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Combinatorial processing of mixed-metal oxide nanopowders along the ZrO2-Al2O3 tie line using liquid-feed flame spray pyrolysis (LF-FSP)
M. Kim, R.M. Laine
Nanopowders, mixed-metal oxides, combinatorial processing, ZTA
We report here the synthesis of (ZrO2)1-x(Al2O3)x nanooxide powders with molar ratios that span the ZrO2-Al2O3 composition range. Liquid-feed flame spray pyrolysis (LF-FSP) of mixtures of N(CH2CH2O)3Al (alumatrane) and Zr(CH3CH2COO)2(OH)2 precursors dissolved in ethanol, were aerosolized with O2, combusted at temperatures of 1500-2000°C and rapidly quenched thereafter to provide (ZrO2)1-x(Al2O3)x nanopowders of selected compositions. All powders exhibit average particle sizes (APSs) < 20 nm and corresponding surface areas of ≈ 50 m2/g when produced at rates of 100-300 g/h. The as-processed powders were characterized in terms of phase, size, specific surface area, composition, and morphology by BET, XRD, XRF, SEM, TEM, FT-IR, and TGA-DTA. The presence of δ alumina and tetragonal zirconia is observed over most of the compositions studied. Furthermore, this phase segregation leads to the formation of core-shell materials. Evidence is presented suggesting the incorporation of Zr2+/3+ ions above the published solubility limit of ZrO2 in δ-alumina.
J. Ceramic Processing Research
2007
8
129-36
article