With its new core composition, this glass enables improved damage resistance and toughness by helping to prevent the deep chips and scratches that. This new edition examines the various types of glass ceramic materials, the methods of their development, and their countless applications. Zerodur has both an amorphous vitreous component and a crystalline component. Zerodur a zero expansion glassceramic for demanding. Metal mirrors and singlephase materials do not exhibit such catastrophic damage under similar exposure conditions. Glass ceramic materials share many properties with both glass and more traditional crystalline ceramics. With expanded sections on biomaterials and highly bioactive products i. Design considerations and manufac turing limitations of insert precision glass molding ipgm alan symmons, bryan auz lightpath technologies, inc. Investigating different methods of bonding glass substrates jaime b.
Optical glass 1500s microscopes huygens revolutionized biology. 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. The glass is cooled down and is then reheated in a second step. Assembly is then performed in such a way that the joining liquid forms an interface between each component.
This new extended edition describes the fundamental principles, the manufacturing process, and applications of low thermal expansion glass ceramics. Composition and production homogeneity and reproducibility. The zerodur glassceramic chemical durability has been studied by leaching. To convert them from a vitreous glass material into a crystalline glass ceramic material they must be heat treated or devitrified. Zerodur is a glassceramic material exhibiting a very low coefficient of thermal expansion. Zerodur zero expansion glass ceramic from schott has been the. Structural investigation alexandre doret cnrs, cemhti upr3079, universite dorleans, f45071 orleans.
Pdf atomic force microscopy characterization of zerodur. Zerodur glass ceramic from schott is an inorganic nonporous lithium aluminum siliconoxide material made by the process of controlled volume crystallization. In most cases nucleation agents are added to the base composition of the glassceramic. Design considerations and manufac turing limitations of. The main markets are secondary and tertiary mirrors for astronomical telescopes, mirrors and. 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. Schott supremax 33 is a rolled borosilicate glass utilizing the unique schott rolled sheet glass process.
A method for fabricating composite lightweighted glass ceramics, suitable for use as, e. Heritage of zerodur glass ceramic for space applications. Zerodur glassceramic from schott is an inorganic nonporous lithium aluminum siliconoxide material made by the process of controlled volume crystallization. The material is therefore used as a mirror substrate for astronomical telescopes. These changes are probably related to the nature of the twophase glass ceramic composition of the zerodur material. 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. Optical properties of zerodur date november 2007 page 112 tie 43. The nuclear magnetic resonance spectroscopy analysis has allowed highlighting the network changes. Zerodur is a glass ceramic with an extremely low thermal expansion for demanding applications in which geometrical shape and distance. Zerodur has good optical transmission in the visible light range transmission 80 % from 460 nm to 2500 nm. Structure and composition the distinguishing property of zerodur, its ultralow cte, is the result of its glassceramic composite structure. Crackfree micromachining of glass ceramic using visible. Slocum precision engineering research group massachusetts institute of technology cambridge, massachusetts, u.
Composition and structure of glass and glass ceramics, electrochemistry of glasses. Strength aspects for the design of zerodur glass ceramics. 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.
In zerodur, crystals about 50nm in diameter are suspended in the amorphous material. This means that both amorphous and crystalline phases are present in the material. Zerodur is an inorganic, nonporous lithium aluminum silicon oxide glass ceramic characterized by evenlydistributed nanocrystals within a residual glass phase. Atomic force microscopy characterization of zerodur mirror substrates for the extreme ultraviolet telescopes aboard nasas solar dynamics observatory. 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. Introduction email protected is a glassceramic having practically zero thermal expansion at room temperature. 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. First, a glass is formed by a glassmanufacturing process. Optical glass schott north america schott north america. Influence of alteration solutions on the chemical durability. 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. Technical glasses glass manufacturers glass processing. 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. Thermal expansion of borosilicate glass, zerodur, zerodur m.
A detailed description of schott optical glass properties is available in the optical glass collection datasheets that can be found in the downloads area. Low thermal expansion glass ceramics dieter krause. Glass manufacturers glass processing schott north america. It provides no warranties, either expressed or implied, and assumes no responsibility for the accuracy or completeness of the data contained herein. Advances and processes in precision glass polishing. This is a fine polishing technique which has a really low mrr. The material properties depend on the ratio between the crystalline and the amorphous phase and the material composition. Eads astrium on the strength properties of zerodur. By fitting a three parameter weibull distribution to the data it could be shown that for homogenously ground surfaces minimum breakage stresses exist lying. The distance that each glass type lies away from this normal line is called x,y. Zerodur optical flats ceramic schott glass monochromatic.
Deep etched and released microstructures in zerodur in a. The lisa technology package is presently being developed, integrated and qualified b. Our optical glass goes through a stringent quality inspection before delivery. 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. Jul 08, 2014 production of glass ceramic materials. Sodalime glass is one of the most common and least expensive forms of glass. Zerodur is a yellowish glass ceramic developed by schott glass.
What properties of glassceramics hold promise for the future. Zerodur has unmatched low thermal expansion properties and is very durable. B 270 superwite optical properties university of chicago. First, a glass is formed by a glass manufacturing process. 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. Schott offers zerodur as small finished components, ultralight weight mirror substrates, but also as mirror substrates for large segmented and monolithic astronomical telescopes. Pdf forty years of zerodur r mirror substrates for astronomy. Ule ultralow expansion glass request for quotation. Pdf influence of alteration solutions on the chemical. Very large mirrors and other systems may be composed of many components made of zerodur. Development of defectfree glass central to a variety of scientific revolutions. Improvements in properties, understanding and production. Structure and composition the distinguishing property of zerodur, its ultralow cte, is the result of its glass ceramic composite structure. A typical composition is 6075% silica, 1218% soda, 512% lime.
This material is produced under tightly controlled conditions and offers outstanding thermal, mechanical and chemical properties. 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. Introduction zerodur is a glass ceramic material exhibiting a very low coefficient of thermal expansion. In this heat treatment the glass partly crystallizes. There is a broad range of applications for lightweighted components made from zerodur r glass ceramic. Pdf zerodur r glass ceramics strength data for the design. Schott research and development summarized their physical and technical glass properties 1.
Schott series on glass and glass ceramics science, technology, and applications. Thermal properties the most important and significant properties of the glass ceramic zerodur are the extremely small coefficient of linear thermal expansion. Zerodur is an inorganic, nonporous lithium aluminum silicon oxide glass ceramic characterized by evenly distributed nanocrystals within a residual glass phase. Extraordinary properties zerodur is a zero expansion glass ceramic with extraordinary properties for demanding applications in which geometrical shape. Written in an easytouse format, the book includes an explanation of the new generation of glass ceramics. Zerodur robert russell opti521 fall 2011 introduction zerodur is. Component pieces are polished then joined at low temperature using a silicatecontaining joining liquid. Investigation of alzerodur interface by raman and secondary. Manufacturing of lightweighted zerodur r components at. This report summarizes the chemical, physical and optical properties of zerodur and discusses the applications for. The correlation between the pressure derivatives of zerodur and other silicarich glasses is discussed. Thermal expansion of borosilicate glass, zerodur, zerodur m, and unceramized zerodur at low temperatures j. Like for other glassy materials the strength of glass ceramics is dominated by its surface condition.
Adhesivefree bonding of zerodur glass to silicon pdf. Tie43 optical properties of zerodur refractiveindex. This range of zerodur optical flats are singlesided optical flats and dual faced optical flats. So, assembling these components is an important engineering task. Different components made of zerodur can be jointed together by diffusion welding. In case of an increasing temperature, the amorphous phase has thermal expansion with a positive value, which is compensated by a negative coefficient. In some applications mirrors and support structures from the zero expansion glass ceramic material zerodur r have to endure mechanical loads, e. Corning 9658 glass shows a linear unit volume variation with pressure. Zerodur is a glass ceramic consisting of amorphous and crystalline phases. Quality assurance schott is both iso 9001 and 14001 certified and can be your trusted partner.
Subsurface damage in precision ground ule and zerodur. Currently, a number of projects are studying the possibility. 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. The glass composition is identical to schott borofloat 33. The zeroexpansion glass ceramic zerodur from schott is widely used for groundbased astronomical mirrors and in industrial applications.
Us20020192422a1 glass ceramic composite of mirror blank. Glass windows replacing dark wooden shuttersoiled paper in europe, 1400s and the development of superior mirrors heightened awareness of cleanliness and hygiene. 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. The fracture toughness was determined using indentation techniques and was found to be 0.
The material is therefore used as a mirror substrate for astronomical. In most cases nucleation agents are added to the base composition of the glass ceramic. For many years, different methods for bonding glass. Ultralow expansion glass ceramics thermal properties mechanical properties. Although the composition varies slightly from one batch to another, a typical example is shown in table 1 4,5. 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.
Oct 15, 2018 zerodur is a glass ceramic consisting of amorphous and crystalline phases. Glasses display both the properties of supercooled liquids and crystalline materials but. This manufacturing technique offers a wide range of glass thicknesses with appealing surface quality. Zerodur is a zero expansion glass ceramic with extraordinary properties for demanding applications in which geometrical shape and distance changes. Agi works closely with our suppliers to ensure the fastest delivery of filter glasses that we dont have on. This allows you to take advantage of our vast glass knowledge, or, if you prefer, to have us melt your glass composition. Its superior composition allows a deeper layer of chemical strengthening than is. This paper points out that it is also well suited for satellite applications, especially with respect to the space radiation environment. Design strength of optical glass and zerodur date october 2004 page 510 n f t v a f p r n 1. Practical aspects and implications of interfaces in glassceramics. Hence glass modifier oxides are also known as conditional glass formers. This produces a material with an extremely low coefficient of thermal expansion and of the highest homogeneity which makes it. It contains a crystallized phase and a rest glass phase, which together create the unique properties of this exceptional. Design strength of optical glass and zerodur date october 2004 page 210 2.
Zerodur optical flats are also available in lambda10 and lambda20 types from stock. Zerodur catalogue schott glas pdf catalogs technical. Click here for a list of filter glasses and industrial glasses in stock at advanced glass industries. This material safety data sheet is offered solely for your information, consideration and investigation. Before polishing a surface on teflon, it must be polished using a pitch so that it will remove all the. 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. Zerodur extremely low expansion glass ceramic schott ag. Advances and processes in precision glass polishing technique1. Introduction email protected is a glass ceramic having practically zero thermal expansion at room temperature.
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