Enhancing the Densification of Nanocrystalline TiO2by Reduction in Spark Plasma Sintering

Autor:	Jae Sul An, Hyun Soo Han, Hyun Suk Jung, Jun Hong Noh, Chin Moo Cho, Kug Sun Hong, In Sun Cho
Rok vydání:	2010
Předmět:	Work (thermodynamics) Materials science Rutile Tio2 nanoparticles Materials Chemistry Ceramics and Composites Spark plasma sintering Current (fluid) Composite material Joule heating Nanocrystalline material
Zdroj:	Journal of the American Ceramic Society. 93:993-997
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1551-2916.2009.03529.x
Popis:	Fully densified TiO2 was obtained from spark plasma sintering (SPS) nanocrystalline rutile powder at a temperature of 720°C. The TiO2 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 TiO2 nanoparticle compact. Therefore, simple plastic deformation by applied pressure could not lead to the abrupt densification of TiO2 during the SPS. In this work, the abrupt densification of nanocrystalline TiO2 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 Ti4+ to Ti3+.
Databáze:	OpenAIRE
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