Article ID Journal Published Year Pages File Type
5440435 Journal of the European Ceramic Society 2017 9 Pages PDF
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
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