Enhancing the Densification of Nanocrystalline TiO2 by Reduction in Spark Plasma Sintering
Abstract: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+.
Document Type: Research Article
Affiliations: 1: Department of Materials Science & Engineering, Seoul National University, Seoul 151-744, Korea 2: School of Advanced Materials Engineering, Kookmin University, Seongbuk-gu, Seoul 136-702, Korea 3: Research Institute of Advanced Materials, Seoul National University, Seoul 151-744, Korea
Publication date: April 1, 2010