Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5440435 | Journal of the European Ceramic Society | 2017 | 9 Pages |
Abstract
The sintering kinetics of ceramic nanoparticles is essential for preparing dense nanocrystalline ceramics with fine grains, but the sintering kinetics of disperse ultrafine α-Al2O3 nanoparticles has not been systematically explored so far. In this paper, the sintering kinetics of disperse ultrafine equiaxed α-Al2O3 nanoparticles with a mean particle size of 4.5 nm and a narrow size distribution of 2-8 nm without any agglomeration was studied systematically. Finally, α-Al2O3 nanocrystalline ceramic with a mean grain size of 36 nm and a relative density of 99.7% was sintered in air by two-step sintering (heated to 1100 °C without hold and then cooled down to 950 °C with a 40 h hold). The sintering temperature is the lowest for pressureless sintering of α-Al2O3 and almost fully dense α-Al2O3 nanocrystalline ceramic obtained also has the finest grain so far.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Wenbin Cao, Xuan Mao, Yuan Yuan, Lu Li, Libin Zhao, Jiangong Li,