摘要
采用静态熔滴法研究了模拟高炉软熔带渣对原位TiN/O′sialon材料的侵蚀机制。利用高温X射线透视装置观察炉渣的熔化和与材料的相互作用过程。XRD分析残渣中的物相 ,EPM分析材料被侵蚀部位的显微结构和元素分布。结果表明 :熔渣对材料的侵蚀主要是熔渣渗透并与材料发生化学反应。材料被侵蚀后结构发生变化 ,可大致分为渣带、渗透带和未变带。熔渣与材料相互作用生成的新的高熔点相以及熔入的TiN使熔渣的粘度增大、流动性降低 ,进而阻止熔渣的进一步侵入。材料中TiN含量的增加将提高材料的抗渣侵蚀能力。
Corrosion mechanism of in-situ TiN/O'-sialon composites exposed to simulated blast furnace (BF) cohesive zone slag was investigated by means of static droplet method. High-temperature X-ray fluoroscopy was used to monitor the melting of slag and the interaction process between slag and the materials. Phase composition of residue slag was analyzed by XRD. The microstructure, element distribution and corrosion depth of the corroded region of the materials were observed and determined by EPM. The results show that the main corrosion mechanism of TiN/O'-sialon is the penetration of molten slag and the chemical reaction between the material and molten slag. After being corroded, the structure of TiN/O'-sialon material changes to form slag zone, penetrated zone and unchanged zone. During corrosion process, some newly formed high-melting-point phases by the interaction between molten slag and the material and TiN in the material cause the increase of viscosity of the molten slag and the decrease of fluidity, which will prevent the further corrosion. Therefore the corrosion resistance to slag of the materials can be improved by the increase of TiN content.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2004年第8期992-996,共5页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金 ( 5 98740 12 )
教育部高等学校骨干教师计划基金 [教技司 ( 2 0 0 0 6 5 ) ]
辽宁省科学技术基金( 0 0 2 0 0 9)资助项目。
关键词
氮化钛/O’-硅铝氧氮化物材料
高炉软熔带渣
侵蚀
Blast furnaces
Corrosion resistance
Fluidity
Microstructure
Phase composition
Slags
Titanium nitride
Viscosity
