Journal of Inorganic Materials ›› 2016, Vol. 31 ›› Issue (5): 547-554.DOI: 10.15541/jim20150516

• Orginal Article • Previous Articles     Next Articles

Isothermal Crystal Growth Behavior of CaSiO3 in Ternary Oxide Melts

LIU Jing-Jing1, HEULENS Jeroen2, GUO Mu-Xing1, MOELANS Nele1   

  1. (1. Department of Materials Engineering, KU Leuven, B-3001 Heverlee, Belgium; 2. Umicore Precious Metals Refining, B-2660 Hoboken, Belgium)
  • Received:2015-10-21 Online:2016-05-20 Published:2016-04-25
  • About author:LIU Jing-Jing (1983–), female, candidate of PhD. E-mail: jingjing.liu@mtm.kuleuven.be
  • Supported by:
    High Performance Computer from VSC (Flemish Supercomputer Centrum)

Abstract:

The process of isothermal wollastonite (CaSiO3) crystallization in the CaO-Al2O3-SiO2 system was simulated using a phase field model coupled with the FACTSage Toxide thermodynamic database. The effects of composition and temperature on the crystallization behaviour were studied. The simulations show that for the considered cases, the wollastonite morphology is mainly determined by anisotropy in the interface energy and hardly affected by anisotropy in the interface kinetics. In agreement with the observations from in-situ experiments, the simulations show a transition from planar to dendritic growth with decreasing temperature and the dendritic structure becomes finer when the temperature is decreased in further. The growth rates and dendrite tip radii obtained in the simulations agree well with Ivanstov’s theory and are of the same orders of magnitude as those measured experimentally.

Key words: crystal growth, morphology, CaSiO3, phase field

CLC Number: