Effects of Rare Earth Oxide on Viscosity of Mold Fluxes for Continuous Casting
来源期刊：JOURNAL OF RARE EARTHS2005年第1期
论文作者：JIANG Maofa Shi Peiyang Yao Yongkuan Wang Deyong Wang Huihua LIU Chengjun
Key words：mold fluxes for continuous casting; viscosity; solidification temperature; rare earths;
Abstract: The effects of RE (rare earth) oxide on viscosity of mold fluxes were investigated with a rotary viscometer. The results show that: (1) The viscosity of mold fluxes is remarkably increased by RE oxide addition, especially when the mass fraction of RE oxide is more than 10%. (2) By addition of RE oxide, precipitation of the insoluble particles with high melting point from the molten slag with the decreasing of the temperature leads to the increase of viscosity. Viscosity curve shows that RE oxide is soluble in some extent in mold fluxes. When RE oxide is in a state of supersaturation, the existence of insoluble particles also makes the viscosity of mold fluxes increase. (3) Not only the viscosity of mold fluxes can be reduced, but also the capacity to dissolve and absorb RE oxide can be increased by Li2O, B2O3 and BaO. However, the contents of Li2O, B2O3, and BaO should be controlled to suitable levels. (4) The solidification temperature of mold fluxes can be increased by the addition of RE oxide, which is unfavorable to heat transfer and lubrication of mold fluxes between steel shell and mold.
JIANG Maofa1，Shi Peiyang1，Yao Yongkuan1，Wang Deyong1，Wang Huihua2，LIU Chengjun1
(1.College of Materials and Metallurgy, Northeastern University, Shenyang 110004, China;
2.College of Materials of Science and Engineering, Shenyang Institute of Chemical Technology, Shenyang 110442, China)
Abstract:The effects of RE (rare earth) oxide on viscosity of mold fluxes were investigated with a rotary viscometer. The results show that: (1) The viscosity of mold fluxes is remarkably increased by RE oxide addition, especially when the mass fraction of RE oxide is more than 10%. (2) By addition of RE oxide, precipitation of the insoluble particles with high melting point from the molten slag with the decreasing of the temperature leads to the increase of viscosity. Viscosity curve shows that RE oxide is soluble in some extent in mold fluxes. When RE oxide is in a state of supersaturation, the existence of insoluble particles also makes the viscosity of mold fluxes increase. (3) Not only the viscosity of mold fluxes can be reduced, but also the capacity to dissolve and absorb RE oxide can be increased by Li2O, B2O3 and BaO. However, the contents of Li2O, B2O3, and BaO should be controlled to suitable levels. (4) The solidification temperature of mold fluxes can be increased by the addition of RE oxide, which is unfavorable to heat transfer and lubrication of mold fluxes between steel shell and mold.
Key words:mold fluxes for continuous casting; viscosity; solidification temperature; rare earths;
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