Premium
THE LAW OF ANNEALING OF GLASS: QUANTITATIVE TREATMENT AND MOLECULAR INTERPRETATION *
Author(s) -
Taylor Nelson W.
Publication year - 1938
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.1151-2916.1938.tb15750.x
Subject(s) - annealing (glass) , thermodynamics , birefringence , chemistry , silicate glass , silicate , chemical physics , materials science , mineralogy , physics , optics , organic chemistry
A bstract The reduction of strain birefringence with time in Pyrex‐brand chemical resistant glass has been shown to follow the equation. The molecular nature of stress and strain has been examined, and it has been shown that the Maxwell law is followed when the strain‐bearing molecular species (principally the dissociated units) relax independently, without interaction; the Adams‐Williamson law is followed when these same species relax by virtue of interaction according to the well‐known law for a second order or bimolecular reaction, —dX/dt = k 2 X 2 . The temperature dependence of each of these two processes is discussed and an activation energy of 94,000 calories is calculated for the bimolecular interaction process. The theory as outlined appears to be a necessary and sufficient description of the annealing process in silicate glasses or similar materials.