Effect Of Different Binder System On Properties Of Al₂O₃-SiC-C Based Ramming Material

Blast furnace trough refractories have undergone large changes in the past ten years, due to environment, technology and economic consideration. Although the use of Al₂O₃-SiC-C ramming material in the middle and small blast furnace has seen a significant increase in our country, in the all, it is not enough to pay attention to study on ramming materials, and there is no a very higher in service life of BF trough to be invented in order to meet demands of the middle and small blast furnace.According to the present situation and damages mechanism of Al₂O₃-SiC-C ramming material, the influence of the quantity of three different binder systems, such as phenolic resin, silicon sol, the coal tar and the phenolic resin compound , upon the ramming material properties was studied in this paper. In order to make sure the optimal quantity of each binder, measure the bulk density, apparent porosity, line rate of change and strength of specimens at each heat treatment temperature. The reason and mechanism that the Al₂O₃-SiC-C ramming material possess the optimal quantity of each binder, the bulk density, apparent porosity, line rate of change and strength of specimens have been analysized and discussed by means of XRD and photos. The result indicates that the optimal quantity of silicon sol is about 8-8.5%, the proper amount of phenolic resin is about 7%, the proportion of phenolic resin and coal tar is 5:2.The experiment of the result indicates: when the phenolic resin or the coal tar and the phenolic resin compound make the binder, specimens have the high strength under the low temperature, but have the low strength due to oxidize under the high temperature. When the silicon sol makes the binder, specimens have not good strength under the low temperature, but have good sinterabilities under the high temperature. When the silicon sol makes binder, because of its high strength under the high temperature, thus it has certain use value and the application prospect.Finally, the proper amount of three different binders upon properties of Al₂O₃-SiC-C system ramming material, after heat treatment temperature, have been contrasted, taking steps to probe into their effect on properties of Al₂O₃-SiC-C system ramming material.