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). (Received September 16, 2015; Accepted April 5, 2016)
keyword : glasses, sintering, corrosion, thermal analysis, water resistance
