A Check of Applicability of the Relaxation Model of Annealing to Calculation of Stresses in Low-Temperature Annealing of a Glass-Molybdenum Seal

摘要

The previously developed relaxation model for annealing of glass selas with other materials has been applied widely.It remains unclear whether there are a specific low temperature and very long-term isothermal treatments at which this simple model ceases to work correctly and requires complication or even revision.Withthe aim to determine the minimum fictive temperature at which therelaxation model of annealing of anealing of glass swal withan elastic material is still applicable,the stresses in the sandwich S52-2 glass-molybdenum seals are measured at differentstabilization temperatures.The experimental temperature-time dependences of the stresses are compared with those calculated using the relaxation modelof seal annealing.The use of this relatively simpel model leads to a quite satisfactory agreement (even if not identicalat all the temperatures) in the range from the glass transition temperature to 380degC for stabilization durations as long as 81days.This treatment duration makes it possible to reach a structural temperaure of 434degC,which is considerably lower than the structural temperature (525degC) obtained upon simple cooling of glass at a rate of 3K/min.