Abstract
Hydrothermally synthesized nano-size CeO 2 powders, chemically precipitated CeO 2 powders and commercial micron-size CeO 2 powders were investigated by DTA TGA and TEM. The sintering behavior of these powders was studied by continuous monitoring of the shrinkage kinetics. The microstructural features of the sintered specimens were observed by SEM. The sinterability of the CeO 2 powder compact increased with decrease in particle size. During the high temperature sintering process a redox reaction occurred, i.e. CeO 2 was reduced to Ce 2O 3, and oxygen gas was released. The redox reaction influenced the sintering behavior of CeO 2, resulting in a decrease in density and microcracking for the hydrothermally synthesized nano-size CeO 2 powder compacts, and sagged points in the sintering curves for the chemically precipitated and commercial micron-size CeO 2 powder compacts. It was found that the redox reaction of ceria produced additional pores during the sintering process and thus a much higher temperature was needed to achieve a high density.
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