerodur, its ultralow cte, is the result of its glassceramic composite structure. This material is produced under tightly controlled conditions and offers outstanding thermal, mechanical and chemical properties.
Quality assurance schott is both iso 9001 and 14001 certified and can be your trusted partner. Atomic force microscopy characterization of zerodur mirror substrates for the extreme ultraviolet telescopes aboard nasas solar dynamics observatory. Structural investigation alexandre doret cnrs, cemhti upr3079, universite dorleans, f45071 orleans. In this way we can provide you with glass samples suitable for characterization of optical, physical, and laser properties, as well as for fabrication of small optics and devices. A detailed description of schott optical glass properties is available in the optical glass collection datasheets that can be found in the downloads area. Written in an easytouse format, the book includes an explanation of the new generation of glass ceramics. This manufacturing technique offers a wide range of glass thicknesses with appealing surface quality. The distance that each glass type lies away from this normal line is called x,y.
Zerodur has both an amorphous vitreous component and a crystalline component. Ultralow expansion glass ceramics thermal properties mechanical properties. Hence glass modifier oxides are also known as conditional glass formers. Zerodur optical flats ceramic schott glass monochromatic. Zerodur glass ceramic from schott is an inorganic nonporous lithium aluminum siliconoxide material made by the process of controlled volume crystallization. Introduction email protected is a glass ceramic having practically zero thermal expansion at room temperature. Very large mirrors and other systems may be composed of many components made of zerodur. Subsurface damage in precision ground ule and zerodur. The correlation between the pressure derivatives of zerodur and other silicarich glasses is discussed. Development of defectfree glass central to a variety of scientific revolutions.
The glass is cooled down and is then reheated in a second step. It provides no warranties, either expressed or implied, and assumes no responsibility for the accuracy or completeness of the data contained herein. Optical properties of zerodur date november 2007 page 112 tie 43. This report summarizes the chemical, physical and optical properties of zerodur and discusses the applications for. With expanded sections on biomaterials and highly bioactive products i.
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