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Effects of prior annealing on the spark plasma sintering of nanostructured Y2O3 powders

Attia, Mohammed A. A. and Orrù, Roberto and Delogu, Francesco and Montinaro, Selena and Garroni, Sebastiano and Ewais, Emad Mohamed M. and Cao, Giacomo (2015) Effects of prior annealing on the spark plasma sintering of nanostructured Y2O3 powders. Journal of the American Ceramic Society, Vol. 98 (5), p. 1453-1459. eISSN 1551-2916. Article.

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DOI: 10.1111/jace.13515

Abstract

The effects produced by annealing Y2O3 nanopowders on their spark plasma sintering (SPS) behavior are systematically investigated in this work. It is found that the annealed powders display higher sinterability with respect to the as-received ones. Indeed, the maximum densification level reached from pristine powders is about 97.5%, whereas density decreases when further increasing either the sintering temperature or the dwell time. In contrast, the density of SPS products obtained from pretreated powder monotonically increases with temperature and processing time, thus leading to fully dense materials in 30 min at 1050°C and 60 MPa. Correspondingly, it is found that the annealing treatment markedly inhibits grain coarsening during SPS. Thus, dense translucent samples with grain size below 100 nm can be attained from annealed powders. On the other hand, white-opaque specimens with significantly coarser microstructures (up to 1-μm-sized grains) are obtained when pristine powders are directly processed under the same sintering conditions. Furthermore, it is observed that the annealing treatment of SPS samples in air allows for graphite contamination removal, whereas no improvement in term of light transmittance is produced.

Item Type:Article
ID Code:10899
Status:Published
Refereed:Yes
Uncontrolled Keywords:Annealing, electric sparks, nanopowders, Spark Plasma Sintering (SPS)
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Chimica e Farmacia
Publisher:Blackwell / Wiley
eISSN:1551-2916
Deposited On:05 Jun 2015 17:51

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