硅酸盐学报2017，Vol.45Issue(12)：1860-1866,7.DOI:10.14062/j.issn.0454-5648.2017.12.19
含不同粒度SiC的MgO-Al2O3-C材料服役状态下的侵蚀机理
Degradation of MgO-Al2O3-C Refractories Containing SiC with Different Particle Sizes in Service State
摘要
Abstract
Two kinds of MgO-Al2O3-C (MAC) refractories containing SiC with different particle sizes were examined in the sidewall of refining ladle for 115-135 heats. The results show that the corrosion rate of the MAC refractories is remarkably affected by the particle size of SiC. The corrosion rate of the MAC refractory containing SiC with the median size (i.e.,D50=24.58μm) is 1.05 mm/heat (135 heats), and that of MAC refractory containing SiC with the median size (i.e., D50=4.34μm) is 1.30 mm/heat (115 heats). It is indicated that SiC in the two refractories reacts with CO(g) to form SiO(g), and part of SiO(g) further reacts with CO(g) to form SiO2(s) and C(s), thus improving the oxidation resistance by densifying the structure because of the volume expansion. The reaction rate of SiC and CO(g) is slower when particle size of SiC is larger, leading to the decrease of the overflow rate of SiO(g) and the production of more SiO2(s), which can densify the structure and inhibit the oxidation of carbon in MAC refractories. The more stable composition and structure of the material is, the higher strength and the better abrasion resistance will be. Furthermore, the larger particle size of SiC decreases the contact area between the slag and the material, and then decreases the dissolution rate of MgO into slag. Therefore, the the MAC refractories containing SiC with the median size (i.e.,D50=24.58μm) have a higher corrosion resistance, compared to the MAC refractories containing SiC with the median size (i.e.,D50=4.34μm).关键词
碳化硅粒度/氧化镁-氧化铝-碳材料/精炼钢包/侵蚀机理Key words
particle size of silicon carbide/magnesium oxide-alumina-carbon refractories/refining ladle/corrosion mechanisms分类
通用工业技术引用本文复制引用
李天清,李楠,鄢文,张厚兴,贺中央,刘百宽..含不同粒度SiC的MgO-Al2O3-C材料服役状态下的侵蚀机理[J].硅酸盐学报,2017,45(12):1860-1866,7.基金项目
国家自然科学基金(51572203) （51572203）
"973"计划前期研究专项(2014CB660802)资助. （2014CB660802）
