论文部分内容阅读
采用差热分析仪及XRD衍射仪确定了高炉渣纤维的玻璃化转变温度、开始析晶温度及析晶相,并在此基础上结合Matusita-sakka方程研究析晶动力学,获得析晶动力学参数。结果表明:不同升温速率条件下高炉渣纤维的玻璃化转变温度为707~721℃,开始析晶温度为847~879℃;但热处理条件下高炉渣纤维的析晶温度700℃,主要是由于不同升温速率下造成温度滞后,同时随着温度的提高及在此温度长期作用下析出的主晶相为黄长石,以及少量钙长石和透辉石。高炉渣纤维晶体的生长因子m为3,表明晶体以三维方式生长,且析晶活化能约为347.287 k J·mol-1。
Differential scanning calorimeter and XRD diffractometer were used to determine the glass transition temperature, crystallization temperature and crystallization phase of blast furnace slag fiber. On the basis of this, the kinetics of crystallization was studied by the Matusita-sakka equation to obtain the crystallization kinetics parameter. The results show that the glass transition temperature of blast furnace slag fiber is 707 ~ 721 ℃ and the initial crystallization temperature is 847 ~ 879 ℃ under different heating rates. However, the crystallization temperature of blast furnace slag at 700 ℃ is mainly due to the difference The temperature hysteresis is caused by the heating rate. At the same time, as the temperature increases and the main crystal phase precipitated at this temperature is yellowstone, and a small amount of anorthite and diopside. The growth factor m of blast furnace slag fiber is 3, indicating that the crystal grows in three dimensions and the activation energy of crystallization is about 347.287 kJ · mol-1.