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Effect of 1 wt% LiF additive on the densification of nanocrystalline Y 2O 3 ceramics by spark plasma sintering

Effect of 1 wt% LiF additive on the densification of nanocrystalline Y 2O 3 ceramics by spark plasma sintering,10.1016/j.jeurceramsoc.2010.12.032,Jour

Effect of 1 wt% LiF additive on the densification of nanocrystalline Y 2O 3 ceramics by spark plasma sintering   (Citations: 1)
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Densification of nanocrystalline cubic yttria (nc-Y2O3) powder, with 18nm crystal size and 1wt% LiF as a sintering additive was investigated. Specimens were fabricated by spark plasma sintering at 100MPa, within the temperature range of 700–1500°C. Sintering at 700°C for 5 and 20min resulted in 95% and 99.7% dense specimens, with an average grain size of 84 and 130nm, respectively. nc-Y2O3 without additive was only 65% dense at 700°C for 5min. The presence of LiF at low sintering temperatures facilitated rapid densification by particle sliding and jamming release. Sintering at high temperatures resulted in segregation of LiF to the grain boundaries and its entrapment as globular phase within the fast growing Y2O3 grains. The sintering enhancement advantage of LiF was lost at high SPS temperatures.
Journal: Journal of The European Ceramic Society - J EUR CERAM SOC , vol. 31, no. 6, pp. 1057-1066, 2011
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