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. † (
In this work, the mechanical properties of SiC samples with (5 wt%) alumina and (5
wt%) rare earth oxides (REO) additions were investigated at room and high temperatures. The
possibility of using REO instead of pure yttria could bring cost reductions to obtain sintered SiC
ceramics. The powders were mixed, milled, sieved and hot-pressed at 1800°C in argon atmosphere.
Hardness and fracture toughness were evaluated at room temperature. The compressive creep
behavior was carried out under stress range from 150 to 300MPa and temperatures of 1300, 1350
and 1400°C. After creep tests, the surface analysis of the samples by XRD and SEM showed
indications of oxidation reactions, cavity and cracking. The possible creep mechanisms activated in
this system were diffusion, grain boundary sliding and cavitation
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