B2O3对CaO-Al2O3-SiO2基连铸保护渣性能及结构的影响

doi:10.11896/cldb.19010018

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Abstract In this study, thermodynamics software was employed to calculate the ternary phase diagram of CaO-Al₂O₃-SiO₂ and the quaternary phase diagram of CaO-Al₂O₃-B₂O₃-SiO₂ first. Then, the specific contents of the main components of B₂O₃ and CaO-Al₂O₃-SiO₂ slag system were determined according to the principle of low melting point selection. The melting and crystallization properties of B₂O₃ mold flux with various contents were studied experimentally by means of Brookfield rotational viscometer and DHTT-II melting crystallization temperature tester. Furthermore, the simulation of the molten slag was conducted by the molecular dynamics software. The microstructure of the mold flux was analyzed and an in-depth discussion of the relationship between the properties and the structure of the mold flux was carried out. It could be found from the results that B₂O₃ exerted an exceptional effect on the viscosity and transition temperature of CaO-Al₂O₃-SiO₂ system. When the content of B₂O₃ was no higher than 9%, the increase of B₂O₃ content would result in sharp reduction in viscosity and transition temperature of the slag. Additio-nally, the growing B₂O₃ content in the mold flux also leaded to prolonging of the crystallization time and complete crystallization time of the mold flux. The B-O coordination structure is the most stable compared to the Al-O and Si-O coordination structures. In this system, B ions can replace Si and Al ions to form a B-O tricoordinate structure and a B-O tetracoordinate structure. Meanwhile, the structure altered from a compact framework structure to a relaxed layer structure, accompanied by a lowered slag polymerization degree and a declined viscosity.

Key words： mold flux viscosity diboron trioxide microstructure molecular dynamics simulation

Published: 28 April 2019

CLC number:

TF777

Fund:This work was financially supported by the National Natural Science Foundation of China (51774141), the National Natural Science Foundation Youth Fund of China (51404088), Natural Science Foundation of Hebei Province(E2015209217, E2018209195).

About author:: Xingjuan Wang, is an associate professor at the College of Metallurgy and Energy, North Chian University of Science and Technology. In 2002, she graduated from Hebei Polytechnic University with a bachelor's degree in College of Metallurgy and Energy. In 2005, she graduated from the same school with a master's degree. And she received her Ph.D. degree in University of Science and Technology Beijing in 2013. Her research interests are technical innovation and process optimization for defect-free solidification and high efficiency continuous casting.

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	WANG Xingjuan
	JIN Hebin
	ZHU Liguang
	PIAO Zhanlong
	WANG Bo
	QU Shuo

Cite this article:

WANG Xingjuan,JIN Hebin,ZHU Liguang, et al. Effect of B₂O₃ on Properties and Structure of CaO-Al₂O₃-SiO₂ Continuous Casting Mold Flux[J]. Materials Reports, 2019, 33(8): 1395-1400.

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http://www.mater-rep.com/EN/10.11896/cldb.19010018 OR http://www.mater-rep.com/EN/Y2019/V33/I8/1395

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