In situ observation of the dissolution of spherical alumina particles in CaO-Al2O3-SiO2 melts

被引：70

作者：

Liu, Junhu ^{[1
]}

Verhaeghe, Frederik ^{[1
]}

Guo, Muxing ^{[1
]}

Blanpain, Bart ^{[1
]}

Wollants, Patrick ^{[1
]}

机构：

[1] Katholieke Univ Leuven, Dept Met & Mat Engn, BE-3001 Louvain, Belgium

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2007年 / 90卷 / 12期

关键词：

D O I：

10.1111/j.1551-2916.2007.02062.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The dissolution of alumina spheres in a synthetic CaO-Al2O3-SiO2 (CAS) slag was investigated in situ with a confocal scanning laser microscope (CSLM) in the temperature range between 1470 degrees and 1630 degrees C. Through image analysis, the evolution of the apparent particle radius is obtained as a function of time, exhibiting a clear temperature dependence. The rate-limiting step of the dissolution process is first evaluated with respect to the classical shrinking core model. Neither the boundary layer diffusion nor the chemical reaction in this model can fully explain the dissolution phenomena. By comparing the experimental results with numerical simulation, the rate-limiting step was shown to be diffusion in the majority of the tests. Effective binary diffusion coefficients were calculated.

引用

页码：3818 / 3824

页数：7

共 21 条

[1] SECOND PHASE DISSOLUTION [J].

AARON, HB ;

KOTLER, GR .

METALLURGICAL TRANSACTIONS, 1971, 2 (02) :393-&

[2] FactSage thermochemical software and databases [J].

Bale, C ;

Chartrand, P ;

Degterov, SA ;

Eriksson, G ;

Hack, K ;

Ben Mahfoud, R ;

Melançon, J ;

Pelton, AD ;

Petersen, S .

CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY, 2002, 26 (02) :189-228

[3] DIFFUSION-CONTROLLED DISSOLUTION OF PLANAR, CYLINDRICAL, AND SPHERICAL PRECIPITATES [J].

BROWN, LC .

JOURNAL OF APPLIED PHYSICS, 1976, 47 (02) :449-458

[4] ''In-situ'' real time observation of planar to cellular and cellular to dendritic transition of crystals growing in Fe-C alloy melts [J].

Chikama, H ;

Shibata, H ;

Emi, T ;

Suzuki, M .

MATERIALS TRANSACTIONS JIM, 1996, 37 (04) :620-626

[5] Dissolution of ZrO2, Al2O3, MgO and MgAl2O4 particles in a B2O3 containing commercial fluoride-free mould slag [J].

Fox, AB ;

Valdez, ME ;

Gisby, J ;

Atwood, RC ;

Lee, PD ;

Sridhar, S .

ISIJ INTERNATIONAL, 2004, 44 (05) :836-845

[6] Separation and dissolution of Al2O3 inclusions at slag/metal interfaces [J].

Lee, SH ;

Tse, C ;

Yi, KW ;

Misra, P ;

Chevrier, V ;

Orrling, C ;

Sridhar, S ;

Cramb, AW .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 2001, 282 (01) :41-48

[7]

Levenspiel O., 1999, CHEM REACTION ENG

[8] In situ observation of the direct and indirect dissolution of MgO particles in CaO-Al2O3-SiO2-based slags [J].

Liu, J. ;

Guo, M. ;

Jones, P. T. ;

Verhaeghe, F. ;

Blanpain, B. ;

Wollants, P. .

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2007, 27 (04) :1961-1972

[9] Effect of changing slag composition on spinel inclusion dissolution [J].

Monaghan, B. J. ;

Chen, L. .

IRONMAKING & STEELMAKING, 2006, 33 (04) :323-330

[10]

Monaghan B.J., 2004, VII International Conference on Molten Slags Fluxes and Salts, The South African Institute of Mining and Metallurgy, V42, P585

← 1 2 3 →