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- W2034452971 abstract "Abstract The objective of this research was to investigate the effect of ultrafine synthesis methods on the consolidation behavior of nano-crystalline ZrO2. Cost effective, scaleable processes were utilized so that the work would be relevant to industrial issues. Both 4 mol.% Y2O3 and 8 mol.% Y2O3 stabilized nano-crystalline ZrO2 were synthesized using the Rapid Thermal Decomposition of Precursors in Solution (RTDS) process (a continuous hydrothermal process) and a modified Glycine-Nitrate (GNP) synthesis method (a combustion synthesis technique). The RTDS method involves a brief (<2 sec) exposure of an aqueous solution containing dissolved metal oxide precursors to hydrothermal conditions amenable to particle nucleation and growth. Typically, powders are prepared from nitrate precursors under acidic (pH <2) conditions. Due to the solubility of Y2O3 below pH3, Y2O3 stabilized ZrO2 was also synthesized under basic conditions (pH >9) by the addition of urea to the precursor stock solution. Both acidic and basic synthesis routes produced crystallite sizes <5 nm. The Glycine-Nitrate process is a combustion synthesis method that is particularly useful for synthesizing ultra-fine, multicomponent oxide powders. For the preparation of stabilized ZrO2, a fuel system consisting of carbohydrazide buffered with urea was used in place of glycine. The exothermic decomposition of zirconyl nitrate and this fuel resulted in fine ZrO2 particles (= 25-50 nm) depending upon redox conditions (carbohydrazide to urea ratio) of the combustion event. The influence of synthesis parameters and powder characteristics (morphology, phase, crystallite/particle size, agglomerate size, surface area) on compaction and sintering behavior was investigated." @default.
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- W2034452971 date "1996-11-01" @default.
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- W2034452971 title "Consolidation of Nano-Crystalline ZrO2" @default.
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- W2034452971 doi "https://doi.org/10.1080/10426919608947547" @default.
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