Effect of TiO2 on the properties of ultralow-cement alumina-spinel castables
- 76 Downloads
An ultralow-cement castable based on the Al2O3-MgO spinel system is synthesized by the interaction of fused alumina (70%) and sintered periclase (30%) using a calcium aluminate cement (75% Al2O3) and a co-deposited gel Al(OH)3 and Mg(OH)2 as the castable bond. The addition of TiO2 and its effect on the apparent density, volume shrinkage, open porosity, and true density of sintered specimens (at 1400–1600 °C) is studied. Results of a microstructure analysis using x-ray diffractometry and scanning electron microscopy are reported. The additive TiO2 is shown to exert a positive effect on the formation of spinel and physicomechanical properties of the system.
KeywordsSinter Temperature Apparent Density Open Porosity Glassy Phase True Density
Unable to display preview. Download preview PDF.
- 1.A. H. De Azza, P. Pena, M. A. Rodrigue, et al., J. Eu. Ceram. Soc., No. 23, 737–744 (2003).Google Scholar
- 2.P. Korgula, D. R. Wilson, and W. E. Lea, “Microstructural analysis of corroded alumina-spinel castable refractories,” J. Eu. Ceram. Soc., No. 17, 77–84 (1997).Google Scholar
- 3.R. Sarkar and G. Banerjee, “Effect of addition of TiO2 on reaction-sintered MgO-Al2O3-spinels,” J. Eu. Ceram. Soc., No. 20, 2133–2141 (2000).Google Scholar
- 4.I. Ganesha, S. Bhattacharjee, B. P. Sahay, et al., “An efficient MgAl2O4 spinel additive for improved slag erosion and penetration resistance of high Al2O3 and MgO-C refractories,” Ceram. Int., No. 28, 245–253 (2002).Google Scholar
- 5.Y. C. Ko, “Role of spinel composition in the slag resistance of Al2O3-spinel and Al2O3-MgO-castables,” Ceram. Int., No. 28, 805–810 (2002).Google Scholar
- 6.S. K. Chena, M. Y. Cheng, S. J. Lin, and Y. C. Ko, “Thermal characteristics of Al2O3-MgO and Al2O3-spinel castables for steel ladles,” Ceram. Int., No. 28, 805–810 (2002).Google Scholar
- 7.S. Miatra and S. Bhattacharaya, “Role of MgO and Fe2O3 on aluminum titanate ceramics,” Industrial Ceram. (in press).Google Scholar
- 8.B. D. Cullity, Elements of X-Ray Diffraction, Addison-Wesley, New York (1959), pp. 388–392.Google Scholar