Effect of different calcination techniques on the morphologyand powder flowability characteristics of Rare-earth Zirconates (Re2Zr2O7; Re = La, Gd, Nd, Y) synthesized by solid-state high-energy milling process
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Rare-earth zirconate (Re2Zr2O7, Re = La, Gd, Nd, Y) ceramic materials was synthesized by solid-state reaction methodthrough high-energy ball-milling process (HEBM) and subsequently followed by two different calcination techniques. Theimpacts of the two different calcination techniques on the phase structure, morphology, powder flowability (i.e. particle sizeand distribution, specific surface area, pore size and pore volume) were studied. The effectiveness of the calcination techniquesof the resulting Re2Zr2O7 powders were investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy(FTIR), and Scanning electron microscopy (SEM) techniques. The outcomes demonstrated that both calcination techniquescould produce Re2Zr2O7 powders with an excellent pyrochlore structure. The calcination temperature was reduced by theMicrowave Calcination (MWC) technique when compared with the Conventional Calcination (CVC) technique. The rareearthzirconate powders exhibited different particle size distribution. The resulting particle median diameter was about 2.5-45 μm for CVC and 1.36-2.27 μm for MWC. The powder flowability of Re2Zr2O7 powders was strongly dependent on theparticle size and distribution. Thus MWC technique for the preparation of Re2Zr2O7 powders is the best choice of powderprocessing to achieve desired properties.
Abstract
Rare-earth zirconate (Re2Zr2O7, Re = La, Gd, Nd, Y) ceramic materials was synthesized by solid-state reaction methodthrough high-energy ball-milling process (HEBM) and subsequently followed by two different calcination techniques. Theimpacts of the two different calcination techniques on the phase structure, morphology, powder flowability (i.e. particle sizeand distribution, specific surface area, pore size and pore volume) were studied. The effectiveness of the calcination techniquesof the resulting Re2Zr2O7 powders were investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy(FTIR), and Scanning electron microscopy (SEM) techniques. The outcomes demonstrated that both calcination techniquescould produce Re2Zr2O7 powders with an excellent pyrochlore structure. The calcination temperature was reduced by theMicrowave Calcination (MWC) technique when compared with the Conventional Calcination (CVC) technique. The rareearthzirconate powders exhibited different particle size distribution. The resulting particle median diameter was about 2.5-45 μm for CVC and 1.36-2.27 μm for MWC. The powder flowability of Re2Zr2O7 powders was strongly dependent on theparticle size and distribution. Thus MWC technique for the preparation of Re2Zr2O7 powders is the best choice of powderprocessing to achieve desired properties.
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