Dissolution and diffusion of TiO2 in the CaO-Al2O3-SiO2 slag
Tóm tắt
The dissolution of TiO2 in the CaO-Al2O3-SiO2 slag under static conditions was studied in the temperature range from 1643 K to 1703 K. After TiO2 dissolved, the microstructure of the interface between TiO2 and the slag was observed by scanning electron microscopy, and the concentration profiles of Ti4+ and other ions across the TiO2/slag interfaces were analyzed by energy-dispersive X-ray spectroscopy. On the basis of these results, the dissolution behavior of TiO2 was evaluated, and the diffusivity of Ti4+ in the bulk slag was estimated. According to the Stokes-Einstein relation, the viscosity calculated by a previously reported model gave a diffusivity of Ti4+ ions greater than that estimated by the concentration profiles of Ti4+ ions. The mechanism of TiO2 dissolution in the CaO-Al2O3-SiO2 slag is discussed in detail.
Tài liệu tham khảo
M. Wang, Y.P. Bao, H. Cui, H.J. Wu, and W.S. Wu, Generation mechanism of Al2O3-TiN inclusion in IF steel, J. Iron Steel Res., 22(2010), No. 7, p. 29.
A.O. Kluken and Ø. Grong, Mechanisms of inclusion formation in Al-Ti-Si-Mn deoxidized steel weld metals, Metall. Trans. A, 20(1989), No. 8, p. 1335.
W.C. Doo, D.Y. Kim, S.C. Kang, and K.W. Yi, The morphology of Al-Ti-O complex oxide inclusions formed in an ultra low-carbon steel melt during the RH process, Met. Mater. Int., 13(2007), No. 3, p. 249.
M.K. Sun, I.H. Jung, and H.G. Lee, Morphology and chemistry of oxide inclusions after Al and Ti complex deoxidation, Met. Mater. Int., 14(2008), No. 6, p. 791.
R.F. Johnston, R.A. Stark, and J. Taylor, Diffusion in liquid slags, Ironmaking Steelmaking, 4(1974), p. 220.
Z. Ping and S. Seetharaman, Dissolution of MgO in CaO-“FeO”-CaF2-SiO2 slags under static conditions, J. Am. Ceram. Soc., 77(1994), No. 4, p. 970.
S.H. Amini, M.P. Brungs, S. Jahanshahi, and O. Ostrovski, Effects of additives and temperature on dissolution rate and diffusivity of lime in Al2O3-CaO-SiO2 based slags, Metall. Mater. Trans. B, 37(2006), p. 773.
J.H. Park, I.H. Jung, and H.G. Lee, Dissolution behavior of Al2O3 and MgO inclusions in the CaO-Al2O3-SiO2 slags: formation of ring-like structure of MgAl2O4 and Ca2SiO4 around MgO inclusions, ISIJ Int., 46(2006), No. 11, p. 1626.
X. Yu, R.J. Pomfret, and K.S. Coley, Dissolution of alumina in mold fluxes, Metall. Mater. Trans. B, 28(1997), No. 2, p. 275.
D.Y. Wang, J. Liu, M.F. Jang, F. Tsukihashi, and H. Matsuura, Dissolution of Al2TiO5 inclusions in CaO-SiO2-Al2O3 slags at 1823 K, Int. J. Miner. Met. Mater., 18(2011), No. 6, p. 646.
G.H. Zhang and K.C. Chou, Modeling the viscosity of aluminosilicate melt, Steel Res. Int., 84(2013), No. 7, p. 631.
G.H. Zhang, K.C. Chou, and K. Mills, Modelling viscosities of CaO-MgO-Al2O3-SiO2 molten slags, ISIJ Int., 52(2012), No. 3, p. 355.
M.D. Dolan and R.F. Johnston, Multicomponent diffusion in molten slags, Metall. Mater. Trans. B, 35(2004), No. 4, p. 675.
Slag Atlas, 2nd Ed., Edited by VDEh, Verlag Sthaleisen GmbH, Germany, 1995, p. 6.
Z. Wang, Q.F. Shu, and K.C. Chou, Structure of CaO-B2O3-SiO2-TiO2 glasses: a Raman spectral study, ISIJ Int., 51(2011), No. 7, p. 1021.
Y. Ukyo and K.S. Goto, Measurement of quasi-binary interdiffusivities of various oxides in liquid slags, Tetsu-to-Hagane, 68(1982), No. 14, p. 1981.