A brief review of recently obtained and studied ceramic binding systems and castables based on them is presented. It is shown that corundum ceramic castables (Al2O3>95%) and ceramic castables based on aluminomagnesia spinel can be produced in principle. New molding methods that employ static pressing, ramming (vibroramming), and centrifugal shaping are described. The centrifugal method was used to produce ceramic castables (d max≤5 mm) with an initial porosity of 13–14%. The method of vibroramming from molding systems with a moisture content of 3.4–4.0% was used to produce mullite-corundum ceramic castables with an elevated density and strength. The high efficiency of use of ceramic castables in metallurgy is due to the superfine porous structure of their matrix (binding) phase. The predominant pore size in various binders is 0.01–1.0 μm. In service, materials with such a structure are not impregnated by slag or metal. A principle for increasing the endurance of refractories produced from conventional raw materials using a new technology is suggested.
Refractories and Industrial Ceramics – Springer Journals
Published: Nov 27, 2007
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