Abstract:

The corundum castable samples with different nano-CaCO3 contents are prepared by taking tabular corundum, alumina powder, commodity calcium carbonate, Alphabond300 as main raw materials and FS10 as water reducer, and their apparent porosities, bulk densities and crushing strengths after the heat treatments at 1 000℃ and 1 600℃ are measured. The microstructures of the materials are observed with scanning electronic microscope. The result shows that when the water reducer is added in a constant amount, with the increase of nano-CaCO3 addition amount the water demand is increased gradually, apparent porosity is raised and crushing strength is heightened inch by inch. Under the condition that the basically same flow values of the castables are controlled, apparent porosity is enlarged obviously, but crushing strength is heightened gradually with the increase of the nano-CaCO3 addition amount.