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Enhancing the Densification of Nanocrystalline TiO 2 by Reduction in Spark Plasma Sintering
Author(s) -
Noh Jun Hong,
Jung Hyun Suk,
Cho InSun,
An JaeSul,
Cho Chin Moo,
Han Hyun Soo,
Hong Kug Sun
Publication year - 2010
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.1551-2916.2009.03529.x
Subject(s) - spark plasma sintering , nanocrystalline material , materials science , sintering , composite material , severe plastic deformation , metallurgy , joule heating , deformation (meteorology) , rutile , nanotechnology , microstructure , chemical engineering , engineering
Fully densified TiO 2 was obtained from spark plasma sintering (SPS) nanocrystalline rutile powder at a temperature of 720°C. The TiO 2 was densified under an applied pressure of 40 MPa at 720°C. However, the applied pressure was not great enough to cause plastic deformation within the TiO 2 nanoparticle compact. Therefore, simple plastic deformation by applied pressure could not lead to the abrupt densification of TiO 2 during the SPS. In this work, the abrupt densification of nanocrystalline TiO 2 was examined at a low temperature in terms of the Joule heat caused by the flow of current through the compact due to the reduction of Ti 4+ to Ti 3+ .