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J. Korean Ceram. Soc. > Volume 59(2); 2022 > Article
Journal of the Korean Ceramic Society 2022;59(2): 208-216.
doi: https://doi.org/10.1007/s43207-021-00182-w
Effects of ZnO and cordierite contents on the wetting properties of a Bi2O3–ZnO–B2O3 glass composite as a low-melting sealing glass
Byeong Hoon Bae1, Kang Hyeck Hu1, Ji Na Song1, Min Jung Oh1, Si Hong Ryu1, Hyun-Do Jung2,3, Chang-Bun Yoon1
1Department of Advanced Materials Engineering, Korea Polytechnic University, Siheung-si, Gyeonggi-do 15073, Republic of Korea
2Department of Biotechnology , The Catholic University of Korea , 43 Jibong-ro, Wonmi-gu , Bucheon-Si , Gyeonggi-do   14662 , Republic of Korea
3Department of Biomedical-Chemical Engineering , The Catholic University of Korea , 43 Jibong-ro, Wonmi-gu , Bucheon-Si , Gyeonggi-do   14662 , Republic of Korea
Correspondence  Hyun-Do Jung ,Email: hdjung@catholic.ac.kr
Chang-Bun Yoon ,Email: cbyoon@kpu.ac.kr
Received: August 2, 2021; Revised: December 9, 2021   Accepted: December 15, 2021.  Published online: March 31, 2022.
The wetting properties of Bi2O3–ZnO–B2O3 glass composite materials with different ZnO and cordierite contents were investigated upon melting them and thermally treating them at 1300 °C and 430 °C, respectively. The density of a 48%Bi2O3–24%ZnO–22% B2O3 glass composite was 7.30 g/cm3, which is 99.3% of its theoretical density; its glass softening temperature was 413.2 °C. The addition of cordierite improved the adhesion of the glass by acting as a filler, thus lowering its coefficient of thermal expansion. Specifically, by adding 0–15% cordierite, the coefficient of thermal expansion of the Bi2O3 –ZnO–B2O3 glass was reduced from 10.6 × 10–6 to 7.5 × 10–6 /K. X-ray diffraction and transmission electron microscopy studies confirmed that the glass was not crystallized, but rather a composite. This study demonstrates that the Bi2O3 –ZnO–B2O3 glass composite developed herein is an environment-friendly lead-free material that can be sintered at 430 °C without losing its tempered glass function; therefore, this material shows promise for applications in architecture, electronic devices, and home appliances.
Key words: Bi2O3–ZnO–B2O3 glass  · Cordierite  · Thermal properties  · Wettability  · Sealing material
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