Structural and mechanical characterization of mullite and aluminium titanate reinforced yttria stabilized zirconia ceramic composites
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3 mole % yttria stabilized zirconia (YSZ) ceramic and 20 wt. % mullite (M), and 20 wt. % aluminium titanate (AT) reinforcedYSZ ceramic composites were produced using a conventional ceramic production process. After a combined method of wetball milling and dry pressing, these samples were sintered at 1500 oC and 1600 oC for 1hr and 5hrs, respectively. Physicalproperties, microstructural and phase characterizations of the sintered samples were analyzed using Archimedes method, ascanning electron microscope with energy dispersive spectroscopy and X-ray diffraction technique, respectively. Thereafter,micro Vickers and three-point bending tests were performed. The density, relative density and firing shrinkage of the sinteredsamples increased with addition of M and AT and the increased sintering temperature at each time. However, both porosityand loss of water properties determined were inversely proportional to M and AT addition and sintering temperature and timeincrease. An increase in M and AT content influenced the grain morphology as is presented in the microstructures of thecomposites produced thus bringing about a rise in grain size, as well as homogeneity and density in YSZ samples. Promisingresults were observed with the Vickers and bending strength in the mullite reinforced YSZ samples sintered at 1600 oC for 5hrsdue to mullite addition, which provides excellent mechanical features to the YSZ ceramic composites.
Abstract
3 mole % yttria stabilized zirconia (YSZ) ceramic and 20 wt. % mullite (M), and 20 wt. % aluminium titanate (AT) reinforcedYSZ ceramic composites were produced using a conventional ceramic production process. After a combined method of wetball milling and dry pressing, these samples were sintered at 1500 oC and 1600 oC for 1hr and 5hrs, respectively. Physicalproperties, microstructural and phase characterizations of the sintered samples were analyzed using Archimedes method, ascanning electron microscope with energy dispersive spectroscopy and X-ray diffraction technique, respectively. Thereafter,micro Vickers and three-point bending tests were performed. The density, relative density and firing shrinkage of the sinteredsamples increased with addition of M and AT and the increased sintering temperature at each time. However, both porosityand loss of water properties determined were inversely proportional to M and AT addition and sintering temperature and timeincrease. An increase in M and AT content influenced the grain morphology as is presented in the microstructures of thecomposites produced thus bringing about a rise in grain size, as well as homogeneity and density in YSZ samples. Promisingresults were observed with the Vickers and bending strength in the mullite reinforced YSZ samples sintered at 1600 oC for 5hrsdue to mullite addition, which provides excellent mechanical features to the YSZ ceramic composites.
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