不锈钢冶炼用铁水包Al_(2)O_(3)-SiC-C内衬砖的性能与侵蚀机理  

Performance and Corrosion Mechanism of Molten Iron Ladle Al_(2)O_(3)-SiC-C Lining Bricks for Stainless Steel Smelting

作　　者：程艳俏 赵惠忠[1] 潘料庭 余俊[1] 谈利强 刘丛平 CHENG Yanqiao;ZHAO Huizhong;PAN Liaoting;YU Jun;TAN Liqiang;LIU Congping(The State Key Laboratory of Refractory and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Guangxi Beigang New Materials Co.,Ltd.,Beihai 536000,China;Zhejiang Fuziling Special Fire Resistance Co.,Ltd.,Huzhou 313100,China;Zhejiang Hongfeng Furnace Material Co.,Ltd.,Huzhou 313100,China)

机构地区：[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

出　　处：《硅酸盐通报》2023年第1期329-337,共9页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51804233);校企合作基金(2021H20006)。

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Al_(2)O_(3)-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Al_(2)O_(3)-SiC-C内衬砖的侵蚀机理。结果表明:铁水包Al_(2)O_(3)-SiC-C内衬砖中Al_(2)O_(3)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Al_(2)O_(3)-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Al_(2)O_(3)、SiO 2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。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 Al_(2)O_(3)-SiC-C lining bricks on the market were analyzed.The corrosion mechanism of molten iron ladle Al_(2)O_(3)-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 Al_(2)O_(3)in the molten iron ladle Al_(2)O_(3)-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 Al_(2)O_(3)-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 Al_(2)O_(3)and SiO 2 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.

关 键 词：不锈钢冶炼 铁水包 Al_(2)O_(3)-SiC-C内衬砖 高炉渣 抗渣性 抗氧化性 

分 类 号：TQ175[化学工程—硅酸盐工业]