Grain size control by pressure application regime during spark plasma sintering of Nd-YAG nanopowders
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Recently, spark plasma sintering (SPS) has successfully been used for fabrication of fully dense and transparent oxides [1, 2, 3, 4] and nanocrystalline ceramics [5, 6, 7, 8]. It was both experimentally  and theoretically [10, 11] shown that application of high pressures in SPS may enhance the densification rate at lower temperatures, and hence preserve the nano gain size character of the dense ceramic. Nevertheless, grain growth was found to be an inevitable process in SPS, especially at the final stages of sintering/densification. The driving force for grain growth in pure materials is the grain boundary (gb) curvature . More homogeneous particle size and shape are expected to decrease this driving force. Therefore, control of the nanostructure green compact prior to and during the SPS process via the processing parameters may be beneficial for controlling the final grain size. In the present work, we examined the effect of the pressure application regime on densification and...
KeywordsSpark Plasma Sinter Sintered Specimen Nanocrystalline Powder Dense Compact Dense Specimen
The support of the Israel Ministry of Defense and the Fund for Promotion of Research at the Technion and the Swedish Research Council through grant 621-2005-6299 are gratefully acknowledged.
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