Paper Title:
Reaction Sintering Kinetics of Mullite Ceramics Prepared from High Aluminum Fly Ash
  Abstract

This research presented the kinetics of mullite formation in fly ash-bauxite reactants couples. Experiment on isothermal conversion of fly ash-bauxite at 1100°C, 1300°C, 1500°C has been carried out. XRD was used to quantitatively measure the content of mullite specimens sintered at different temperatures and times. The kinetics curve of conversion ratio versus time has been drawn. The results obtained showed that the full transformation of fly ash-bauxite to mullite takes place between 1300 °C and 1500 °C. The activation energy of secondary mullite formation is deduced to be 151 kJ/mol in the range of 1100-1500°C. The growth morphology parameter, n, is about 1.14 and 0.45 at 1100°C and 1500°C, respectively, indicating that bulk nucleation is dominant in mullite crystallization followed by three-dimensional growth of mullite crystal controlled by diffusion, but at 1500 °C diffusion process dominates mullite formation process.

  Info
Periodical
Materials Science Forum (Volumes 654-656)
Main Theme
Edited by
Jian-Feng Nie and Allan Morton
Pages
2010-2013
DOI
10.4028/www.scientific.net/MSF.654-656.2010
Citation
J. H. Li, H. W. Ma, L. X. Tong, X. Q. Jiang, "Reaction Sintering Kinetics of Mullite Ceramics Prepared from High Aluminum Fly Ash", Materials Science Forum, Vols. 654-656, pp. 2010-2013, 2010
Online since
June 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Zhao Hui Huang, Xun Hai Tang, Yan Gai Liu, Ming Hao Fang
Abstract:A new environment friendly method to synthesize sialon composites using fly ash with high content of Al2O3 by carbon-thermal...
933
Authors: Feng Li, Xiang Dong Liu, Yuan He Guo
Abstract:In this paper, with sodium carbonate as an auxiliary agent in the fly ash, the mixtures were sintered at 880°C for 90 min, then dissolved by...
1170
Authors: Bogdan Iliev Bogdanov, Yancho Hristov, Dimitar Petrov Georgiev, Irena Markovska
Chapter 07: Applied Chemistry
Abstract:A lightweight inorganic polymer is obtained using ash from thermal power plants, metakaolinite and lightweight aggregate. This inorganic...
580
Authors: Yong Qiang Sun, Yong Li, Shuo Cao, Hao Bo Zhang, Chang He Gao, Ji Li Zhang
Chapter 3: Glasses and Refractories
Abstract:High temperature creep properties of Al2O3-SiO2 ore (65% Al2O3 by mass percentage,...
343