Elastic-viscoplasticity modeling of the thermo-mechanical behavior of chalcogenide glass for aspheric lens molding

2017-2018 > Academic research: refereed > Publication in refereed journal201808 bcrcAccepted ManuscriptRGCOthersNational Key Basic Research Program of China; National Natural Science Foundation of China; The Hong Kong Polytechnic University; Fok Ying-Tong Education Foundation for Young Teachers in the Higher Education Institutions of ChinaPublishe

Thermal properties of chalcogenide glasses

Thermal analysis techniques provide powerful tools for both the fundamental understanding and practical applications of chalcogenide glasses. Differential scanning calorimetry, thermogravimetric, and thermomechanical analysis all provide insight not only into those properties of chalcogenide glasses which are critical for hot-forming applications, such as precision molding or fiber drawing, but also into the atomic-scale structural units that give rise to this material behavior. Similarly, a clear understanding of the viscosity-temperature relationship in chalcogenides is necessary for glass processing, from melting to fabrication, but also gives deep insight into fundamental structural differences between sulfide, selenide, and telluride glasses. © 2014 Woodhead Publishing Limited. All rights reserved

Glass Shaping

International audienceThe possibility to shape glass easily and in all kind of forms for applications in our everyday life is one of the key factors to its success. The fabrication of a glass article comprises a succession of steps, often starting from a hot glass melt that is shaped during its cooling. The product can then be worked at lower temperatures, to modify its dimensions or its surface finish. In this chapter, the shaping processes at both high and low temperatures are presented. In a first part, the different forming processes (shaping at high temperature) developed by the glass industry are illustrated, and a specific emphasis is given to glass viscosity, a key parameter in these processes. In the second part of the chapter, the shaping processes occurring at low temperatures, such as cutting or grinding, are described. In this section, specific attention is given to the mechanical behavior of the glass during the process as well as to machining parameters. © 2019, Springer Nature Switzerland AG