| Abstract: |
This research presented a new method of glass surface pre-metallization+low temperature soldering in order to obtain metallurgical bonding of glass to steel. Prior to the soldering process, tempered glass were deposited with Al2O3/Cu coatings multilayer by means of Arc Plasma Spraying (APS). Then the coated glass were soldered to steel at low temperature using Sn-based filler metal. The influence of sandblasting pretreatment of glass substrate and heat input in spraying process on microstructure and properties of ceramic coatings were investigated, as well as the mechanical properties of soldered joint. The results showed that the premetallized coating treatment effectively improved the weldability of glass with steel. The ceramic coatings obtained a maximum strength of 20.5MPa. In certain extents, with the increase of sandblasting particle size, the bonding strength of Al2O3 coating increased. In addition, with the increase of spraying heat input, the bonding strength of Al2O3 coating decreased gradually. The joints all fractured at location of interface between Al2O3 coatings and glass substrate. A maximum joint strength of 16.9MPa was achieved when the soldering temperature was 270, and holding time was 4min. However, for tempered glass substrate with high hardness and high brittleness, lots of defects, i.e. crack, chip, groove and peel-off etc. in glass surface produced by sandblasting pretreatment process were considered as the main reason for decrease of bonding strength.
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