结合剂在碱性耐火材料中的作用

Effects of bonders on basic refractory materials

本实验以镁砂为主要原料,以硫酸镁为结合剂,以二氧化硅为辅助结合剂。骨料颗粒临界尺寸为5mm,采用连续颗粒:5～3mm、3～1mm、1～0mm、<0.074mm进行配比。保持二氧化硅微粉加入量3%,改变硫酸镁的加入量:1%、2%、3%、4%、5%。在110℃×24h、1100℃×3h和1550℃×3h烧成,研究和测测试了试样的物理性能。结果表明:硫酸镁的合适加入量为3%～4%。

In this experiment, magnesia is used as main raw materials, magnesium sulphate as the main binder, and fine silica powder as the second bind- er. The greatest size of aggregate is 5ram, and the specimens arc prepared by graduation ：5 -3mm ,3 -1 mm, 1 -0, 〈0.074ram. With the addition of fine silica powder 3% ,we adjust the amount of magnesium sulphate as：1% ,2% ,3% ,4% and 5%. The samples are sintezed at 110qCfor 24 hours, 1100T： for 3 hours and 1550℃ for 3 hours. We investigate and teste properties of the samples. The experiment shows that the appropriate addition of magnesium sul- phate is 3% -4%.