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Excerpt from Variations Caused in Heating Curves of Glass by Heat Treatment
The exothermic eflect occurs when a chil led glass is heated because this glass while being heated through the lower part of the temperature range of this effect is, from a physicochemical standpoint, in a series of very unstable conditions which correspond more nearly to the equilibria which are attainable at temper atu1 es above the point where the curve maximum occurs than they do to those equilibrium condi tions which the glass 1s Oapp1oaching so long as it is in the tempera ture rang e belowo the point of this curve maximum.
In theg consideration or these unstable conditions it is desirable to select some characteristic of a glass in a given condition that will differentiate that condition more or less definitely from all other conditions in which the glass may exist at the same actual tempera ture. A theoretical temperature corresponding to that equilibrium condition which most closely resembles the given condition 1s suitable for this purpose, since the glass assumes these unstable conditions because the chilling treatment produced an under cooling, the excep tional magnitude of which may be visualized in this way; that is, this equilibrium temperature in falling during the chilling treatment (see curves A' and B', fig. 1 (b) lagged farther and farther behind the acutal temperature of the glass as the cooling progressed and became practically stationary much sooner (relatively speaking) than the latter and at a point which was well above the usual annealing range where equilib1ium conditions are normally approximated as a result of ordinai y annealing treatments.
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Variations Caused in Heating Curves of Glass by Heat Treatment
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Paperback. Zustand: New. Print on Demand. This book examines how heat treatment alters the properties of glass. The author focuses on heating curves to reveal the changes appearing when glass is heated after different heat treatments. They assert that these variations in the curves are indicative of the character of the heat treatments, as well as changes in other characteristics like elasticity and density. The progression of these properties toward stability is not linear and can be expedited or reversed by altering the temperature, duration, and order of heat treatments. Though it is impossible to reach an equilibrium of properties at commonly used temperatures, tempering at lower temperatures for longer durations increases homogeneity. These insights are critical for producing glass with optimal properties for instruments requiring high precision and uniformity. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item. Bestandsnummer des Verkäufers 9781527867130_0
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Zustand: New. KlappentextrnrnExcerpt from Variations Caused in Heating Curves of Glass by Heat TreatmentThe exothermic eflect occurs when a chil led glass is heated because this glass while being heated through the lower part of the temperature range . Bestandsnummer des Verkäufers 2149095636
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