摘要
围绕两种新型耐火材料展开,即钢包精炼用高性能低碳镁碳耐火材料以及超低氧钢用耐火材料,初步实验表明,将大尺寸的碳硅化铝(Al4SiC4)引入到镁碳砖(MgO−C)中不仅可以提高其抗氧化能力,又能对含碳耐火材料氧化后的疏松结构进行修复,有望成为新一代钢包精炼用高性能低碳镁碳耐火材料;CaO−MgO−Al2O3(CMA)材料兼具优异的热机械和耐渣侵性能的同时,还可以在服役过程产生低熔点精炼渣相,具备净化钢水的潜力.可以预见,上述功能化新型耐火材料有望为高品质钢的进一步发展提供有力材料支撑.
Every significant technical advancement of the steel industry has depended on the support of refractories used as lining materials in various smelting containers.With the increasing demand for high-quality steels,the precise control of inclusions has become increasingly important.Existing technologies and equipment can effectively reduce the amount and average size of inclusions,but they cannot guarantee the complete removal of large-sized ones.In the steel-making process,refractories in close contact with molten steel are a main source of large-sized non-metallic inclusions;these can become bottlenecks,restricting improvements in steel quality.Based on this problem,the design,preparation,and application of new functional refractories become a critical focus for further development in the steel industry.These refractories are required to possess not only excellent thermo-mechanical properties(i.e.,zero or reduced contaminant for the molten steel),but also the ability to remove inclusions with a high melting point in molten steel.However,available refractories are in their primary stages depending on experience,resulting in no breakthroughs in the precise control of inclusions,and even contamination of molten steel.This study focused on two new refractory materials,namely large-sized Al4SiC4 with controllable morphology,and Al2O3−MgO−CaO(CMA)with a ternary-layer structure.Preliminary experiments show that,with the introduction of the large-sized Al4SiC4,oxidation resistance of MgO−C bricks is improved,and the loose structure resulting from the oxidation of carbon-containing materials can be repaired.CMA materials not only possess excellent thermo-mechanical properties and high slag resistance,but also can produce refining slag phases with a low melting point.This can contribute to the floating of inclusions,thus exhibiting the potential for purifying molten steel.These new,functional refractories should offer strong support for the further development of high-quality steels.
作者
王恩会
陈俊红
侯新梅
WANG En-hui;CHEN Jun-hong;HOU Xin-mei(Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《工程科学学报》
EI
CSCD
北大核心
2019年第12期1520-1526,共7页
Chinese Journal of Engineering
基金
国家自然科学基金资助项目（51904021,51974021,51874027）
中央高校基本科研业务费资助项目（FRF-TP-19-008A1）
国家优秀青年基金资助项目（51522402）
关键词
耐火材料
结构设计
可控制备
高品质钢
工业应用
refractory
microstructure design
controllable preparation
high-quality steels
industrial application
