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VARIATIONS IN GLASS CAUSED BY HEAT TREATMENT 1
Author(s) -
Tool A. Q.,
Eichlin C. G.
Publication year - 1925
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1925.tb16325.x
Subject(s) - endothermic process , exothermic reaction , thermodynamics , connection (principal bundle) , silica glass , specific heat , sample (material) , simple (philosophy) , mineralogy , materials science , chemistry , mathematics , physics , composite material , philosophy , geometry , adsorption , epistemology
The exothermic and endothermic effects detectable from the forms of the heating curves of a glass vary in magnitude depending on the previous heat treatment. With many of the common glasses, these variations bear a relatively simple relation to any changes in this treatment, but with others the relationship is not so easily established. Some glasses which are exceptional in this respect have a rather high silica content. It is shown in this paper that the previous heat treatment is always the chief determining factor in these variations. It should be possible therefore to obtain considerable information relative to the treatment a glass sample has received by simply studying such curves. It should also be possible to study in the same way, the relative effectiveness of the various heat treatments which may appear desirable. It is further shown that the density is affected by the heat treatment and in the discussion reasons are given for believing that many of the other properties of glass may be varied by the same means. In this connection some speculative views as to the nature of glass are included as aids toward explaining effects already observed and also for suggesting others which should be sought.