Glass forming region and bonding mechanism of low‐melting V₂O₅–TeO₂–Bi₂O₃ glass applied in vacuum glazing sealing

Abstract

As a new kind of energy-saving glass, vacuum glazing has excellent thermal and sound insulation properties and is widely used in building, household appliances and solar photovoltaic. The edge sealing material, along with sealing method, is key to the fabrication of vacuum glazing. Low transition temperature (T g ) and good fluidity at sealing temperature (T s ) make low-melting glass of V 2 O 5 -TeO 2 -Bi 2 O 3 (VTB) system perfect to be the edge sealing material for vacuum glazing. The glass forming region of VTB ternary system was mapped for the first time in this work. Low-melting VTB glass of 40V 2 O 5 -50TeO 2 -5Bi 2 O 3 -3ZnO-2Na 2 O (wt%) was optimized to be the sealing material. Glass powder of this composition could be used to seal the edges of vacuum glazing at an extremely low temperature of 360°C. With the assistance of anodic-bonding method, the bonding strength of vacuum glazing was dramatically enhanced. Vacuum glazing fabricated under the optimized process parameters of 420°C, 600 V, and 60 min possesses a highest bonding strength of 4.31 MPa. Furthermore, anodic-bonding mechanism of low-melting VTB glass applied in vacuum glazing sealing has been thoroughly researched. K E Y W O R D S anodic-bonding, glass, glass forming region, glass transition, lead-free glass, low-melting glass, V 2 O 5 -TeO 2 -Bi 2 O 3 (VTB), vacuum glazing F I G U R E 2 The edge sealing processes of vacuum glazing, (A) printing of multilayer coating, (B) drying the sample to make organic solvent evaporated, (C) sealing the sample in an anodic-bonding furnace [Color figure can be viewed at wileyonlinelibrary.com] How to cite this article: Li H, Yu H, Chen P, et al. Glass forming region and bonding mechanism of low-melting V 2 O 5 -TeO 2 -Bi 2 O 3 glass applied in vacuum glazing sealing.