Solder layer and application
To achieve a mechanically sound soldered joint, the glass must be coated all round with a layer of material capable of being soldered. This material must withstand high thermo mechanical loading and must be well wetted on the surface by the liquid metal solder. At the same time, however, no diffusion of the metal solder must be allowed to occur through the coating to the glass surface in order that the adhesive strength of the joint is not compromised. Coatings for the metalization and soldering of glass have been developed at Fraunhofer IWM. A system of multiple layers with a ceramic bonding agent and solder able intermediate and cover layers has proved itself particularly suitable. Thus the metal band can be joined to the glass by means of a metal coating of the glass and soft solder.