SiO_2微粉加入量对ρ-Al_2O_3微粉结合刚玉浇注料的影响  

Effect of microsilica addition on ρ-Al_2O_3 bonded corundum castables

作　　者：贺智勇 杨粉荣 张岩 杨燕 李林 

机构地区：[1]中国钢研科技集团公司 新冶高科技集团有限公司,北京100081

出　　处：《耐火材料》2009年第2期110-112,共3页Refractories

摘　　要：在ρ-Al2O3微粉结合刚玉浇注料中分别加入2%和5%的SiO2微粉,制成40 mm×40 mm×160 mm的试样,分别经110℃24 h、1 200℃3 h和1 500℃3 h热处理后,测定试样的常温抗折强度;在上述配比的基础上去掉其中的骨料,制成15 mm×15 mm×55 mm的基质试样,分别经110℃24 h、1 200℃1 h和1 500℃1 h热处理后,采用扫描电镜分析试样的显微结构。结果表明:1)加入SiO2微粉可以显著提高ρ-Al2O3微粉结合刚玉浇注料在110℃24 h、1 200℃3 h和1 500℃3 h条件下热处理后的常温抗折强度,SiO2微粉加入量以2%(w)为佳;2)SiO2微粉水化后形成网状絮凝结构以及在中高温处理过程中SiO2微粉与ρ-Al2O3微粉反应生成莫来石,是导致含SiO2微粉的ρ-Al2O3微粉结合刚玉浇注料常温抗折强度增大的原因。The specimens were prepared using p-Al2O3 bonded corundum castables as starting material,adding into 2% and 5% microsilica, respectively, molding into 40 mm x40 mm x ldO mm,then hot-treated at 110℃ for 24 h, 1 200 ℃ for 3 h and 1 500 ℃ for 3 h respectively and the CMOR of the specimen was determined. The matrix specimens（ 15 mm× 15 mm ×55 mm） were prepared by removing coarse grains,then hot-treated at 110 ℃ for 24 h, 1 200 ℃ for 1 h and 1 500 ℃ for 1 h respectively, and the microstructure of matrix specimens was analyzed by SEM. The result showed that： （ 1 ） The microsilica obviously improved the CMOR of the specimens hot-treated at different temperatures, and the proper addition of microsilica was ：2%. （2）The hy- dration of microsilica formed netlike flocculation and microsilica reacted with p-Al2O3 and corundum forming columnar mullite（ rod-like mullite） at medium and high temperatures,which improved the CMOR of p-Al2O3 bonded corundum specimens obviously.

关 键 词：SIO2微粉 p-Al2O3微粉 刚玉浇注料 显微结构 

分 类 号：TQ175.732[化学工程—硅酸盐工业] TQ175.712