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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 43  1984
Development of High Alumina Refractories from Technical Alumina and Kyanite
K. K. SINGH, A. V. SUBRAMANYAM* AND M. R. K. RAo
Pages : 25-27
DOI : 10.1080/0371750X.1984.10822670
Abstract
The study aims at developing dense high alumina refractories containing 84-85% alumina with improved thermal shock resistance. The raw materials taken were raw Bayers alumina, i.e. technical grade alumina and Lapsaburu kyanite Jumps. In this work, an attempt has been made to replace the use of costly fused alumina grains by dense sintered alumina grog. Dense sintered alumina grog was prepared by adding 1 % Ti02 as a sintering aid to raw Bayers alumina followed by wet pot-milling, drying, briquetting (600 kg/em•) and sintering in a high temperature gas fired furnace at 1650°C for 5 hours. Raw kyanite Jumps were calcined at 1550°C for a soaking period of 4 hrs and then crushed, ground and graded to required sieve fractions. Cylindrical buttons of 2 dia x 2 ht (approx) and quarter size bricks (4! x 2 x 2) were fabricated in a hydraulic press at a pressure of 1000 kg/cm2 from the thoroughly prepared homogeneous mix of graded dense sintered alumina grog, calcined kyanite grains and 0.5-3.0% additions of MgF2 as mineralisers. These samples were fired at 1680° ± 20°C for a soaking period of 4 hrs and their sintering behaviour studied. Certain physicochemical and microstructural properties of fired samplt>s were determined and compared with those of similar imported products available in the market. It has been found that the properties of high alumina samples developed in this work, compared well with those of imported products.
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