Getters for vacuum insulated glazing

• Published in: Vacuum 2018-09, Vol.155, p.300-306
• Main Authors: Chuntonov, K., Ivanov, A.O., Verbitsky, B., Setina, J.
• Format: Article
• Language: English
• Subjects: Ca-Li-Mg alloys; Getter reactants; Parabolic sorption law; Vacuum insulated glasses; VIGs life time
• ISSN: 0042-207X; 1879-2715
• DOI: 10.1016/j.vacuum.2018.06.012

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 Ca0.35Li0.45Mg0.20 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. •Heating of glass together with a getter is a drawback of current VIGs technologies.•The problem solution is to introduce of the getter after and not before heating.•Activationless getters Ca-Li-Mg is the best substitution for toxic Ba.•The sorption model as a tool for selecting the optimal VIGs parameters.