B2O3对CaO-Al2O3-SiO2基连铸保护渣性能及结构的影响

doi:10.11896/cldb.19010018

材料导报

2019, Vol. 33

Issue (8): 1395-1400 https://doi.org/10.11896/cldb.19010018

金属与金属基复合材料

B₂O₃对CaO-Al₂O₃-SiO₂基连铸保护渣性能及结构的影响

王杏娟^1,2, 靳贺斌^1,2, 朱立光^1,2, 朴占龙^2,3, 王博^1,2, 曲硕^1,2

1 华北理工大学冶金与能源学院,唐山 063210
2 河北省高品质钢连铸工程技术研究中心,唐山 063000
3 北京科技大学冶金与生态工程学院,北京 100083

Effect of B₂O₃ on Properties and Structure of CaO-Al₂O₃-SiO₂ Continuous Casting Mold Flux

WANG Xingjuan^1,2, JIN Hebin^1,2, ZHU Liguang^1,2, PIAO Zhanlong^2,3, WANG Bo^1,2, QU Shuo^1,2

1 College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210
2 Hebei Engineering Research Center of High Quality Steel Continuous Casting, Tangshan 063000
3 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083

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摘要采用热力学软件计算了CaO-Al₂O₃-SiO₂三元相图和CaO-Al₂O₃-B₂O₃-SiO₂四元相图。根据低熔点选择原则,确定了B₂O₃和CaO-Al₂O₃-SiO₂渣系主要成分的具体含量。采用Brookfield旋转黏度计和DHTT-Ⅱ型熔化结晶温度测定仪对不同B₂O₃含量保护渣的熔化性能和结晶性能进行了实验研究。进一步采用分子动力学软件对熔渣进行模拟,分析了保护渣的微观结构,深入探讨了保护渣性能与结构之间的关系。结果表明,B₂O₃对CaO-Al₂O₃-SiO₂渣系的黏度和转折温度有着重要的影响。当B₂O₃含量不高于9%时,保护渣的黏度和转折温度随着B₂O₃含量的提高显著降低。保护渣中B₂O₃含量的提高导致保护渣结晶孕育时间和完全结晶时间延长。相对于Al-O和Si-O配位结构,B-O配位结构最为稳定。体系中B离子可以代替Si、Al离子,形成B-O三配位结构与B-O四配位结构,体系结构由紧密的架状结构转变为松弛的层状结构,熔渣聚合度降低、黏度也降低。

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	王杏娟
	靳贺斌
	朱立光
	朴占龙
	王博
	曲硕

关键词: 保护渣黏度三氧化二硼微结构分子动力学计算

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

出版日期: 2019-04-25 发布日期: 2019-04-28

ZTFLH:

TF777

基金资助: 国家自然科学基金(51774141);国家自然科学基金青年基金(51404088);河北省自然科学基金(E2015209217;E2018209195)

作者简介: 王杏娟,华北理工大学冶金与能源学院副教授。2002年河北理工学院冶金系本科毕业,2005年同校系硕士研究生毕业留校任教,2013年获北京科技大学博士学位,email: wxingjuan@ncst.edu.cn。主要研究方向为无缺陷凝固与高效化连铸的技术创新与工艺优化。

引用本文:

王杏娟, 靳贺斌, 朱立光, 朴占龙, 王博, 曲硕. B₂O₃对CaO-Al₂O₃-SiO₂基连铸保护渣性能及结构的影响[J]. 材料导报, 2019, 33(8): 1395-1400.
WANG Xingjuan, JIN Hebin, ZHU Liguang, PIAO Zhanlong, WANG Bo, QU Shuo. Effect of B₂O₃ on Properties and Structure of CaO-Al₂O₃-SiO₂ Continuous Casting Mold Flux. Materials Reports, 2019, 33(8): 1395-1400.

链接本文:

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

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