MATERIALS BASED ON HIGHLY CONCENTRATED CERAMIC BINDING SUSPENSIONS (HCBS). CORUNDUM AND CORUNDUM-MULLITE CERAMIC CASTABLES BASED ON PLASTICIZED HCBS OF BAUXITE

摘要

HCBS of roasted Chinese bauxite, plasticized with additives of refractory clay, and corundum or bauxite filler are used for the production of pressed ceramic castables of corundum and mullite-corundum compositions with 93-95 percent and 80-85 percent Al_2O_3, respectively. The optimum clay additive does not exceed 1 - 2 percent. The ce-ramic castables have a porosity of 15 - 18 percent and an ultimate compressive strength of 100-200 MPa after treatment at 1200 - 1300 deg C. As compared to traditional corundum refractories they are characterized by a finer capillary structure and a higher mechanical strength attained at a diminished (by a factor of 2 - 3) press-ing pressure and a lower (by 400 - 500 deg C) firing temperature.