添加Si粉对超低水泥结合高铝浇注料性能的影响  

Effects of Si powder additions on properties of ultra-low cement bonded bauxite based castables

作　　者：毕振勇[1] 周宁生[2] 赵静[3] 孙加林[1] 李纪伟 徐德亭 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]河南科技大学高温材料研究院,河南洛阳471003 [3]中钢集团洛阳耐火材料研究院有限公司,河南洛阳471039 [4]河南省耕生耐火材料有限公司,河南巩义451271

出　　处：《耐火材料》2012年第6期436-439,共4页Refractories

摘　　要：以高铝矾土为主要原料,在超低水泥结合的高铝浇注料中加入3%～9%(w)的Si粉,振动浇注成型试样,经烘干后,分别在空气和氮气气氛下于1 450℃热处理,研究了Si粉加入量对试样性能,尤其是1 300℃0.5 h(埋炭)高温抗折强度和荷重软化温度的影响。结果表明,在两种气氛下处理后,由Si粉反应生成的氧化物和非氧化物相均可显著提高试样的高温抗折强度和荷重软化温度,尤以氮气气氛下处理的显著,Si粉加入量为7%(w)时,氮化处理后试样的高温抗折强度可达23 MPa,是未加Si粉试样的3倍。SEM和EDAX分析表明,氮气气氛热处理后,引入的Si粉反应生成了纤维状Si3N4等非氧化物增强相,是材料高温性能得到显著提高的主要原因。综合考虑各项性能,Si粉的最佳加入量为5%～7%(w)。The high alumina based ultra-tow cement bonded castables specimens using high alumina bauxite as main starting material were prepared adding 3 mass%-9 mass% （similarly hereinafter） silicon powder and vibratory shaping. After drying,the specimens were heated at 1 450℃ in air and nitrogen atmosphere, respectively. Effects of the Si powder addition on the performance,especially the hot modulus of rupture （HMOR,1300℃ for 0. 5 h,carbon embedded） and refractoriness under load were researched. The results show that after treated in the two atmospheres,the oxides and non-oxides derived from Si powder can re- markably improve the HMOR and refractoriness under load of the specimens,especially after the nitridation treatment. The HMOR of the nitridized specimens with 7% Si powder can reach 23 MPa,2 times higher than that of the specimen without Si powder. SEM and EDAX results show that after hot treatment in N2 atmosphere, the added Si powder reacts forming non-oxide reinforcing phases,such as fiber-like Si3N4,which is the main reason of performance improvement. Overall considering,the optimizing Si powder addition is 5%-7%.

关 键 词：高铝浇注料 氮化气氛 硅 高温抗折强度 荷重软化温度 

分 类 号：TQ175.71[化学工程—硅酸盐工业]