BaO对CaO-Al<sub>2</sub>O<sub>3</sub>基保护渣熔化温度、结晶及微观结构的影响

doi:10.13228/j.boyuan.issn1005-4006.20210011

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摘要 CaO-Al₂O₃基保护渣在解决高铝钢连铸过程渣-金反应性问题中展现了巨大潜力,但仍存在结晶能力过强、熔化温度偏高等问题。因此,研究了BaO对CaO-Al₂O₃-CaF₂-B₂O₃-Na₂O-Li₂O-MgO多元渣系熔化温度、结晶行为和微观结构的影响。研究结果表明,BaO的加入降低了渣系软化温度和熔化温度,随着BaO含量的增加,降低程度减弱;BaO的加入使渣系结晶相由Ca₁₂Al₁₄O₃₃和Ca₃B₂O₆ 2相共同析出转变为Ca₁₂Al₁₄O₃₃、Ca₃B₂O₆和BaAl₂O₄ 3相共同析出,且随着BaO 的增加,渣系结晶温度降低,结晶能力减弱;Ba²⁺对[AlO₄]^5-具有较强电价补偿效应,使其能够稳定存在,Al-O网络结合更为紧密,游离O^2-难以进入孔隙中破坏桥氧链接,从而导致网络聚合度轻微升高,原子扩散能力降低,提高了结晶动力学势垒,抑制了结晶。

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	冯鑫
	姚稳
	黎江玲

关键词 ： BaO, CaO-Al₂O₃渣, 熔化温度, 结晶行为, 微观结构

Abstract：CaO-Al₂O₃-based mold flux has showed great potential in solving reactivity problem for high-aluminum steel casting, but it still has problems such as strong crystallization ability and high melting temperature. Therefore, the influence of BaO on melting temperature, crystallization behavior and structure of CaO-Al₂O₃-CaF₂-B₂O₃-Na₂O-Li₂O-MgO multiple slag systems were investigated. The results showed that the addition of BaO can reduce the softening temperature and melting temperature. As an increased BaO, the trend of this reduction decreases.Ca₁₂Al₁₄O₃₃ and Ca₃B₂O₆ 2 phase precipitate into Ca₁₂Al₁₄O₃₃、Ca₃B₂O₆ and BaAl₂O₄ 3 phase precipitate with the addition of Bao. The crystallization ability has been decreased as an increased BaO. Ba²⁺ has a strong electricity charge compensation effect on [AlO₄]^5-, so that [AlO₄]^5- can exist stably, and the Al-O network is more tightly combined. It is difficult for free O^2- to enter the gap to destroy the bridge oxygen link, which leads to the slight increase of polymerization. This will reduce the atom diffusion ability, resulting in that the increase of crystallization kinetic barrier decreases the crystallization ability.

Key words： BaO CaO-Al₂O₃-based mlod flux melting temperature crystallization behavior structure

收稿日期: 2021-01-14

引用本文:

冯鑫, 姚稳, 黎江玲. BaO对CaO-Al₂O₃基保护渣熔化温度、结晶及微观结构的影响[J]. 连铸, 2021, 40(2): 38-42. FENG Xin, YAO Wen, LI Jiang-ling. Effect of BaO on melting temperature, crystallization and structure of CaO-Al₂O₃ based mold flux. CONTINUOUS CASTING, 2021, 40(2): 38-42.

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[1]	韩文殿,仇圣桃,朱果灵.无氟结晶器保护渣的发展[J]. 钢铁研究, 2003, 31(2):53.
[2]	宋土顺,朱立光,王杏娟,等.Q345B钢保护渣显微结构及矿相组成研究[J].连铸,2017 (5):29.
[3]	朱立光, 袁志鹏, 肖鹏程, 等. 低碳钢薄板坯高速连铸保护渣研究与优化[J]. 钢铁, 2020, 55(11): 65.
[4]	干勇,杨卯生.特种合金钢选用与设计[M].北京:化学工业出版社,2015.
[5]	贾凤翔,侯若明,贾晓滨.不锈钢性能及选用[M].北京:化学工业出版社,2013.
[6]	YAN X,YUAN H,ZHANG S,et al.Effect of interfacial reaction between CaO-BaO-Al2O3-based mold fluxes and high-Mn-high-Al steels on fundamental properties and lubrication of mold flux[J]. Steel Research International, 2020, 91(6): 1900581.
[7]	吴婷.低反应性连铸保护渣熔体的微结构特征及宏观性能研究[D]. 重庆:重庆大学,2017.
[8]	艾新港,韩东,李胜利,等. 外加液态保护渣连铸生产实践与前景展望[J]. 钢铁, 2019, 54(8): 132.
[9]	Cho J W,Blazek K,Frazee M,et al.Assessment of CaO-Al2O3 based mold flux system for high aluminum TRIP casting[J]. ISIJ International, 2013, 53(1): 62.
[10]	宝山钢铁股份有限公司.一种高铝钢用连铸保护渣及其制造方法:中国,200710042540.6 [P/OL]. 2008-12-31[2010-05-19].http://pss-system.cnipa.gov.cn/sipopublicsearch/patentsearch/showViewList-jumpToView.shtml.
[11]	Cho J W,Blazek K E,Frazee M J,et al. Development of CaO-Al2O3 based mold flux system for high aluminum TRIP casting[C]//9th International Conference on Molten Slags, Fluxes and Salts. Beijing:[s.n.], 2012.
[12]	WU T,WANG Q,HE S,et al. Study on properties of alumina-based mould fluxes for high-Al steel slab casting[J]. Steel Research International, 2012, 83(12): 1194.
[13]	LI J,LAI F,YAO W,et al. Effects of the cooling rate on the crystallization behaviors of the CaO-Al2O3-B2O3-CaF2-based mold flux[J]. Cryst Eng Comm, 2020, 22(12): 2158.
[14]	余杰,王万林,肖丹,等. MgO和BaO对CaO-Al2O3系保护渣熔化与结晶行为的影响[J]. 连铸, 2018 (4):37.
[15]	PIAO Z,ZHU L,WANG X,et al. Effect of BaO on the viscosity and structure of fluorine-free calcium silicate-based mold flux[J]. Journal of Non-Crystalline Solids, 2020, 542: 120111.
[16]	LU B,WANG W. Effects of fluorine and BaO on the crystallization behavior of Lime-Alumina-based mold flux for casting high-Al steels[J]. Metallurgical and Materials Transactions B, 2015, 46(2): 852.
[17]	ZHU C Y,HAN W D,LIU C J,et al. Crystallization temperature and crystallization ratio of mold flux[J]. Journal of Iron and Steel Research, International, 2005, 12(6): 23.
[18]	GAO E,WANG W,ZHANG L. Effect of alkaline earth metal oxides on the viscosity and structure of the CaO-Al2O3 based mold flux for casting high-al steels[J]. Journal of Non-Crystalline Solids, 2017, 473: 79.
[19]	LI J,CHOU K,SHU Q. Structure and viscosity of CaO-Al2O3-B2O3 based mould fluxes with varying CaO/Al2O3 mass ratios[J]. ISIJ International, 2020, 60(1): 51.
[20]	Neuville D R,Cormier L,Massiot D. Al coordination and speciation in calcium aluminosilicate glasses: Effects of composition determined by 27Al MQ-MAS NMR and Raman spectroscopy[J]. Chemical Geology, 2006, 229(1/2/3): 173.
[21]	Licheron M,Montouillout V,Millot F,et al. Raman and 27Al NMR structure investigations of aluminate glasses:(1-x) Al2O3-x MO, with M= Ca, Sr, Ba and 0.5< x< 0.75[J]. Journal of Non-crystalline Solids, 2011, 357(15): 2796.
[22]	Osipova L M,Osipov A A,Bykov V N. Structure of high-alkali melts in the lithium borate system from vibrational spectroscopic data[J]. Glass Physics and Chemistry, 2007, 33(5): 486.
[23]	刘克,韩毅华,杨帆,等.MgO对CaO-Al2O3基四元系保护渣熔渣微结构的影响[J].钢铁,2020,55(5):52.
[24]	王翊, 汪易航, 杨树峰. BOF-LF-VD-CC生产37Mn5钢夹杂物的行为演变[J]. 中国冶金, 2020, 30(2): 26.