MgO-SiC-C材料的抗渣性能研究  

Slag resistance of MgO-SiC-C composite

作　　者：魏耀武[1] 李楠[1] 陈方玉[2] 曾彤[2] 徐勇[1] 许聚良[1] 蔡鄂汉[1] 

机构地区：[1]武汉科技大学高温陶瓷与耐火材料湖北省重点实验室,武汉430081 [2]武汉钢铁(集团)公司技术中心

出　　处：《耐火材料》2007年第2期89-92,共4页Refractories

摘　　要：以电熔镁砂、碳化硅、鳞片石墨（w（C）〉97%）、铝粉（≤0.088mm,w（Al）〉98%）和硅粉（≤0.088mm,w（Si）〉98%）为主要原料,按w（电熔镁砂）=81%,w（SiC）=10%,w（鳞片石墨）=4%,w（铝粉＋硅粉）=5%的组成配料,以酚醛树脂为结合剂,压制成125mm×25mm×25mm的MgO-SiC-C试样,在220℃干燥24h后采用感应炉法进行了抗转炉终渣试验,并对抗渣试验后试样进行了XRD、SEM和EDAX分析。结果发现熔渣对MgO-SiC-C试样的侵蚀和渗透并不显著,试样的侵蚀速率为0.25~0.3mm·h-1;抗渣试验后试样原质层主要组成为MgO、SiC和MgO·Al2O3;在与熔渣接触后,SiC被氧化成SiO2,由此导致在试样和熔渣间形成一高粘度的液相反应层,有效地减轻了试样受熔渣渗透和侵蚀的程度,提高了试样的抗渣能力。MgO-SiC-C composites were prepared by using fused magnesia,silicon carbide,flake graphite（w（C）〉97%）,Al powder（≤0.088 mm,w（Al）〉98%） and Si powder（≤0.088 mm,w（Si）〉98%）as starting materials,with the composition of 81% fused magnesia,10% silicon carbide,4%flake graphite and 5% Al-Si mixture,phenolic resin as the binder,pressed into the specimens with the size of 125 mm×25 mm×25 mm,dried at 220 ℃ for 24 h.The slag resistance test was operated at induction furnace.The corroded specimens were investigated by XRD,SEM and EDA. The results show that：the slag corrosion and penetration to specimen is not remarkable. The corrosion rate was 0.25 -0.3 mm· h^-1. The non-reactive layer of the corroded specimen was composed of MgO,SiC and MgO·Al2O3. After contacting with molten slag, SiC was oxidized into SiO2 forming a liquid layer with high viscosity on the boundary of molten slag and specimen,which is helpful to decrease the slag corrosion and penetration degree and improve the slag resistance of the MgO -SiC -C composite.

关 键 词：MgO-SiC-C材料 抗渣性能 显微结构 相组成 

分 类 号：TQ175.732[化学工程—硅酸盐工业]