Sintered mullite from china clay-alumina mixtures

Venkataramani, S. ; Subbarao, E. C. (1978) Sintered mullite from china clay-alumina mixtures Transactions of the Indian Ceramic Society, 37 (6). p. 225. ISSN 0371-750X

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China clay-alumina mixtures were sintered at 1400-1600°C for 2-12 h. Four different sources of alumina and a variety of mineralizers were evaluated. Mullitization from 40 to 100% takes place, depending upon the fineness of alumina, clay/alumina ratio, sintering temperature, and time and mineralizers. Finer alumina and a clay/alumina ratio of 57/43 are preferable. Transition metal oxides were generally more effective mineralizers and the optimum amount was about 1%. Porosity of the sintered products varied between 4 and 40%.

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