基于热丝法对CaO-SiO2-Al2O3保护渣结晶性能与凝固分数的研究

doi:10.12068/j.issn.1005-3026.2015.07.013

东北大学学报:自然科学版 ›› 2015, Vol. 36 ›› Issue (7): 970-975.DOI: 10.12068/j.issn.1005-3026.2015.07.013

基于热丝法对CaO-SiO₂-Al₂O₃保护渣结晶性能与凝固分数的研究

周振宇，唐萍，文光华，刘强

(重庆大学材料科学与工程学院，重庆400045)

收稿日期:2014-06-09 修回日期:2014-06-09 出版日期:2015-07-15 发布日期:2015-07-15
通讯作者: 周振宇
作者简介:周振宇(1989-)，男，湖南岳阳人，重庆大学博士研究生；唐萍(1962-)，女，重庆人，重庆大学教授；文光华(1963-)，男，重庆人，重庆大学教授.
基金资助:
国家自然科学基金资助项目(51274260).

Study on Crystallization and Solidification Behaviors of CaO-SiO₂-Al₂O₃ Mold Slags with Hot Thermocouple Technique

ZHOU Zhen-yu， TANG Ping， WEN Guang-hua， LIU Qiang

College of Material Science and Engineering， University of Chongqing， Chongqing 400045， China.

Received:2014-06-09 Revised:2014-06-09 Online:2015-07-15 Published:2015-07-15
Contact: ZHOU Zhen-yu
About author:-
Supported by:
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摘要/Abstract

摘要： 针对髙铝包晶钢连铸设计了CaO-SiO₂-Al₂O₃系保护渣.采用单丝法研究w(CaO)/w(Al₂O₃)对保护渣结晶性能的影响；采用双丝法模拟了保护渣渣膜形成及凝固过程，研究了w(CaO)/w(Al₂O₃)对保护渣固相体积分数φ的影响.结果表明:实验保护渣系结晶能力随w(CaO)/w(Al₂O₃)增大而增强，按结晶能力分为两个区间，w(CaO)/w(Al₂O₃)＞1.30时保护渣结晶能力强于w(CaO)/w(Al₂O₃)≤1.30的保护渣；在等温结晶过程中，w(CaO)/w(Al₂O₃)=1.00的实验保护渣中析出枪晶石，w(CaO)/w(Al₂O₃)=2.50时渣中析出硅酸二钙；w(CaO)/w(Al₂O₃)增大使保护渣渣膜双丝间固相体积分数增大，结晶层增厚，不利于保证结晶器内润滑.与浇注常规包晶钢的CaO-SiO₂系保护渣性能对比表明，CaO-SiO₂-Al₂O₃系保护渣在w(CaO)/w(Al₂O₃)≤1.30时的结晶能力和固相体积分数都与对照渣相近，设计的CaO-SiO₂-Al₂O₃系保护渣适用于高铝包晶钢连铸.

关键词: CaO-SiO₂-Al₂O₃保护渣, 钙铝质量分数比, 结晶性能, 渣膜模拟, 固相体积分数

Abstract: A mold slag based on CaO-SiO₂-Al₂O₃ system was designed for casting high-aluminum peritectic steels. Single hot thermocouple technique (SHTT) was applied to study the impact of w(CaO)/w(Al₂O₃) on crystallization behaviors. Double hot thermocouple technique (DHTT) was used to simulate the formation of slag film and define the impact of w(CaO)/w(Al₂O₃) on solidification fraction. The results show that the slags can be divided into two groups according to crystallization characters: the group with w(CaO)/w(Al₂O₃) higher than 1.30 (Group Ⅱ) has a higher tendency of crystallization than that with w(CaO)/w(Al₂O₃) lower 1.30 (Group Ⅰ). Cuspidine (Group Ⅰ) and dicalcium silicate (Group Ⅱ) were precipitated respectively in these two groups during isothermal process. As the w(CaO)/w(Al₂O₃) increased， the crystallization tendency increased sharply which causes the solidification fraction in slag film increased. The slags were also compared with industrial slag used for casting common peritectic steels， showing that the slags with w(CaO)/w(Al₂O₃)≤1.30 have similar properties with industrial slag. The designed CaO-SiO₂-Al₂O₃slag can be used in casting high-aluminum peritectic steels.

Key words: CaO-SiO₂-Al₂O₃ mold slag, w(CaO)/w(Al₂O₃), crystallization behaviors, slag film simulation, solidification fraction

中图分类号:

TG335.58

周振宇，唐萍，文光华，刘强. 基于热丝法对CaO-SiO₂-Al₂O₃保护渣结晶性能与凝固分数的研究[J]. 东北大学学报:自然科学版, 2015, 36(7): 970-975.

ZHOU Zhen-yu， TANG Ping， WEN Guang-hua， LIU Qiang. Study on Crystallization and Solidification Behaviors of CaO-SiO₂-Al₂O₃ Mold Slags with Hot Thermocouple Technique[J]. Journal of Northeastern University Natural Science, 2015, 36(7): 970-975.

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基于热丝法对CaO-SiO₂-Al₂O₃保护渣结晶性能与凝固分数的研究

Study on Crystallization and Solidification Behaviors of CaO-SiO₂-Al₂O₃ Mold Slags with Hot Thermocouple Technique

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