Densification and grain growth during pressureless sintering of TiO2 nanoceramics

✍ Scribed by Jiangong Li; Yinping Ye; Liya Shen; Jianmin Chen; Huidi Zhou

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 217 KB
• Volume: 390
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2004.08.025

✦ Synopsis

Anatase titania nanopowders with mean particle sizes of 7, 15, 26 and 38 nm synthesized by sol-gel method were used to sinter bulk TiO 2 nanoceramics. The relative densities and average grain sizes of the TiO 2 nanoceramics were studied as a function of the compaction pressure on green sheet, sintering temperature, and mean particle size of the starting TiO 2 nanopowders. The relative density of the TiO 2 nanoceramics increases rapidly and average grain size increases slowly with increasing sintering temperature below 800 • C. Sintering at higher temperatures above 800 • C enhances the densification of the TiO 2 nanoceramics and leads to a increase of the grain size. Bulk TiO 2 nanoceramics with an average grain size of less than 60 nm and relative density over 95% was obtained by a phase-transformation-assisted pressureless sintering at a relatively low temperature (800 • C).