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Advances in Materials Science and Engineering
Volume 2014, Article ID 730616, 6 pages
Research Article

Characterization and Alumina Leachability of 12CaO·7Al2O3 with Different Holding Times

1School of Material Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China
2Hebei Key Laboratory of Material Near-Net Forming Technology, Hebei University of Science and Technology, Shijiazhuang 050018, China

Received 23 May 2014; Accepted 26 June 2014; Published 20 July 2014

Academic Editor: Peter Majewski

Copyright © 2014 Hui-lan Sun et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The effect of synthesis time on phase compositions, lattice constant, average grain size, preferred orientation, and surface morphology of 12CaO·7Al2O3 synthesized at 1500°C was analyzed by XRD and SEM. The results indicate that the main phase of samples synthesized is 12CaO·7Al2O3 when holding time is over 30 min. The lattice constant increases and the preferred orientation decreases as synthesis time prolongs. The average grain size of samples is about 59 nm calculated by Scherrer formula, and it does not change with synthesis time. The synthesis time affects the micromorphology of samples greatly. There are more and bigger holes in samples synthesized for long time. The aspects mentioned above cause the alumina leaching ratio of 12CaO·7Al2O3 to increase with the prolonging of synthesis time, but the rate of increase drops.