摘要
主要研究了膨胀石墨含量对低碳铝碳耐火材料的显微结构,力学性能和抗热震性的影响;在此基础上选择合适含量的膨胀石墨引入铝锆碳质转炉挡渣闸阀中,考察了转炉挡渣闸阀的现场服役行为。结果表明:膨胀石墨引入铝碳耐火材料中有助于促进碳化硅晶须的生长;正是由于碳化硅晶须以及膨胀石墨自身的强韧化作用,铝碳耐火材料热震后的残余强度由空白样的4.87 MPa提高至9.31 MPa,残余强度保持率由38%提高至54%。工业试验结果显示引入0.5wt%膨胀石墨的铝锆碳质转炉挡渣闸阀的平均使用寿命较传统滑板提高0.77次。
The effects of contents of expanded graphite on the microstructure,mechanical properties and thermal shock resistance of low-carbon containing Al2O3-C refractories were firstly investigated.Accordingly,the field service behavior of Al2O3-C slide gates with proper content of expanded graphite addition was further evaluated.The results show that expanded graphite could stimulate the growth of Si C whiskers under high temperature.Attributing to the synergic strengthening and toughening effects of Si C whiskers and expanded graphite,the residual strength increases from 4.87 MPa to 9.31 MPa,correspondingly,the residual strength ratio varies from 38% to 54%.Also,the pilot test reveals that the average service lives of 0.5wt% expanded graphite containing Al2O3-ZrO2-C slide gates are 0.77 times longer than the traditional ones.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2018年第1期363-368,共6页
Bulletin of the Chinese Ceramic Society
关键词
转炉挡渣闸阀
膨胀石墨
力学性能
抗热震性
converter slide gate
expanded graphite
mechanical property
thermal shock resistance
