In the ternary SrO-Al2O3-SiO2 system the pseudobinary join composition of 50 wt % SrO·SiO2-50 wt % SrO·Al2O3·2SiO2 (SS-SA2S) showed a glass melting temperature of approximately 1500 °C and a crystallization peak temperature of approximately 1100 °C. The (SS-SA2S) glass-ceramic pellets prepared by cold pressing and pressureless sintering, showed very low porosity. The (SS-SA2S) glass-ceramics containing B2O3 and those containing B2O3 and TiO2 revealed crystallization peak temperatures of approximately 1000 °C and unexpectedly high porosity. By applying Kissinger analyses to the DTA data the activation energy values for crystallization of the three glass-ceramics were determined to range from 196 to 255 kJ/tool. The Ozawa analyses on the DTA data gave the Avrami parameter values at 3.69 to 3.95. The X-ray diffraction (XRD) patterns from the three glass-ceramics revealed formation of the equilibrium crystalline phases of SrO·SiO2 and SrO·Al2O3-2SiO2 (monocelsian).
ASJC Scopus subject areas
- Materials Science(all)