The present work investigates the influence of TiO2 additions on sintering behavior of Al2O3, ZrO2 (12 mol% CeO2) and Al2O3-ZrO2 (12 mol% CeO2) ceramics for dental applications. Alumina-Titania, Zirconia-Titania and Titania-Alumina-Zirconia powder mixtures were uniaxially pressed and pressureless sintered at 1400 °C for 2 h. The phase composition and distribution, densification and microstructures of ceramic composites were evaluated by using X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy-dispersive spectrometer (EDS). According to the results, an appreciable increase of alumina and zirconia density by adding only 0.27 wt% TiO2 was observed. A continuous increase of density of alumina with titania was observed, while an opposite trend was found for zirconia. Furthermore, as indicated by XRD analysis, nano-TiO2 addition has greatly influenced the phase composition and distribution, stimulating the formation of mixed phases in binary and ternary ceramics systems. SEM proved that TiO2 content played major roles in controlling the porosity rate and geometry and the grain growth in different ceramic composites.

Effect of TiO2 addition on microstructure of zirconia/alumina sintered ceramics

Khaskhoussi, Amani;Calabrese, Luigi;Proverbio, Edoardo
2017-01-01

Abstract

The present work investigates the influence of TiO2 additions on sintering behavior of Al2O3, ZrO2 (12 mol% CeO2) and Al2O3-ZrO2 (12 mol% CeO2) ceramics for dental applications. Alumina-Titania, Zirconia-Titania and Titania-Alumina-Zirconia powder mixtures were uniaxially pressed and pressureless sintered at 1400 °C for 2 h. The phase composition and distribution, densification and microstructures of ceramic composites were evaluated by using X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy-dispersive spectrometer (EDS). According to the results, an appreciable increase of alumina and zirconia density by adding only 0.27 wt% TiO2 was observed. A continuous increase of density of alumina with titania was observed, while an opposite trend was found for zirconia. Furthermore, as indicated by XRD analysis, nano-TiO2 addition has greatly influenced the phase composition and distribution, stimulating the formation of mixed phases in binary and ternary ceramics systems. SEM proved that TiO2 content played major roles in controlling the porosity rate and geometry and the grain growth in different ceramic composites.
2017
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11570/3119930
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