Densification behaviour and microstructure evolution of -Al2O3 nanoceramics during pressureless sintering
Authors: Li, D.; Zhu, H.-L.; Chen, S.-O.; Shao, W.-Q.; Ge, X.-H.; Zhang, Y.-C.; Zhang, S.-S.
Source: Materials Technology: Advanced Performance Materials, Volume 23, Number 3, September 2008 , pp. 145-147(3)
Publisher: Maney Publishing
Abstract:A high purity -Al2O3 sample with an average particle size of 30 nm was sintered in air at temperature 960–1650°C at a heating rate of 5 K min–1 using a dilatometer. The instantaneous density determined by shrinkage was compared with that measured by the Archimedes method at room temperature. The microstructure evolution during sintering was observed by scanning electron microscope. The shrinkage shows two stages. The first stage, ∼8% linear shrinkage, occurs between 950 and 1150°C. The second starts at 1150°C and extends to higher temperatures. There are two shrinkage rate peaks respectively at 1110 and 1550°C. The two stages in the shrinkage curve indicate that the phase transformation has occurred. The α-Al2O3 ceramics were prepared with grain size of 1˙32 µm, relative density of 92˙3%, open porosity of 5˙81% and closed porosity of 1˙89% at 1650°C.
Document Type: Research Article
Publication date: 2008-09-01
- Materials Science and Technology is Journal of the Month in November. This means free online access to all of the last 3 years of content, including the most recently published 2013 articles! Find out more here
- Editorial Board
- Information for Authors
- Subscribe to this Title
- Terms & Conditions
- ingentaconnect is not responsible for the content or availability of external websites