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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Glass ceramics were studied, formulated in the Na2O CaO. P2O5, Na2O. BaOP2O5, Na2O. Al2O3.P2O5, and Li2O. BaO. P2O5 systems to establish their suitability for sealing to high thermal expansion metals, e.g. aluminum, copper, and 300 series stainless steels. Glass ceramics in Na2O. CaO. P2O5 and Na2O. BaO. P2O5 systems have coefficients of thermal expansion in the range 140 x 10−1 per °C less than or equal to .cap alpha. less than or equal to 225 x 10−7 per °C and fracture toughness values generally greater than those of phosphate glasses; they are suitable for fabricating seals to high thermal expansion metals. Crystal phases include NaPo3, (NaPO3)3, NaBa(PO3)3, and NaCa(PO3)3. Glass ceramics formed in the Na2O. Al2O3.P2O5 systems have coefficients of thermal expansion greater than 240 x 10−7 per °C, but they have extensive microcracking. Due to their low thermal expansion values (.cap alpha. less than or equal to 120 x 10−7 per °C), glass ceramics in the Li2O. BaO. P2O5 system are unsuitable for sealing to high thermal expansion metals.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Glass ceramics were studied, formulated in the Na2O CaO. P2O5, Na2O. BaOP2O5, Na2O. Al2O3.P2O5, and Li2O. BaO. P2O5 systems to establish their suitability for sealing to high thermal expansion metals, e.g. aluminum, copper, and 300 series stainless steels. Glass ceramics in Na2O. CaO. P2O5 and Na2O. BaO. P2O5 systems have coefficients of thermal expansion in the range 140 x 10−1 per °C less than or equal to .cap alpha. less than or equal to 225 x 10−7 per °C and fracture toughness values generally greater than those of phosphate glasses; they are suitable for fabricating seals to high thermal expansion metals. Crystal phases include NaPo3, (NaPO3)3, NaBa(PO3)3, and NaCa(PO3)3. Glass ceramics formed in the Na2O. Al2O3.P2O5 systems have coefficients of thermal expansion greater than 240 x 10−7 per °C, but they have extensive microcracking. Due to their low thermal expansion values (.cap alpha. less than or equal to 120 x 10−7 per °C), glass ceramics in the Li2O. BaO. P2O5 system are unsuitable for sealing to high thermal expansion metals.
Author: Dieter Krause Publisher: Springer Science & Business Media ISBN: 3540282459 Category : Science Languages : en Pages : 260
Book Description
This completely revised edition features new sections on glass-ceramic applications and their performance, CDC-grinding, and laser gyroscopes containing Zerodur®., providing an overview of Schott's activities for scientists, engineers, and managers.
Author: Publisher: ISBN: Category : Languages : en Pages : 17
Book Description
The formation of a crack-free between 300 series stainless steel and a glass-ceramic is difficult owing to the high coefficients of thermal expansion of the stainless steels. Lithia-alumina-silica (LAS) glass-ceramics were successfully developed and sealed to 304L stainless steel. These crack-free seals were fabricated by two techniques: by adjusting the parent glass composition (reducing the Al2O3 content), or by adjusting the sealing/crystallization cycle. All seals were hermetic, with leak rates
Author: Publisher: ISBN: 9783662030851 Category : Ceramic materials Languages : en Pages : 223
Book Description
This book is one of a series reporting on international research and development activities conducted by the Schott group of companies. With the series, Schott aims to provide an overview of its activities for scientists, engineers, and managers from all branches of industry worldwide where glasses and glass ceramics are of interest. Each volume begins with a chapter providing a general idea of the current problems, results, and trends relating to the subjects treated. This volume describes the fundamental principles, the manufacturing process, and applications of low thermal expansion glass ceramics. 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 from appropriately chosen glass compositions. Examples illustrate the formation of this type of glass ceramic by utilizing normal production processes together with controlled crystallization. Thus glass ceramics with thermal coefficients of expansion of less than 0.3 x 10( -6)K( -1) can be obtained. Even for the mass production of high-quality cooktop panels (Ceran (R)), oven windows, and other household appliances a high reproducibility of the properties is achieved. Special glass ceramics (Zerodur (R)) for technological and scientific applications such as high-precision optics or large astronomical mirrors are equally discussed.
Author: M. Salvo Publisher: Elsevier Inc. Chapters ISBN: 0128088885 Category : Technology & Engineering Languages : en Pages : 29
Book Description
Glass-ceramics can be versatile joining materials with tailorable thermal and mechanical properties; they are not affected by oxidation and can be used as pressureless joining materials above their glass softening point. The glassy phase can be minimized by a suitable thermal treatment in order to improve the glass-ceramic creep behaviour. The use of glasses and glass-ceramics as sealants in solid oxide fuel cells and as joining materials for SiC-based materials will be discussed.
Author: Wolfram Holand Publisher: John Wiley & Sons ISBN: 1118265920 Category : Technology & Engineering Languages : en Pages : 456
Book Description
Glass-ceramic materials share many properties with both glass and more traditional crystalline ceramics. This new edition examines the various types of glass-ceramic materials, the methods of their development, and their countless applications. With expanded sections on biomaterials and highly bioactive products (i.e., Bioglass and related glass ceramics), as well as the newest mechanisms for the development of dental ceramics and theories on the development of nano-scaled glass-ceramics, here is a must-have guide for ceramic and materials engineers, managers, and designers in the ceramic and glass industry.
Author: Publisher: ISBN: Category : Languages : en Pages : 13
Book Description
Glass-ceramic sealing materials have been developed with mechanical and chemical properties suitable for a variety of high-temperature applications. We have demonstrated the ability to tailor the thermal expansion coefficient between 8 and 12 x 10−6/°C, and the softening temperature can be adjusted such that the materials have suitable viscosities for a soft, compliant seal at temperatures ranging from 650 to 1000°C. These materials form excellent bonds to a variety of ceramics and metals during heating to the target operation temperature. They have limited reactivity with the fuel cell materials tested and are stable in both air and reducing environments.
Author: James E Shelby Publisher: Royal Society of Chemistry ISBN: 1847551165 Category : Technology & Engineering Languages : en Pages : 308
Book Description
Introduction to Glass Science and Technology presents the fundamental topics in glass science and technology including glass formation, crystallisation and phase separation. A detailed discussion of glass structure models with emphasis on the oxygen balance model is also presented. Additional chapters discuss the most important properties of glasses, including physical, optical, electrical, chemical and mechanical properties, and new to this edition, water in glasses and melts. Glass technology is addressed in chapters dealing with the details of glass raw materials, melting and fining, and commercial glass production methods. This expanded second edition also includes new chapters on the compositions and properties of commercial glasses and thermal analysis of glasses and melts. Exercises are included at the end of the chapters. This introductory text is ideal for undergraduates in materials science, ceramics or inorganic chemistry. It will also be useful to the engineer or scientist seeking basic knowledge of the formation, properties and production of glass.
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Author: Hans Bach
Author: Dieter Krause
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Author: M. Salvo
Author: J. H. Partridge
Author: Wolfram Holand
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Author: James E Shelby