不同二氧化硅微粉对矾土基低水泥浇注料性能的影响

摘要

Effects of four kinds of microsilica with different chemical compositions and physical properties on flowabili-ty,thermal shock resistance and hot modulus of rupture were investigated. The results indicate that when microsilica with high purity,uniform and centralized particle distribution,smooth surface and good flowabili-ty is added,the castables obtain good flowability.good thermal shock resistance,and high hot modulus of rupture;nevertheless,when microsilica with high contents of carbon and alkali metal,large particle size, rough surface and poor particle dispersion,the castables obtain poor flowability,bad thermal shock resistance, and low hot modulus of rupture.%研究了4种理化性能不同的二氧化硅微粉对矾土基低水泥浇注料流动性、抗热震性和高温抗折强度的影响.结果表明:加入纯度高,杂质含量少,颗粒分布均匀、集中,表面光滑,自身流动性好的二氧化硅微粉,则浇注料的流动性好,抗热震性好,高温抗折强度高；加入碳和碱金属含量高,颗粒粒度偏粗,表面粗糙,自身分散性差的二氧化硅微粉,则浇注料流动性差,抗热震性差,高温抗折强度低.