Effect of SrO content on microstructure of Bi2O3-B2O3-ZnO-BaO-SrO low-melting glass frit and joining performance of sodalime glass substrates

•Various studies of low-melting glass powders have shown that the addition of SrO promotes the formation of more [BO4] structural units.•Ultra-fine transition zone (width 10 nm) and small Bi24B2O39 crystallites are observed in the area where the sealing glass is connected to the soda-lime glass subs...

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Published in:Journal of alloys and compounds 2021-08, Vol.872, p.159707, Article 159707
Main Authors: Zhang, Luobin, Sun, Qin, Wang, Jintao, Zhang, Zheng, Zhang, Weiwei, Wang, Jianqiang, Chen, Hongtao, Li, Mingyu
Format: Article
Language:English
Subjects:
Barium oxides
Bi24B2O39
Bismuth borate glasses
Bismuth oxides
Bismuth trioxide
Bonding
Boron oxides
Crystallites
Deionization
Frit
Glass substrates
Lead free
Low-melting glass frit
Mechanical properties
Melting
Microstructure
Muffle furnaces
Room temperature
Screen printing
Shear properties
Shear strength
Silicon dioxide
Soda-lime glass
Soda-lime glass joint
Strontium oxides
X ray photoelectron spectroscopy
Zinc oxide
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Summary:•Various studies of low-melting glass powders have shown that the addition of SrO promotes the formation of more [BO4] structural units.•Ultra-fine transition zone (width 10 nm) and small Bi24B2O39 crystallites are observed in the area where the sealing glass is connected to the soda-lime glass substrate.•ystallitesin the transition zone is discovered. [Display omitted] We studied the feasibility of using Bi-based lead-free glass paste as bonding material on soda-lime glass substrates, without any activation preparation on the bonding surfaces. In order to fabricate Bi2O3-B2O3-ZnO-BaO-SrO system low-melting glass frit, quenching is performed using deionized water after melting using a muffle furnace. Glass paste consisting of glass frit mixed with organic solvent is deposited on the surface of the soda-lime glass substrate by screen printing, and the sealing of the glass substrate is finally achieved at the bonding temperature (500 °C). we discuss the properties of glass powder, the joint microstructure of irregular amorphous glass, the shear properties and the glass frit bonding mechanism based on the characterization results of DSC, XRD, FTIR, Raman, XPS, SEM and TEM. Furthermore, the investigation concentrated on mechanical properties and microstructural characterization of the joined area with two silica substrates. As the SrO content increased from 0 to 3 mol%, Tg increased from 396 °C to 418 °C with increasing SrO content. Accompanied by an increase in SrO content from 1 mol% to 2 mol%, the room-temperature shear strength of the glass specimens increased from 28.5 to 45 MPa. The growth of Bi24B2O39 crystallites precipitated at the interface was studied.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2021.159707