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Korean Journal of Metals and Materials > Volume 54(8); 2016 > Article
Korean Journal of Metals and Materials 2016;54(8): 621-625. doi: https://doi.org/10.3365/KJMM.2016.54.8.621
Study of Water Resistance of Fe2O3 Doped P2O5–ZnO–Bi2O3 Sealing Glass System
Moon Kyung Hwang, Il Gu Kim, Bong Ki Ryu
Department of Materials Science and Engineering, Pusan National University, Pusan 46241, Republic of Korea
Correspondence  Bong Ki Ryu ,Tel: +82-51-510-2384, Email: bkryu@pusan.ac.kr
Received: 16 September 2015;  Accepted: 5 April 2016.  Published online: 5 August 2016.
ABSTRACT
In order to strengthen the structure of the glass and ultimately improve its water resistance, P2O5–ZnO–Bi2O3 was doped with Fe2O3, which generated Fe ions in the phosphate-based glass. These ions constitute (P2O7)−4 groups within the glass network. Structural analysis using Fourier transfer infrared spectroscopy indicated that P-O-P and Bi-O-P bonds decreased and Fe-O-P bonds increased, as a function of the Fe2O3 level. The thermal property analysis found that the softening point (Ts) and glass transition point (Tg) increased approximately as much as 60 and 105 °C, respectively, and the coefficient of thermal expansion decreased approximately by 25 × 10-7 K-1. The contact angle was measured to quantify the wetting property. The contact angle increased from 42.6° to 64.1° with increasing levels of Fe2O3 at 850 °C. As an indication of water resistance, the weight loss of the 10 mol-% Fe2O3-doped glass was 0.00514 g cm-2, while that of the undoped glass was 0.00710 g cm-2.
Keywords: glasses, sintering, corrosion, thermal analysis, water resistance
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