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| Effect of CaO/Al2O3 ratio on viscosity and structure of CaO–Al2O3-based fluoride-free mould fluxes |
| Qi Wang1, Ji-an Yang1, Chen Zhang2, De-xiang Cai2, Jian-qiang Zhang1, Oleg Ostrovski1 |
| 1 School of Materials Science and Engineering, University of New South Wales, Sydney 2052, Australia
2 Baosteel Group Corporation Research Institute, Shanghai 201900, China |
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Abstract The effects of CaO/Al2O3 ratio on viscosity and structure of the CaO-Al2O3-based fluoride-free mould fluxes were investigated with the CaO/Al2O3 ratio varied from 1 to 4 and the content of SiO2 fixed at 7 wt.%. The increase in the CaO/Al2O3 ratio from 1 to 2 lowered the viscosity of the flux melts. The viscosity increased slightly with the CaO/Al2O3 ratio from 2 to 3, and this increase became significant with further increasing CaO/Al2O3 ratio to 4. Both break temperature and apparent activation energy were found to be increased with the increase in CaO/Al2O3 ratio from 2 to 4. There was no break temperature available in the flux with CaO/Al2O3 ratio of 1. Changing the CaO/Al2O3 ratio from 1 to 2 decreased the apparent activation energy. Equilibrium phases of the fluxes were calculated using FactSage 7.1 and the major phases were found to be varied with the CaO/Al2O3 ratio. Structures of tested mould fluxes were analysed using Fourier transform infrared spectroscopy. The results showed that the increase in the CaO/Al2O3 ratio from 1 to 2 decreased the complexity of the structure, leading to a reduced viscosity. With the increase in the CaO/Al2O3 ratio from 2 to 4, both solid phase precipitation and melt structure contributed to the variation of viscosity.
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Received: 14 October 2018
Published: 10 January 2019
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| Cite this article: |
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Qi Wang,Ji-an Yang,Chen Zhang, et al. Effect of CaO/Al2O3 ratio on viscosity and structure of CaO–Al2O3-based fluoride-free mould fluxes[J]. Journal of Iron and Steel Research International, 2019, 26(4): 374-384.
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2019, Vol. 26 
