摘要
以板状刚玉为骨料,电熔白刚玉细粉、水合氧化铝、Si粉和Al2O3微粉为基质,通过原位氮化反应制备了Sialon结合刚玉浇注料.研究了Sialon生成量对材料的常规物理性能、高温强度和抗热震性能的影响.用X射线衍射(XRD)和扫描电子显微镜(SEM)分析了材料的物相组成和显微结构.结果表明:随Sialon生成量的增加,成型所需加水量增加,Sialon结合刚玉浇注料的常温抗折强度、体积密度下降,显气孔率略有增加,线变化率从微收缩到微膨胀;材料的高温抗折强度和抗热震性能明显提高,热震后的残余强度保持率从不含Sialon的纯刚玉浇注料的16%左右提高到50%左右.
Sialon-bonded corundum castables were prepared by in-situ nitridation sintering with tabular alumina as the aggregate,fused white corundum fine,hydratable alumina,Si powder and ultra-fine alumina as the matrix.The effects of sialon content on their physical properties,high-temperature strength and thermal shock resistance were investigated.The phase composition and microstructure of the samples were characterized by XRD and SEM.The results show that with increasing sialon content the water demand of the castables increases,the cold modulus of rupture and bulk density decrease,the apparent porosity slightly increases,and the permanent linear change varies from little shrinkage to little expansion.The hot modulus of rupture and thermal shock resistance of the castables obviously improve with increasing sialon content,and the residual strength ratio increases from 16% without sialon to 50%.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2010年第2期234-238,共5页
Journal of University of Science and Technology Beijing
基金
国家自然科学基金资助项目(No.50872125)
河南省基础与前沿技术计划资助项目(No.092300410065)
河南省教育厅自然科学基金资助项目(No.2009B430012)
关键词
SIALON
刚玉
浇注料
氮化
抗热震性
sialon
corundum
castables
nitridation
thermal shock resistance
