Getters for vacuum insulated glazing

Abstract The vacuum problem in sealed off chambers of VIGs type has been solved. The solution is based on two innovations. The first one is the usage of activationless getters in a form powders or granules of the composition Ca 0.35 Li 0.45 Mg 0.20 instead of barium. The second one – the changed sequence of assembling the vacuum window at which the getter is introduced into the window under vacuum but after the thermal outgassing and edge sealing of the VIG. A mathematical model of the sorption process for getter powders or granules, which follow the parabolic sorption law, has been built. The model analysis leads to an easy method of calculating the lifetime of the vacuum window, when the thermal-insulating properties are maintained by the getters of the class of reactants. Also a criterion of usefulness of technical solutions as applied to VIGs is provided.