A study on particle morphology and sintering behavior of yttria nano powder according to PVA mixing ratio in polymer solution synthesis route
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A porous and single-phase yttria powder was synthesized using PVA polymer solution method and a dense sintered yttria bodywas fabricated without adding a sintering aid. The aggregation of nanoparticles in the synthetic powder and the effect of nanopores on sintering behavior were investigated under variation of the PVA mixing ratio. The yttria nano-powder showedexcellent sintering behavior, but the micropores in the grain of sintered body, which are caused by the influence of the nanopores in the synthetic powder, resulted in intragranular fracture behavior with lower sintered density. As a result of sinteringthe yttria powder synthesized at a mixing ratio of PVA 4:1 at 1650 oC for 2 h, a dense yttria sintered body having a relativedensity of about 98.7% was obtained. Unlike other specimens with different PVA mixing ratios, it showed intergranularfracture behavior with no pore on the fracture surface.
Abstract
A porous and single-phase yttria powder was synthesized using PVA polymer solution method and a dense sintered yttria bodywas fabricated without adding a sintering aid. The aggregation of nanoparticles in the synthetic powder and the effect of nanopores on sintering behavior were investigated under variation of the PVA mixing ratio. The yttria nano-powder showedexcellent sintering behavior, but the micropores in the grain of sintered body, which are caused by the influence of the nanopores in the synthetic powder, resulted in intragranular fracture behavior with lower sintered density. As a result of sinteringthe yttria powder synthesized at a mixing ratio of PVA 4:1 at 1650 oC for 2 h, a dense yttria sintered body having a relativedensity of about 98.7% was obtained. Unlike other specimens with different PVA mixing ratios, it showed intergranularfracture behavior with no pore on the fracture surface.
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