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Effect of TiO2 doping on microstructural properties of Al2O3-based single crystal ceramics
Serkan Aball 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.1
Powders of Al2O3-TiO2 containing, 48 and 40% TiO2 by weight were formed into single crystals with a Verneuil furnace at 2088 K. Raman spectroscopy was used to determine the phase composition of the samples solidified from the Al2O3-TiO2powder. The resulting β-Al2TiO5-Al6Ti2O13, β-Al2TiO5-Al2O3 single crystals were probed with micro hardness assays, scratch test analyses, atomic force microscopy (AFM), scanning electron microscopy (SEM), thermal expansion and four-point bending tests. It was observed that the alumina-tialite single crystal retained a composition of Al2O3-TiO2 containing 60%Al2O3 by weight and displayed optimum properties.