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Isotropic Amorphous Optical Materials
Published in Daniel Malacara-Hernández, Brian J. Thompson, Advanced Optical Instruments and Techniques, 2017
Luis Efrain Regalado, Daniel Malacara-Hernández
Glass ceramic materials contain both crystalline and glass phases. They are produced as lithia-alumina glasses where a microcrystalline structure is produced with a special thermal procedure. As opposed to ceramic materials, glass ceramics are nonporous. In general, they are not transparent, although sometimes they could be, depending on the size of the crystals, which is about 0.05 μm. Frequently, they are turbid with an amber color. The Pyroceram technology developed by Corning led to the production of a glass ceramic with almost zero thermal expansion coefficient, which is manufactured by several companies, such as CER-VIT (produced by Owens-Illinois), Zerodur (Schott), and Cryston-Zero (Hoya).
Failure and Design
Published in Zainul Huda, Metallurgy for Physicists and Engineers, 2020
A tensile stress of 52 MPa is applied normal to the major axis of a central flaw in a relatively large plate of glass ceramic (Pyroceram). The Young’s modulus and the specific surface energy for Pyroceram are 69 GPa and 0.3 Jm-2, respectively. Calculate the maximum length of the crack that is allowable without causing failure.
The thermal contact resistance of a steel-ceramic interface with oxide intermediates
Published in Cogent Engineering, 2020
Jussi Silvonen, Erkki Levänen, Mikko Uusitalo
A common glass ceramic, Pyroceram 9606 (Corning Inc.) (denoted as PC) round plate (25.4x1 mm) was utilized as the ceramic counterpart. This is a commonly-used reference material consisting mainly of silica-based ceramic with some refractory oxides of aluminum, magnesium and titanium.(Salmon & Tye, 2010) Its thermal conductivity at room temperature is 3.8 W/mK. PC has long been known as a good reference material for thermal diffusivity measurements. It was used in this study because of its homogeneous microstructure, smooth surface and well-researched thermal properties. (Assael, Antoniadis, Kakosimos, & Metaxa, 2008) The heat transfer properties of PC are in the same order as those of low cement castables, which are commonly used in refractories.