不锈钢冶炼用铁水包Al2O3-SiC-C内衬砖的性能与侵蚀机理

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (1): 329-337.

所属专题：耐火材料

不锈钢冶炼用铁水包Al₂O₃-SiC-C内衬砖的性能与侵蚀机理

程艳俏¹, 赵惠忠¹, 潘料庭², 余俊¹, 谈利强³, 刘丛平⁴

1.武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉 430081;
2.广西北港新材料有限公司,北海 536000;
3.浙江父子岭特种耐火有限公司,湖州 313100;
4.浙江宏丰炉料有限公司,湖州 313100

收稿日期:2022-08-09 修订日期:2022-09-30 出版日期:2023-01-15 发布日期:2023-02-15
通信作者: 赵惠忠,博士,教授。E-mail:wustnano@163.com
作者简介:程艳俏(1994—),女,硕士研究生。主要从事耐火材料方面的研究。E-mail:1343914518@qq.com
基金资助:
国家自然科学基金(51804233);校企合作基金(2021H20006)

Performance and Corrosion Mechanism of Molten Iron Ladle Al₂O₃-SiC-C Lining Bricks for Stainless Steel Smelting

CHENG Yanqiao¹, ZHAO Huizhong¹, PAN Liaoting², YU Jun¹, TAN Liqiang³, LIU Congping⁴

1. The State Key Laboratory of Refractory and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;
2. Guangxi Beigang New Materials Co., Ltd., Beihai 536000, China;
3. Zhejiang Fuziling Special Fire Resistance Co., Ltd., Huzhou 313100, China;
4. Zhejiang Hongfeng Furnace Material Co., Ltd., Huzhou 313100, China

Received:2022-08-09 Revised:2022-09-30 Online:2023-01-15 Published:2023-02-15

摘要/Abstract

摘要： 铁水包内衬材料长期服役于间隔周期较长的高、低温交替环境,极易发生剥落与侵蚀损毁。为了探索影响铁水包内衬材料使用寿命的主要因素,对市面上四种铁水包Al₂O₃-SiC-C内衬砖的化学成分、物相组成、物理性能和微观结构进行了分析,并以高炉渣为侵蚀介质,重点研究了不锈钢冶炼用铁水包Al₂O₃-SiC-C内衬砖的侵蚀机理。结果表明:铁水包Al₂O₃-SiC-C内衬砖中Al₂O₃含量越高,高温下制品的液相量越低,越有利于提高耐火砖的高温力学性能;随着含碳量的增加,铁水包Al₂O₃-SiC-C内衬砖的抗渣性得到明显改善,但抗氧化性及高温抗折强度呈下降趋势;高炉渣中CaO、MgO向耐火砖中渗透,与耐火砖中的Al₂O₃、SiO₂发生反应形成高熔点的镁铝尖晶石及低熔点的钙长石等,生成的低熔相会加剧耐火砖的侵蚀。

关键词: 不锈钢冶炼, 铁水包, Al₂O₃-SiC-C内衬砖, 高炉渣, 抗渣性, 抗氧化性

Abstract: The molten iron ladle lining material has long service in alternating environments with long intervals of high and low temperatures, which is very prone to peeling and corrosion damage. To explore the main factors affecting the service life of the molten iron ladle lining material, the chemical composition, phase composition, physical properties and microstructure of the four molten iron ladle Al₂O₃-SiC-C lining bricks on the market were analyzed. The corrosion mechanism of molten iron ladle Al₂O₃-SiC-C lining brick for stainless steel smelting was mainly studied by using blast furnace slag as a corrosion medium. The results show that the higher the content of Al₂O₃ in the molten iron ladle Al₂O₃-SiC-C lining brick, the lower the liquid phase content of the product at high temperature, which is more conducive to improving the high temperature mechanical properties of the refractory brick. With the increase of carbon content, the slag resistance of molten iron ladle Al₂O₃-SiC-C lining brick is improved, but the oxidation resistance and high temperature flexural strength show a downward trend. CaO and MgO in the furnace slag penetrate the refractory brick and react with Al₂O₃ and SiO₂ in the refractory brick to form magnesium-aluminum spinel with high melting point and calcium feldspar with low melting point, etc., and the low melting phase will aggravate the corrosion of refractory bricks.

Key words: stainless steel smelting, molten iron ladle, Al₂O₃-SiC-C lining brick, blast furnace slag, slag resistance, oxidation resistance

中图分类号:

TQ175

程艳俏, 赵惠忠, 潘料庭, 余俊, 谈利强, 刘丛平. 不锈钢冶炼用铁水包Al₂O₃-SiC-C内衬砖的性能与侵蚀机理[J]. 硅酸盐通报, 2023, 42(1): 329-337.

CHENG Yanqiao, ZHAO Huizhong, PAN Liaoting, YU Jun, TAN Liqiang, LIU Congping. Performance and Corrosion Mechanism of Molten Iron Ladle Al₂O₃-SiC-C Lining Bricks for Stainless Steel Smelting[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(1): 329-337.

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不锈钢冶炼用铁水包Al₂O₃-SiC-C内衬砖的性能与侵蚀机理

Performance and Corrosion Mechanism of Molten Iron Ladle Al₂O₃-SiC-C Lining Bricks for Stainless Steel Smelting

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