摘要
用感应炉浸渍试验法研究低碳镁碳砖和普通镁碳砖对攀枝花钢铁(集团)公司钢包渣的抗侵蚀能力。采用SEM和EDS分析方法研究侵蚀后试样的显微结构及化学组成的变化。结果表明,普通镁碳砖脱碳层厚度是低碳镁碳砖脱碳层厚度的2.4倍,碳氧化后其组织结构疏松,并且生成大量低熔点CMS和CaSiO3。这些低熔点化合物形成连续相渗透于MgO颗粒周围,分解镁砂,使骨料破坏,加速MgO-C砖的损毁。而低碳镁碳砖碳氧化后形成微细化气孔,此微孔中生成的高熔点化合物MA容易过饱和而沉淀,因此增加了固-固直接结合程度,使脱碳层的组织结构较为致密,提高了材料的抗渣侵蚀性能。
The corrosion resistance of MgO-C brick and low-carbon MgO-C brick to ladle slag of Panzhihua Iron and Steel Co. is investigated by immersion test in induction furnace （1 680±30℃ in melting tank for 20 min）. The microstructure and chemical compositions of specimens after slag test are studied by SEM and EDS analysis. The results show that the depth of decarburization layer in MgO-C brick is 2.4 times that of low-carbon MgO-C brick; the structure of MgO-C is loosened after decarburization and there grow a lot of low melting point CMS and CaSiO3, which form continuous phase and infiltrate into MgO grain boundary leading to the decomposition of MgO and ultimately accelerating the damage to MgO-C brick. By contrast, a lot of micropores form in low-carbon MgO-C after decarburization, and the high melting point MA is easy to supersaturate and deposit in the micropores, which enhances the degree of solid-solid direct bonding, leading to the high density of decar-burization layer and the improvement of the slag resistance of the material.
出处
《武汉科技大学学报》
CAS
2009年第4期394-398,共5页
Journal of Wuhan University of Science and Technology
关键词
显微结构
低碳镁碳砖
抗渣性
microstructure
low-carbon MgO-C brick
slag resistance
