One of the important working properties of high alumina refractory bricks is the structural strength at high temperatures. This characteristic is usually evaluated by the load softening deformation temperature. Its high-temperature creep properties are also measured to reflect its high-temperature structural strength. The test results show that the load softening temperature increases with the increase of Al2O3 content.
For high-alumina refractory bricks with an Al2O3 content of less than 70%, the load softening temperature depends on the ratio between the mullite crystal phase and the liquid phase, and increases as the amount of mullite increases. The quantity and nature of the liquid phase have a significant influence on the load softening temperature. Therefore, reducing the impurity content in raw materials is beneficial to improving the load softening temperature and high temperature creep properties.
