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Nanostructured Spark Plasma Sintered Ce‐TZP Ceramics
Author(s) -
Cruz Sylvia A.,
Poyato Rosalía,
Cumbrera Francisco L.,
Odriozola Jose A.
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04978.x
Subject(s) - materials science , spark plasma sintering , nanocrystalline material , ceramic , tetragonal crystal system , sintering , chemical engineering , grain size , graphite , monoclinic crystal system , grain growth , cubic zirconia , coating , particle size , nanoparticle , phase (matter) , mineralogy , metallurgy , composite material , nanotechnology , crystallography , crystal structure , chemistry , organic chemistry , engineering
In this work, spark plasma sintering ( SPS ) of 10 mol% CeO 2 ‐doped ZrO 2 nanocrystalline powders, obtained by a two‐step synthesis procedure, allows the preparation of fully densified nanostructured ceramics. The CeO 2 –ZrO 2 powders with particle size below 100 nm are obtained after CeO 2 deposition on hydrothermally synthesized ZrO 2 particles by the impregnation method. Tetragonal CeO 2 –ZrO 2 ceramics are obtained when sintering at 1200°C without holding time. A graded material containing tetragonal, monoclinic, and pyrochlore phases are obtained when sintering at 1200°C and for 5 min holding time. This is explained in terms of the gradual reduction of Ce 4+ to Ce 3+ species by carbon in the graphite environment during SPS . With the successful combination of the stabilizer coating technique and SPS , we achieve not only the stabilization of the tetragonal phase in the ceramics, but also good control of the grain size, by producing nanostructured ceramics with 40–70 nm grain sizes.